{"id":5820,"date":"2022-12-30T10:40:43","date_gmt":"2022-12-30T10:40:43","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=5820"},"modified":"2026-08-25T08:50:57","modified_gmt":"2026-08-25T08:50:57","slug":"classification-and-mechanism-of-polymerization-inhibitors","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/hu\/classification-and-mechanism-of-polymerization-inhibitors\/","title":{"rendered":"Polymerization Inhibitors: Types, Mechanisms & Selection"},"content":{"rendered":"

Gyors v\u00e1lasz:<\/strong> Polymerization inhibitors suppress unwanted radical or ionic reactions during storage, purification and processing. Selection depends on monomer chemistry, oxygen availability, temperature, residence time and the downstream removal requirement.<\/p>\n

A monomerek szabad gy\u00f6k\u00f6s polimeriz\u00e1ci\u00f3ja a t\u00e1rol\u00e1si vagy feldolgoz\u00e1si \u00e9s tiszt\u00edt\u00e1si folyamatban, gyakran a f\u00e9ny, a h\u0151 \u00e9s m\u00e1s t\u00e9nyez\u0151k \u00e9s a polimeriz\u00e1ci\u00f3 szerepe miatt, kis mennyis\u00e9g\u0171 polimeriz\u00e1ci\u00f3s inhibitor hozz\u00e1ad\u00e1s\u00e1val elker\u00fclhet\u0151 ez a puszt\u00edt\u00f3 reakci\u00f3. A polimeriz\u00e1ci\u00f3s folyamatban, n\u00e9h\u00e1ny monomer polimeriz\u00e1ci\u00f3 egy bizonyos konverzi\u00f3s ar\u00e1ny ut\u00e1n meg kell \u00e1ll\u00edtani, vagy hajlamos a polimeriz\u00e1ci\u00f3 kit\u00f6r\u00e9s\u00e9re, am\u00edg a polimeriz\u00e1ci\u00f3s inhibitorok id\u0151ben t\u00f6rt\u00e9n\u0151 hozz\u00e1ad\u00e1sa, hamarosan v\u00e9get \u00e9rhet vagy le\u00e1ll\u00edthatja a reakci\u00f3t. A polimeriz\u00e1ci\u00f3s inhibitorok els\u0151dleges gy\u00f6k\u00f6k vagy l\u00e1ncgy\u00f6k\u00f6k stabil molekul\u00e1kk\u00e1 vagy nagyon alacsony aktivit\u00e1s kialakul\u00e1sa nem elegend\u0151 ahhoz, hogy folytassa a polimeriz\u00e1ci\u00f3s reakci\u00f3t egy stabil radik\u00e1lis oszt\u00e1ly\u00fa anyagok oszt\u00e1lya. Ezen t\u00falmen\u0151en, az ionos polimeriz\u00e1ci\u00f3s folyamat n\u00e9ha annak \u00e9rdek\u00e9ben, hogy megsz\u00fcntesse a reakci\u00f3t, vagy hogy a reakci\u00f3 prepolimer stabilit\u00e1s, n\u00e9ha hozz\u00e1 n\u00e9h\u00e1ny savas vagy l\u00fagos vegy\u00fcletek, mint egy blokkol\u00f3 szer, \u00e1ltal\u00e1ban nevezik stabiliz\u00e1torok, mivel a t\u00edpus \u00e9s a teljes\u00edtm\u00e9ny egyszer\u0171, \u00e1ltal\u00e1ban nem t\u00e1rgyalt.<\/p>\n

