PETG

by / Jumma'a, 25 Maris 2016 / Aka buga a Albarkatun kasa
Sauya acid mai zurfi (na dama) tare da acid isophthalic (tsakiya) yana haifar da kink a cikin sarkar PET, yana tsoma baki tare da gurnani da kuma rage darajar narkewar polymer.

Masu Copolymers

Baya ga tsarkakakke (yankance) PET, PET wanda aka gyara ta sarrafin kane yana samuwa.

A wasu halaye, abubuwan da aka gyara na copolymer sun fi dacewa don takamaiman aikace-aikacen. Misali, cyclohexane dimethanol (CHDM) za'a iya ƙara zuwa kashin kashin polymer a madadin sinadarin glycol. Tunda wannan tubalin ginin ya fi girma (6 ƙarin ƙwayoyin carbon) fiye da na ethylene glycol wanda yake maye gurbinsa, bai dace da sarƙoƙin maƙwabta ba kamar yadda ƙungiyar ethylene glycol za ta yi. Wannan yana rikitar da crystallization kuma yana saukar da zafin jiki na narkewar polymer. Gabaɗaya, irin waɗannan PET an san su da PETG ko PET-G (Polyethylene terephthalate glycol-modified; Eastman Chemical, SK Chemicals, da Artenius Italia wasu masana'antun PETG ne). PETG shine keɓaɓɓen thermoplastik ɗin amorphous wanda za'a iya yin allurar allura ko a cire shi da takarda. Yana iya zama launi yayin aiki.

Wata masaniyar zamani ita ce keɓaɓɓen acid, maye gurbin wasu daga cikin 1,4- (misalai) da alaƙa karafarini raka'a. The 1,2- (ortho-) ko 1,3- (makasudin-) haɗin kai yana haifar da kusurwa a sarkar, wanda shima yana rikitar da yawan kuka.

Irin waɗannan masu haɗin gwiwar suna da amfani ga wasu aikace-aikacen ƙira, kamar su zazzana, wanda ake amfani dashi misali don yin kwalin kwalliya ko marfin ruwa daga fim ɗin co-PET, ko amorphous PET sheet (A-PET) ko takardar PETG. A gefe guda, lu'ulu'u yana da mahimmanci a cikin wasu aikace-aikace inda ingantacciyar injiniyan da girma suke da mahimmanci, kamar bel ɗin zama. Don kwalabe PET, amfani da adadi kaɗan na acid mai cirewa, CHDM, glyhyl din glyhyl (DEG) ko wasu masu ba da shawara na iya zama da amfani: idan kawai aka yi amfani da adadi kaɗan na comonomers, yin saurin kumburi amma ba a hana shi gaba ɗaya. A sakamakon haka, ana iya samun kwalabe ta hanyar budewa busa mold ("SBM"), waxanda suke da haske da kuma lu'ulu'u wanda ya isa ya zama isasshen shinge ga kamshi da ma iskar gas, kamar su carbon dioxide a cikin abubuwan sha mai sha.


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