Polyvinyl chloride yog abbreviated li PVC hauv lus Askiv. Nws yog ib tug polymer ntawm vinyl chloride monomer (VCM) polymerized los ntawm peroxides, azo tebchaw thiab lwm yam pib los yog nyob rau hauv qhov kev txiav txim ntawm lub teeb thiab kub raws li dawb radical polymerization cov tshuaj tiv thaiv mechanism. Vinyl chloride homopolymer thiab vinyl chloride copolymer yog sau ua ke hu ua vinyl chloride resin.
PVC yog cov hmoov dawb nrog cov qauv amorphous nrog me me ntawm cov ceg. Lub iav hloov pauv kub yog 77 ~ 90 ℃, thiab nws pib decompose nyob ib ncig ntawm 170 ℃. Nws muaj kev ruaj ntseg tsis zoo rau lub teeb thiab cua sov. Decomposition ua hydrogen chloride, uas yog ntxiv autocatalyzed thiab decomposed, ua rau discoloration, thiab lub cev thiab mechanical zog kuj poob sai heev. Hauv kev siv cov tswv yim, stabilizers yuav tsum tau ntxiv los txhim kho kev ruaj ntseg rau cov cua sov thiab lub teeb.
Qhov hnyav molecular ntawm industrially ua PVC yog feem ntau nyob rau hauv thaj tsam ntawm 50,000 mus rau 110,000. Nws muaj ib tug loj polydispersity. Qhov hnyav molecular nce nrog qhov txo qis ntawm polymerization kub. Nws tsis muaj qhov ntsuas kub ruaj khov. Nws pib mos ntawm 80-85 ° C thiab ua viscoelastic ntawm 130 ° C. , 160 ~ 180 ℃ pib hloov mus rau hauv lub xeev kua nplaum; Nws muaj cov khoom siv zoo, lub zog tensile yog li 60MPa, qhov cuam tshuam lub zog yog 5-10kJ / m2, thiab nws muaj cov khoom zoo dielectric.
PVC siv los ua lub ntiaj teb' qhov loj tshaj plaws ntawm cov khoom siv yas, thiab nws muaj ntau yam kev siv. Nws yog dav siv hauv cov khoom siv hauv tsev, cov khoom lag luam, cov khoom siv niaj hnub, cov tawv tawv hauv pem teb, cov vuas hauv pem teb, tawv tawv, cov kav dej, cov xov hlau thiab cov cables, ntim cov yeeb yaj kiab, lub raj mis, cov ntaub ntawv foaming, sealing cov ntaub ntawv, fibers, thiab lwm yam.