A polimeriz\u00e1ci\u00f3s folyamat monomer a t\u00e1rol\u00e1s, sz\u00e1ll\u00edt\u00e1s gyakran adunk a polimeriz\u00e1ci\u00f3s indukci\u00f3s id\u0151szak (azaz a polimeriz\u00e1ci\u00f3s sebess\u00e9g nulla egy ideig), a hossza az indukci\u00f3s id\u0151szak ar\u00e1nyos a tartalom a polimeriz\u00e1ci\u00f3s inhibitor, miut\u00e1n a fogyaszt\u00e1s a polimeriz\u00e1ci\u00f3s inhibitor, a v\u00e9g\u00e9n az indukci\u00f3s id\u0151szak, azaz a norm\u00e1l sebess\u00e9g szerint a jelenl\u00e9te nem polimeriz\u00e1ci\u00f3s inhibitor. Ez\u00e9rt a polimeriz\u00e1ci\u00f3s inhibitort a monomer felhaszn\u00e1l\u00e1sa el\u0151tt el kell t\u00e1vol\u00edtani. \u00c1ltal\u00e1ban a polimeriz\u00e1ci\u00f3s inhibitor egy szil\u00e1rd anyag, amely kev\u00e9s ill\u00e9konys\u00e1ggal rendelkezik, \u00edgy a monomer desztill\u00e1ci\u00f3ja sor\u00e1n elt\u00e1vol\u00edthat\u00f3. A hidrokinon polimeriz\u00e1ci\u00f3j\u00e1nak \u00e1ltal\u00e1nosan haszn\u00e1lt ellen\u00e1ll\u00e1sa n\u00e1trium-hidroxiddal reag\u00e1lhat, hogy v\u00edzben old\u00f3d\u00f3 n\u00e1triums\u00f3t hozzon l\u00e9tre, \u00edgy 5% - 10% n\u00e1trium-hidroxid oldattal t\u00f6rt\u00e9n\u0151 mos\u00e1ssal elt\u00e1vol\u00edthat\u00f3. A r\u00e9z-klorid \u00e9s a vas-klorid \u00e9s m\u00e1s szervetlen polimeriz\u00e1ci\u00f3s inhibitorok szint\u00e9n elt\u00e1vol\u00edthat\u00f3k savas mos\u00e1ssal.<\/p>\n

Az \u00e1ltal\u00e1nosan haszn\u00e1lt polimeriz\u00e1ci\u00f3s inhibitorok oszt\u00e1lyoz\u00e1sa \u00e9s mechanizmusa a k\u00f6vetkez\u0151.<\/p>\n

(1) polifenolok polimeriz\u00e1ci\u00f3s inhibitor polifenolok \u00e9s helyettes\u00edtett fenolok egy oszt\u00e1lya sz\u00e9les k\u00f6rben haszn\u00e1lt, a hat\u00e1sa egy j\u00f3 polimeriz\u00e1ci\u00f3s inhibitor, de fel kell oldani a monomer, ha van oxig\u00e9n, hogy megmutassa a blokkol\u00f3 hat\u00e1s. A polimeriz\u00e1ci\u00f3 mechanizmusa a fenol oxid\u00e1l\u00f3dik a megfelel\u0151 kinon \u00e9s a l\u00e1nc a szabad gy\u00f6k\u00f6k kombin\u00e1lt szerep\u00e9t j\u00e1tszani a polimeriz\u00e1ci\u00f3. Fenolos inhibitorok jelenl\u00e9t\u00e9ben a peroxid gy\u00f6k\u00f6k gyorsan megsz\u0171nnek, hogy elegend\u0151 oxig\u00e9n legyen a monomerben a polimeriz\u00e1ci\u00f3s id\u0151szak meghosszabb\u00edt\u00e1s\u00e1hoz. Sz\u00e1mos k\u00eds\u00e9rleti eredm\u00e9ny bizony\u00edtotta, hogy a fenolok g\u00e1tl\u00f3 hat\u00e1sa val\u00f3j\u00e1ban antioxid\u00e1ns hat\u00e1s, \u00e9s g\u00e1tl\u00f3 hat\u00e1suk molekul\u00e1ris szerkezet\u00fckkel \u00e9s tulajdons\u00e1gaikkal f\u00fcgg \u00f6ssze, \u00edgy a kinonszer\u0171 szerkezet\u0171v\u00e9 k\u00f6nnyen oxid\u00e1l\u00f3d\u00f3 fenolok, mint p\u00e9ld\u00e1ul a hidrokinon, nagy reakci\u00f3k\u00e9pess\u00e9ggel rendelkeznek a peroxilgy\u00f6k\u00f6kkel \u00e9s nagy g\u00e1tl\u00f3 hat\u00e1ssal. Ha a benzolgy\u0171r\u0171 elektronelnyel\u0151 csoporttal rendelkezik, a peroxi gy\u00f6kkel val\u00f3 reakci\u00f3aktivit\u00e1s alacsony, \u00e9s a g\u00e1tl\u00f3 aktivit\u00e1s is alacsony; ezzel szemben a tol\u00f3 elektroncsoporttal a peroxi gy\u00f6kkel val\u00f3 reakci\u00f3aktivit\u00e1s magas, \u00e9s a g\u00e1tl\u00f3 aktivit\u00e1s is er\u0151s. Gyakran haszn\u00e1lt fajok a hidrokinon, p-tert-butil-katechol, 2,6-di-terc-butil-p-metilfenol, 4,4\u2032-di-terc-butil-bifenil \u00e9s biszfenol A stb.<\/p>\n

