petg

Nā mea ʻoliā

I ke keuhomopolymer) PET, PET hoʻololi ma o hoʻo·polymerization aia kekahi.

I kekahi mau hihia, ʻoi aku ka waiwai o ka copolymer i makemake nui ʻia no kahi noi. O kahi laʻana, cymlohexane dimethanol (CHDM) hiki ke hoʻohui ʻia i ka kua polu polymer ma kahi o Ethylene glycol. ʻOiai ʻoi aku ka nui o kēia palaka hale (6 mau ʻāpana ʻāpana carbon hou aʻe) ma mua o ka anakahi ethylene glycol i pani ʻia, ʻaʻole ia e kūpono me nā kaulahao kokoke e like me ke ʻano o ka elylene glycol unit. Hoʻopilikia kēia me ka crystallization a hoʻohaʻahaʻa i ka mahana hoʻoheheʻe o ka polymer. Ma ka laulā, ʻike ʻia kēlā PET me PETG a i ʻole PET-G (Polyethylene terephthalate glycol-i hoʻololi ʻia; Eastman Chemical, SK Chemicals, a me Artenius Italia kekahi mau mea hana PETG). ʻO PETG kahi thermoplastic amorphous maopopo i hiki ke hoʻoheheʻe ʻia a i ʻole ka extruded sheet. Hiki ke kala ʻia i ke kaʻina hana.

ʻO kekahi mea hoʻololi maʻamau kaomi isophthalic, ke hoʻololi nei i kekahi o nā 1,4- (no-) pili pili terephthalate wae. ʻĀina 1,2- (orthu-) ai 'ole 1,3- (meta-) pili ka pilina ma kahi kihi i loko o ke kaulahao, kahi e hoʻokaʻawale i ke aniani.

Loaʻa maikaʻi kēlā mau copolymers no nā noi kele, e like me ʻōhua, ka mea i hoʻohana ʻia no ka hana ʻana i ke pālaʻi ʻana a i ʻole ke kīleʻe blister mai nā kiʻi co-PET, a i ʻole sheet amorphous PET (A-PET) a i ʻole sheet PETG. Ma ka ʻaoʻao ʻē aʻe, he mea nui ka crystallization i nā noi ʻē aʻe kahi mea nui ka mīkini a me ka dimensional, e like me nā kāʻei noho. No nā kīʻaha PET, ʻo ka hoʻohana ʻana o nā hua liʻiliʻi o ka waikawa isophthalic, CHDM, kekehi glycol Hiki i nā ʻenemi (DEG) a i ʻole nā ​​mea hōʻuluʻulu ʻē aʻe: inā he mau liʻiliʻi liʻiliʻi wale nō e hoʻohana ʻia, ua lohi ʻia ka crystallization akā ʻaʻole i pale ʻole. ʻO ke hopena, hiki ke loaʻa nā hue ma nā kauā ʻana i ka pana ("SBM"), he moakāka a crystalline nā mea āpau e lilo i pale ākea i nā mea ʻala a me nā kinoea, e like me carbon dioxide i nā mea inu carbonated.