Thermoplastic Elastomers (TPE) yog ib chav kawm ntawm cov ntaub ntawv polymer uas sib txuas cov elasticity ntawm roj hmab nrog kev ua tau zoo ntawm cov thermoplastics. Raws li cov qauv tshuaj thiab cov yam ntxwv ua tau zoo, TPE cov ntaub ntawv tuaj yeem muab faib ua ntau hom loj. Ntawm lawv, styrenic TPE (TPS), olefinic TPE (TPO/TPV), thiab diene-raws li TPE yog cov siv dav tshaj plaws hauv kev lag luam.
Styrenic Thermoplastic Elastomers (TPS)
Styrenic TPE, tseem hu ua TPS, yog ib qho ntawm cov tsim tawm ntxov tshaj plaws thiab feem ntau tsim cov thermoplastic elastomers. Nws yog raws li thaiv copolymer ntawm styrene nrog butadiene los yog isoprene. Cov khoom sawv cev tshaj plaws yog SBS (Styrene-Butadiene-Styrene), uas nws tus cwj pwm zoo li SBR roj hmab.
SBS tau siv dav hauv khau, qhov chaw uas nws tau hloov cov roj hmab tsoos ntau. Nws kuj tseem siv dav hauv cov ntaub ntawv roj hmab, hoses, siab-sensitive adhesives, thiab asphalt hloov kho. SBS- hloov kho asphalt txhim kho cov kab nrib pleb, kev puas tsuaj, tiv thaiv- cov khoom plam, thiab qhov kub thiab txias. Txawm hais tias SBS kuj tseem kim, nws zoo sib xws nrog asphalt ua kom muaj kev lag luam dav dav.
Cov qib hydrogenated xws li SEBS thiab SEPS ua rau muaj kev kub ntxhov, huab cua tsis kam, thiab kev laus ua haujlwm. Cov ntaub ntawv no tau siv dav los ua kev hloov pauv rau cov khoom siv hluav taws xob xws li PA thiab PC, kev kho mob- cov ntaub ntawv qib, pob tshab elastomers, thiab huab cua- tiv taus cov khoom polymer. Txawm li cas los xij, ib txwm siv SBS thiab SIS cov ntaub ntawv muaj qhov txwv tsis pub muaj cua sov, feem ntau qis dua 80 degree.
Olefinic Thermoplastic Elastomers (TPO thiab TPV)
Olefinic TPE feem ntau yog tsim los ntawm polypropylene (PP) raws li cov ntu tawv thiab EPDM roj hmab raws li ntu mos, feem ntau hu ua TPO. TPO has a low density (around 0.88), excellent weather resistance, ozone resistance, and heat resistance up to 100℃.
Txoj kev loj hlob ntawm thermoplastic vulcanizates (TPV) tau cim qhov kev ua tiav loj. TPV yog tsim los ntawm dynamic vulcanization, qhov uas tag nrho crosslinked roj hmab hais yog finely dispersed nyob rau hauv lub thermoplastic matrix. Cov qauv no txhim kho cov txheej txheem compression, roj tsis kam, thiab kev laus tiv thaiv tshav kub, tso cai rau TPV kom ua tiav qib kev ua tau zoo piv rau CR roj hmab.
TPV yog dav siv nyob rau hauv tsheb ntsaws ruaj ruaj, hoses, hlau thiab cable rwb thaiv tsev, cua ducts, gaskets, thiab lub tsev sealing systems, thiab tau loj hloov ib txwm roj hmab nyob rau hauv ntau daim ntawv thov. Tam sim no, TPO suav txog kwv yees li 80-85% ntawm olefinic TPE noj, thaum TPV sawv cev rau 15-20%, nrog rau kev loj hlob sai.
Diene-Raws li Thermoplastic Elastomers
Diene-raws li TPE feem ntau suav nrog cov thermoplastic trans-polyisoprene (TPI) thiab thermoplastic polybutadiene (TPB). TPI yog structurally zoo ib yam li tej yam ntuj tso gutta-percha thiab nthuav qhia siab crystallinity, zoo mechanical zog, thiab zoo li lub cim xeeb zog. Nws yog siv rau hauv cov khoom siv orthopedic, cov cuab yeej tiv thaiv kev ua kis las, thiab cov yeeb yaj kiab tshwj xeeb.
TPB muaj cov pob tshab zoo heev, huab cua tsis kam, hluav taws xob rwb thaiv tsev, thiab tswj kev degradability. Ib qho txiaj ntsig tseem ceeb ntawm diene-raws li TPE yog tias nws tuaj yeem ua vulcanized, txhim kho qhov kub thiab txias, roj tsis kam, thiab kav ntev -ib lub peev xwm uas feem ntau TPE cov ntaub ntawv tsis muaj.