(2) kinon polimeriz\u00e1ci\u00f3s inhibitorok kinon polimeriz\u00e1ci\u00f3s inhibitorok \u00e1ltal\u00e1nosan haszn\u00e1lt molekul\u00e1ris polimeriz\u00e1ci\u00f3s inhibitorok, a 0,01%-0,1% mennyis\u00e9ge k\u00e9pes lesz el\u00e9rni a v\u00e1rt polimeriz\u00e1ci\u00f3s blokkol\u00f3 hat\u00e1st, de a k\u00fcl\u00f6nb\u00f6z\u0151 monomer blokkol\u00f3 hat\u00e1sa elt\u00e9r\u0151. A benzokinonhoz a sztirol, a vinil-acet\u00e1t hat\u00e9kony polimeriz\u00e1ci\u00f3s inhibitor, de a metil-akril\u00e1t \u00e9s a metil-metakril\u00e1t csak a lass\u00fa polimeriz\u00e1ci\u00f3ban j\u00e1tszik szerepet. A kinon blokkol\u00e1s\u00e1nak mechanizmusa nem teljesen tiszt\u00e1zott, lehet, hogy a kinon \u00e9s a gy\u00f6k\u00f6k add\u00edci\u00f3s vagy disproporci\u00f3s reakci\u00f3kat v\u00e9geznek, hogy kinon t\u00edpus\u00fa vagy f\u00e9lkinon t\u00edpus\u00fa gy\u00f6k\u00f6ket hozzanak l\u00e9tre, majd reakt\u00edv gy\u00f6k\u00f6kkel egyes\u00fclve inakt\u00edv term\u00e9keket kapnak, amelyek szerepet j\u00e1tszanak a polimeriz\u00e1ci\u00f3 blokkol\u00e1s\u00e1ban. A kinon aggreg\u00e1ci\u00f3t g\u00e1tl\u00f3 k\u00e9pess\u00e9ge a kinon szerkezet\u00e9vel \u00e9s a monomer term\u00e9szet\u00e9vel is \u00f6sszef\u00fcgg. A kinonmag elektrofil tulajdons\u00e1gokkal rendelkezik, \u00e9s a kinongy\u0171r\u0171n l\u00e9v\u0151 szubsztituensek hat\u00e1ssal vannak az elektrofilit\u00e1sra, ami a helyblokkol\u00f3 hat\u00e1ssal egy\u00fctt a keton blokkol\u00f3 hat\u00e9konys\u00e1g\u00e1nak k\u00fcl\u00f6nbs\u00e9g\u00e9t eredm\u00e9nyezi. A p-benzokinon molekul\u00e1nk\u00e9nt termin\u00e1lhat\u00f3 gy\u00f6k\u00f6k sz\u00e1ma nagyobb, mint 1, s\u0151t ak\u00e1r 2. A tetrakl\u00f3r-benzokinon \u00e9s az 1,4-naftokinon sztirolt tartalmaz\u00f3 tel\u00edtetlen poli\u00e9sztergyant\u00e1khoz adva j\u00f3 szerepet j\u00e1tszanak a polimeriz\u00e1ci\u00f3 blokkol\u00e1s\u00e1ban \u00e9s jav\u00edtj\u00e1k a t\u00e1rol\u00e1si stabilit\u00e1st. A tetrakl\u00f3r-benzokinon hat\u00e9kony polimeriz\u00e1ci\u00f3s inhibitor a vinil-acet\u00e1t eset\u00e9ben, de nincs polimeriz\u00e1ci\u00f3s g\u00e1tl\u00f3 hat\u00e1sa az akrilnitrilre.<\/p>\n

