Dab tsi yog cov khoom tseem ceeb ntawm ppr tube
PPR ( polypropylene random ), tseem hu ua random copolymer polypropylene (PPR), muaj cov tawv zoo, muaj lub zog loj, zoo txheej txheem, zoo nkag siab ntawm qhov kub siab dua, thiab muaj qhov tshwj xeeb siab ntawm random copolymer polypropylene qhov zoo, tuaj yeem siv dav hauv kev tsim cov kav dej, cov nplooj ntawv, txhua txhua hnub, kev ntim khoom, khoom siv hauv tsev thiab ntau yam zaj duab xis. Lub npe lus Askiv ntawm PP-R yog polypropylene random (copolymer). PP-R yog qhov luv ntawm polypropylene random copolymer. Nws kuj yog siv los xa mus rau cov khoom siv thauj khoom tshwj xeeb rau cov kav dej txias thiab dej kub. PP-R yeeb kuj tseem hu ua hom III polypropylene yeeb nkab, random copolymerized polypropylene. Random copolymerized polypropylene tuaj yeem txuas ntxiv rau hauv cov kav dej. PP random copolymer feem ntau muaj li 1 txog 7% los ntawm qhov hnyav ntawm ethylene lwg me me thiab 99-93% los ntawm qhov hnyav ntawm propylene lwg me me. Ntawm cov saw hlau polymer, cov roj ntsha ntawm ethylene sib sau ua ke ntawm cov txheej txheem propylene lwg me me. Hauv no random lossis cov ntaub ntawv luam tawm ua haujlwm, feem ntau (feem ntau 75%) ntawm ethylene yog sib xyaw los ntawm ib hom ntxig molecular, uas yog hu ua X3 pab pawg (peb sib law liag ethylene [CH2] yog teem rau hauv kev txiav txim hauv lub ntsiab {TodayHot} saw), qhov no tuaj yeem kuj pom raws li kev pom zoo ntawm cov roj ntsha ntawm cov roj ntsha ntawm cov roj ob ntawm cov roj propylene. Lwm 25% ntawm ethylene tau muab tso rau hauv cov saw tseem ceeb los ntawm cov ntxig sib xyaw nrog ntau pawg, tseem hu ua X5 pab pawg, vim tias muaj 5 methylene pawg sib law liag (ob hom ethylene lwg me me tau muab tso ua ke ntawm ob pawg ntawm cov roj molecules). Nws yog qhov nyuaj kom paub qhov txawv X5 ntawm cov pab pawg siab xws li X7, X9, thiab lwm yam Hauv kev pom ntawm qhov no, XS thiab cov ntsiab lus ethylene ntawm cov pawg siab dua tau suav ua ke li> X3%. Random feem piv X3 / X5 tuaj yeem ntsuas tau. Thaum qhov feem pua ntawm cov pawg saum toj X3 yog qhov loj, crystallinity ntawm tus kws luam ntawv yuav raug txo kom tsawg, uas yuav cuam tshuam zoo rau qhov kev ua tiav kawg ntawm cov ntawv luam (copolymer). Cov nyhuv ntawm cov theem siab ntawm ethylene hauv lub tshuab copolymer rau ntawm crystallinity ntawm cov polymer yog zoo li cov nyhuv ntawm theem siab polypropylene ntau. Random PP copolymer yog qhov txawv ntawm homopolymers vim tias lub ethylene lwg me me nkag mus rau hauv cov pob txha polymer rov qab tab tom cuam tshuam kev ua tiav crystalline ntawm cov polymer molecules. Qhov qis dua ntawm copolymer crystallinity ua rau muaj kev hloov pauv ntawm cov khoom siv lub cev: random copolymer muaj qis qis qis dua, txhim kho muaj zog cuam tshuam, thiab zoo dua daim phiaj dua PP homopolymers. Ethylene copolymer tseem muaj qis dua kub txias, uas yog qhov zoo dua thaum lawv siv qee cov ntawv thov. Random copolymer muaj ntau cov tawv extractables thiab random PP, nrog rau cov saw hlau txuas nrog cov ntsiab lus ntau ethylene. Cov ntsiab lus siab dua ntawm cov tawv tawv, nyob ntawm cov txheej txheem polymerization, yog tam sim no nyob rau hauv tag nrho cov khoom lag luam copolymer kom sib txawv qib thiab yog tshwm sim los ntawm kev ua raws li Tsoom Fwv Tswj Khoom Noj Txoj Cai (HotTag) cov cai rau kev sib cuag zaub mov nyuaj.
