I-PETG

by Ubunjiniyela beDelta / NgoLwesihlanu, i-25 March 2016 / Ishicilelwe ku Impahla eluhlaza

Ukushintsha i-terephthalic acid (kwesokudla) nge-isophthalic acid (isikhungo) kwakha i-kink kwibhokisi le-PET, kuphazamise i-crystallization futhi kwehlise iphuzu lokuncibilikisa le-polymer

Ama-Copolymers

Ngaphezu kokumsulwa (owasekhaya) I-PET, i-PET modified by Copolymerization iyatholakala futhi.

Kwezinye izimo, izakhiwo eziguquliwe ze-Copolymer zifiseleka kakhulu kwisicelo esithile. Ngokwesibonelo, I-cyclohexane dimethanol (CHDM) ingangezwa emgogodleni we-polymer esikhundleni se i-ethylene glycol. Njengoba leli bhulokhi likhulu kakhulu (ama-athomu e-carbon ayisithupha) kuneyunithi ye-ethylene glycol eliyishintshayo, alihambelani namaketanga angomakhelwane ngendlela i-ethylene glycol unit ebingangena ngayo. Lokhu kuphazamisa ukwenziwa kwe-crystallization futhi kwehlisa ukushisa okuncibilikayo kwepolymer. Ngokuvamile, i-PET enjalo yaziwa ngokuthi yi-PETG noma i-PET-G (Polyethylene terephthalate glycol-modified; Eastman Chemical, SK Chemicals, ne-Artenius Italia bangabakhiqizi be-PETG). I-PETG iyi-thermoplastic ecacile ye-amorphous engabunjwa ngomjovo noma ishidi likhishwe. Ingafakwa umbala ngenkathi kusetshenzwa.

Okunye ukuguquguquka okujwayelekile i-isophthalic acid, kufakwe okunye kwe-1,4- (isigaba-) exhunyiwe umagabade amayunithi. The 1,2- (i-ortho-) noma 1,3- (meta-) Ukuxhumana kukhiqiza i-engele ngeketeni, nakho okuphazamisa i-crystallinity.

Ama-Copolymers anjalo anenzuzo ezinhlelweni ezithile zokubumba, ezifana i-thermoforming, osetshenziselwa ukwenza isibonelo se-tray noma i-blister packaging kusuka ku-co-PET film, noma ishidi le-amorphous PET (A-PET) noma ishidi le-PETG. Ngakolunye uhlangothi, i-crystallization ibalulekile kwezinye izinhlelo lapho ukuzinza kwemishini nobukhulu kubalulekile, njengamabhande esihlalo. Emabhodleleni we-PET, ukusetshenziswa kwamanani amancane we-isophthalic acid, CHDM, i-diethylene glycol (I-DEG) noma amanye ama-comonomers angaba usizo: uma kusetshenziswa amanani amancane kuphela we-comonomers, ama-crystallization ancishisiwe kodwa angavinjwanga ngokuphelele. Ngenxa yalokhu, amabhodlela atholakala nge welula blowing isikhunta (“SBM”), okucacile futhi okuyi-crystalline ngokwanele ukuba kube isithiyo esanele emaphunga nakumagesi, njenge-carbon dioxide kuziphuzo ezinekhabhoni.