(3) arom\u00e1s amin polimeriz\u00e1ci\u00f3s inhibitorok arom\u00e1s amin polimeriz\u00e1ci\u00f3s inhibitorok mind alk\u00e9n monomer inhibitorok, hanem polimer anyagok, antioxid\u00e1ns \u00f6reg\u00edt\u0151 szer. Az arom\u00e1s aminvegy\u00fcletek nem olyan hat\u00e9konyak a polimeriz\u00e1ci\u00f3 g\u00e1tl\u00e1s\u00e1ban, mint a fenolok, csak a vinil-acet\u00e1t, izopr\u00e9n, butadi\u00e9n, sztirol eset\u00e9ben, de nincs g\u00e1tl\u00f3 hat\u00e1suk az akril\u00e1tokra \u00e9s metakril\u00e1tokra. A nitrobenzol polimeriz\u00e1ci\u00f3g\u00e1tl\u00f3k\u00e9nt hat az\u00e1ltal, hogy a szabad gy\u00f6k\u00f6kkel stabil nitroxidgy\u00f6k\u00f6ket hoz l\u00e9tre. Az arom\u00e1s aminok \u00e9s a fenolok polimeriz\u00e1ci\u00f3s mechanizmusa hasonl\u00f3, \u00e9s egyes monomerek eset\u00e9ben a kett\u0151 bizonyos ar\u00e1nyban t\u00f6rt\u00e9n\u0151 haszn\u00e1lata jobb hat\u00e1ssal van a polimeriz\u00e1ci\u00f3ra, mint az egyszeri haszn\u00e1lat. P\u00e9ld\u00e1ul hidrokinon \u00e9s difenilamin keverve, vagy tert-butil-katechin \u00e9s fenotiazin keverve, a polimeriz\u00e1ci\u00f3 hat\u00e1sa, mint b\u00e1rmelyik\u00e9 \u00f6nmag\u00e1ban, ha a hat\u00e1s 300-szoros\u00e1ra n\u0151. Az arom\u00e1s amin-polimeriz\u00e1ci\u00f3s inhibitorok blokkol\u00f3 aktivit\u00e1sa a molekul\u00e1ris szubsztituensek jelleg\u00e9vel f\u00fcgg \u00f6ssze, \u00e9s az anilin blokkol\u00f3 aktivit\u00e1sa fokoz\u00f3dik, ha a para-poz\u00edci\u00f3ban elektronnyom\u00f3 csoportot tartalmaz. Ha az aminocsoportban l\u00e9v\u0151 hidrog\u00e9nt metilre cser\u00e9lj\u00fck, a blokkol\u00f3 aktivit\u00e1s jelent\u0151sen cs\u00f6kken. Az anilin eset\u00e9ben az 1-es helyzetben az aminocsoport aktivit\u00e1sa nagyobb, mint a 2-es helyzetben, \u00e9s az aktivit\u00e1s t\u00f6bb aminocsoporttal n\u0151, \u00e9s jelent\u0151sen cs\u00f6kken, ha a naftalingy\u0171r\u0171 elektronelnyel\u0151 csoportot hordoz. A p-fenil\u00e9ndiamin aminocsoportj\u00e1n l\u00e9v\u0151 hidrog\u00e9nt alkil-, arilsz\u00e1rmaz\u00e9kokkal helyettes\u00edtik, a blokkol\u00f3 aktivit\u00e1s magasabb. Az \u00e1ltal\u00e1nosan haszn\u00e1lt aril-amin polimeriz\u00e1ci\u00f3s inhibitorok k\u00f6z\u00e9 tartozik a p-toluidin, a difenil-amin, a benzidin, a p-fenil\u00e9ndiamin, az N-nitrozodifenil-amin stb.<\/p>\n

