petg
Li-copolymers
Ntle le bohloeki (homopolymer) PET, PET e fetotsoe ke kopolymerization e fumaneha hape.
Maemong a mang, thepa e fetotsoeng ea Copolymer e lakatseha haholoanyane ts'ebeliso e itseng. Ka mohlala, cyclohexane dimethanol (CHDM) e ka eketsoa mokokotlong oa polymer sebakeng sa ethylene glycol. Kaha moaho ona o moholo haholo (liathomo tse ling tse 6 tsa khabone) ho feta yuniti ea ethylene glycol eo oe nkang sebaka, ha e lumellane le liketane tsa boahelani ka tsela eo yuniti ea ethylene glycol e neng e ka etsa ka eona. Sena se kena-kenana le crystallization mme se theola mocheso o qhibilihang oa polymer. Ka kakaretso, PET e joalo e tsejoa e le PETG kapa PET-G (Polyethylene terephthalate glycol-modified; Eastman Chemical, SK Chemicals, le Artenius Italia ke baetsi ba PETG). PETG ke thermoplastic e hlakileng e ka ba ente e entsoeng ka ente kapa lakane e fetisitsoeng. E ka mebala nakong ea ts'ebetso.
Mofuta o mong o tloaelehileng ke isophthalic asiti, e nkela tse ling tsa 1,4- (serapa sa) kopantsoe terephthalate diyuniti. The 1,2- (ortho-) kapa 1,3- (pakane ea bona-) khokahano e hlahisa sekhutlo ho ketane, le eona e ferekanyang kristale.
Li-Copolymers tse joalo li na le molemo bakeng sa lits'ebetso tse ling tsa ho bopa, joalo ka thermoforming, e sebelisetsoang mohlala ho etsa pampiri ea tray kapa blister ho tsoa ho filimi ea Co-PET, kapa pampiri ea Amorphous PET (A-PET) kapa PETG sheet. Ka lehlakoreng le leng, crystallization ke ea bohlokoa lits'ebetsong tse ling moo ho ts'oaroang mochini le maemo ho bohlokoa, joalo ka mabanta. Bakeng sa libotlolo tsa PET, ts'ebeliso ea li-isophthalic acid tse fokolang, CHDM, diethylene glycol (DEG) kapa li-comonomers tse ling li ka ba molemo: haeba feela ho sebelisoa li-comonomers tse nyane, crystallization e ea lieha empa ha e thibeloe ka botlalo. Ka lebaka leo, libotlolo li ka fumaneha ka otlanya lets'oa ("SBM"), tse hlakileng le tse hlakileng ka ho lekana hore e ka ba mokoallo o lekaneng ho monko o monate esita le likhase, joalo ka carbon dioxide lino tse nang le khabone.