(4) Szabad gy\u00f6k\u00f6s polimeriz\u00e1ci\u00f3g\u00e1tl\u00f3 Az 1,1-difenil-2-trinitrofenil-fenilhidrazin tipikus szabad gy\u00f6k\u00f6s t\u00edpus\u00fa polimeriz\u00e1ci\u00f3s inhibitor. Az er\u0151s konjug\u00e1lt stabiliz\u00e1ci\u00f3 \u00e9s a hatalmas t\u00e9rbeli hely\u00e1ll\u00f3s\u00e1g miatt ez a vegy\u00fclet szabad gy\u00f6k\u00f6k form\u00e1j\u00e1ban l\u00e9tezhet, amely \u00f6nmag\u00e1ban nem tud dimeriz\u00e1l\u00f3dni \u00e9s nem tud monomereket kezdem\u00e9nyezni, de k\u00e9pes csapd\u00e1ba ejteni az akt\u00edv gy\u00f6k\u00f6ket, ami ide\u00e1lis polimeriz\u00e1ci\u00f3s inhibitor. B\u00e1r a szabadgy\u00f6k-t\u00edpus\u00fa polimeriz\u00e1ci\u00f3s inhibitor blokkol\u00f3 hat\u00e1sa kiv\u00e1l\u00f3, de az el\u0151k\u00e9sz\u00edt\u00e9s neh\u00e9z, dr\u00e1ga, a monomer finom\u00edt\u00e1sa, t\u00e1rol\u00e1sa \u00e9s sz\u00e1ll\u00edt\u00e1sa, a polimeriz\u00e1ci\u00f3 megsz\u00fcntet\u00e9se kev\u00e9sb\u00e9 haszn\u00e1lj\u00e1k ezt az inhibitort, korl\u00e1toz\u00f3dik a kezdem\u00e9nyez\u00e9si sebess\u00e9g meghat\u00e1roz\u00e1s\u00e1ra.<\/p>\n

(5) szervetlen vegy\u00fcletek polimeriz\u00e1ci\u00f3s inhibitor szervetlen s\u00f3k r\u00e9v\u00e9n t\u00f6lt\u00e9s\u00e1tvitel \u00e9s a szerepe a polimeriz\u00e1ci\u00f3, vas-klorid polimeriz\u00e1ci\u00f3 blokkol\u00f3 hat\u00e9konys\u00e1g\u00e1t, \u00e9s lehet kik\u00fcsz\u00f6b\u00f6lni a k\u00e9miai d\u00f3zis 1,1 szabad gy\u00f6k\u00f6k. A n\u00e1trium-szulf\u00e1t, n\u00e1trium-szulfid, amm\u00f3nium-tiocian\u00e1t vizes f\u00e1zis\u00fa polimeriz\u00e1ci\u00f3s inhibitork\u00e9nt haszn\u00e1lhat\u00f3. A n\u00e1trium-szulfid, a n\u00e1trium-ditiokarbam\u00e1t \u00e9s a metil\u00e9nk\u00e9k \u00e9s m\u00e1s nitrog\u00e9n-, k\u00e9nvegy\u00fcletek egyes monomerekben szint\u00e9n hat\u00e9kony polimeriz\u00e1ci\u00f3s g\u00e1tl\u00f3 hat\u00e1ssal rendelkeznek. A v\u00e1ltoz\u00f3 valenci\u00e1j\u00fa \u00e1tmeneti f\u00e9ms\u00f3knak egyes monomerekn\u00e9l polimeriz\u00e1ci\u00f3g\u00e1tl\u00f3 hat\u00e1suk van, mert ezek az anyagok az akt\u00edv l\u00e1nc elektron\u00e1tad\u00e1ssal t\u00f6rt\u00e9n\u0151 megszak\u00edt\u00e1s\u00e1val megsz\u00fcntethetik a polimeriz\u00e1ci\u00f3s reakci\u00f3t. M\u00e1s vegy\u00fcletek, p\u00e9ld\u00e1ul a r\u00e9zoxid, a kobalt-metakril\u00e1t stb. j\u00f3 polimeriz\u00e1ci\u00f3s blokkol\u00f3 hat\u00e1ssal rendelkeznek.<\/p>\n

A polimeriz\u00e1ci\u00f3s inhibitor kiv\u00e1laszt\u00e1s\u00e1hoz els\u0151sorban magas polimeriz\u00e1ci\u00f3s blokkol\u00e1si hat\u00e9konys\u00e1gra van sz\u00fcks\u00e9g, figyelembe kell venni a monomerben val\u00f3 oldhat\u00f3s\u00e1g\u00e1t \u00e9s a monomer alkalmazkod\u00f3k\u00e9pess\u00e9g\u00e9t, k\u00f6nnyen elt\u00e1vol\u00edthat\u00f3 a monomerb\u0151l desztill\u00e1ci\u00f3val vagy a polimeriz\u00e1ci\u00f3s inhibitor k\u00e9miai m\u00f3dszer\u00e9vel. A legjobb, ha olyan polimeriz\u00e1ci\u00f3s inhibitort v\u00e1lasztunk, amely szobah\u0151m\u00e9rs\u00e9kleten blokkol\u00f3k\u00e9nt k\u00e9pes m\u0171k\u00f6dni, \u00e9s reakci\u00f3h\u0151m\u00e9rs\u00e9kleten gyorsan lebomlik, \u00edgy elt\u00e1vol\u00edthat\u00f3 a monomerb\u0151l a bajok cs\u00f6kkent\u00e9se \u00e9s a zavartalan polimeriz\u00e1ci\u00f3s reakci\u00f3 biztos\u00edt\u00e1sa \u00e9rdek\u00e9ben.<\/p>\n

\u2460A monomerrel \u00e9s a gyant\u00e1val val\u00f3 keverhet\u0151s\u00e9g j\u00f3, csak az elegyed\u00e9s j\u00e1tszhat szerepet a polimeriz\u00e1ci\u00f3ban.<\/p>\n

\u2461 Hat\u00e9konyan megakad\u00e1lyozhatja a polimeriz\u00e1ci\u00f3s reakci\u00f3 el\u0151fordul\u00e1s\u00e1t, \u00edgy a monomer, a gyanta, az emulzi\u00f3 vagy a ragaszt\u00f3 elegend\u0151 t\u00e1rol\u00e1si id\u0151vel rendelkezik.<\/p>\n

\u2462A monomerben l\u00e9v\u0151 polimeriz\u00e1ci\u00f3s inhibitor k\u00f6nnyen elt\u00e1vol\u00edthat\u00f3 vagy nem befoly\u00e1solja a polimeriz\u00e1ci\u00f3s aktivit\u00e1st. A legjobb, ha a hat\u00e9kony polimeriz\u00e1ci\u00f3s inhibitort szobah\u0151m\u00e9rs\u00e9kleten v\u00e1lasztjuk ki, \u00e9s megfelel\u0151en magas h\u0151m\u00e9rs\u00e9kleten, hogy a polimeriz\u00e1ci\u00f3s inhibitort elvesz\u00edtse, \u00edgy az inhibitort nem kell elt\u00e1vol\u00edtani a felhaszn\u00e1l\u00e1s el\u0151tt. P\u00e9ld\u00e1ul a tert-butil-katechol, p-fenol-monobutil-\u00e9ter ilyen t\u00edpus\u00fa polimeriz\u00e1ci\u00f3s inhibitor.<\/p>\n

\u2463 nem befoly\u00e1solja a ragaszt\u00f3k \u00e9s t\u00f6m\u00edt\u0151anyagok fizikai \u00e9s mechanikai tulajdons\u00e1gait. Polimer inhibitor a ragaszt\u00f3k el\u0151\u00e1ll\u00edt\u00e1sa sor\u00e1n az oxid\u00e1ci\u00f3 folyamat\u00e1ban a magas h\u0151m\u00e9rs\u00e9klet elsz\u00ednez\u0151d\u00e9s miatt, \u00e9s befoly\u00e1solja a term\u00e9k megjelen\u00e9s\u00e9t.<\/p>\n

\u2464 t\u00f6bb inhibitor egy\u00fcttesen alkalmazva jelent\u0151sen jav\u00edthatja a polimeriz\u00e1ci\u00f3 hat\u00e1s\u00e1t. P\u00e9ld\u00e1ul tel\u00edtetlen poli\u00e9szter gyanta hidrokinon, tert-butil-katechol \u00e9s r\u00e9z-naft\u00e9n\u00e1t 3 f\u00e9le inhibitorok, hidrokinon aktivit\u00e1s a leger\u0151sebb, a keverhet\u0151 sztirol \u00e9s poli\u00e9szter ellen\u00e1ll magas h\u0151m\u00e9rs\u00e9kleten k\u00f6r\u00fclbel\u00fcl 130 \u2103, 1 perc alatt kopolimeriz\u00e1ci\u00f3 n\u00e9lk\u00fcl, lehet biztons\u00e1gosan kevert h\u00edg\u00edt\u00e1s. A terc-butil-katechol magas h\u0151m\u00e9rs\u00e9kleten gyenge, de valamivel alacsonyabb h\u0151m\u00e9rs\u00e9kleten (p\u00e9ld\u00e1ul 60 \u2103) a blokkol\u00f3 hat\u00e1sa 25-sz\u00f6r nagyobb, mint a hidrokinon\u00e9, \u00e9s hosszabb t\u00e1rol\u00e1si id\u0151vel rendelkezhet. A r\u00e9z-naft\u00e9n\u00e1t szobah\u0151m\u00e9rs\u00e9kleten blokkol\u00f3k\u00e9nt, magas h\u0151m\u00e9rs\u00e9kleten pedig prom\u00f3terk\u00e9nt hat: p\u00e9ld\u00e1ul oxig\u00e9n jelenl\u00e9t\u00e9ben is. A tert-butil-katechol \u00e9s fenotiazin, hidrokinon \u00e9s difenil-amin vegyes alkalmaz\u00e1sa eset\u00e9n a blokkol\u00f3 hat\u00e1s k\u00f6r\u00fclbel\u00fcl 300-szor nagyobb, mint b\u00e1rmelyik\u00fck\u00e9 \u00f6nmag\u00e1ban.<\/p>\n

P\u00e9ld\u00e1ul a j\u00f3d 10-4 mol\/l koncentr\u00e1ci\u00f3ban hat\u00e9kony polimeriz\u00e1ci\u00f3s inhibitor, de enn\u00e9l nagyobb mennyis\u00e9gben polimeriz\u00e1ci\u00f3s reakci\u00f3kat ind\u00edthat el. A j\u00f3dot \u00e1ltal\u00e1ban nem haszn\u00e1lj\u00e1k \u00f6nmag\u00e1ban, hanem kis mennyis\u00e9g\u0171 k\u00e1lium-jodidot kell hozz\u00e1adni az oldhat\u00f3s\u00e1g n\u00f6vel\u00e9se \u00e9s a polimeriz\u00e1ci\u00f3g\u00e1tl\u00e1s hat\u00e9konys\u00e1g\u00e1nak jav\u00edt\u00e1sa \u00e9rdek\u00e9ben.<\/p>\n

(7) Nem m\u00e9rgez\u0151, \u00e1rtalmatlan, nincs k\u00f6rnyezetszennyez\u00e9s.<\/p>\n

\u2467 Stabil teljes\u00edtm\u00e9ny, olcs\u00f3 \u00e9s k\u00f6nnyen beszerezhet\u0151.<\/p>\n

Use a documented inhibitor as a controlled reference<\/h2>\n

A CHLUMINIT\u00ae 701 \/ 4-Hydroxy-TEMPO inhibitor<\/a> page provides a relevant product reference for radical-polymerization control. Request current purity, dosage and process guidance; oxygen dependence and removal requirements must be validated in the actual monomer and process.<\/p>\n

L\u00e9pjen kapcsolatba vel\u00fcnk most!<\/b><\/strong><\/h2>\n

Ha COA, MSDS vagy TDS-re van sz\u00fcks\u00e9ge, k\u00e9rj\u00fck, t\u00f6ltse ki el\u00e9rhet\u0151s\u00e9g\u00e9t az al\u00e1bbi \u0171rlapon, \u00e1ltal\u00e1ban 24 \u00f3r\u00e1n bel\u00fcl felvessz\u00fck \u00d6nnel a kapcsolatot. \u00d6n is k\u00fcldhet nekem e-mailt info@longchangchemical.com<\/a><\/span> munkaid\u0151ben ( 8:30-18:00 UTC+8 H.-Szombat ) vagy haszn\u00e1lja a weboldal \u00e9l\u0151 chatj\u00e9t, hogy azonnali v\u00e1laszt kapjon.<\/b><\/strong><\/h4>","protected":false},"excerpt":{"rendered":"

Free radical polymerization of monomers in the storage or processing and purification process, often due to the role of light, heat and other factors and polymerization, adding a small amount<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[114],"tags":[],"class_list":["post-5820","post","type-post","status-publish","format-standard","hentry","category-catalysts-chemical-auxiliary-agents"],"yoast_head":"\nPolymerization Inhibitors: Types, Mechanisms & Selection<\/title>\n<meta name=\"description\" content=\"Understand polymerization inhibitor types and mechanisms, then choose storage or process control by monomer chemistry, oxygen, temperature and residence time.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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