Effect of boron oxide (B2O3) on thermal and mechanical decomposition behavior of PET

Öz

In this study, different amounts of boron oxide (B2O3) (0.05-0.8% by mass) were incorporated to polyethylene terephthalate (PET) by extrusion method, and then PET/B2O3 granules and bottles were produced using the injection and stretch-blow-molding methods, respectively. With the increase of B2O3 content, the viscosity of PET composite decreased and the lowest viscosity value was measured as 0.385 dL/g for %0.8 B2O3 concentration. The crystallization temperature (Tc) of PET composites increased by about 8.2ºC due to the increase in the amount of B2O3. While no effect of B2O3 additive was observed on isophthalic acid (IPA) released as a result of the degradation of PET, a decrease in the amount of acetaldehyde (AA) and an increase in the amount of carboxylic acid (COOH) and diethylene glycol (DEG) occurred.

Anahtar Kelimeler

• • Packaging
• B2O3
• PET
• Polyethylene terephthalate
• Bottle
• Thermal decomposition

Bor oksit’in (B2O3) PET’in termal ve mekanik bozunma davranışı üzerine etkisi

Öz

Bu çalışmada, ekstrüzyon yöntemiyle bor oksit (B2O3) farklı miktarlarda (kütlece %0,05–0,8) polietilen tereftalat’a (PET) katkılanarak önce PET/B2O3 granülleri sonrasında ise sırasıyla enjeksiyon ve gerdirme-şişirme-kalıplama yöntemleriyle şişe üretimi gerçekleştirildi. B2O3 içeriğinin artmasıyla PET kompozitin viskozitesi azalmış ve en düşük viskozite değeri %0,8 B2O3 konsantrasyonu için 0,385 dL/g olarak ölçülmüştür. PET kompozitlerin kristalleşme sıcaklığı (Tc), B2O3 miktarının artışına bağlı olarak yaklaşık 8,2ºC yükselmiştir. PET’in bozunması sonucu açığa çıkan izoftalik asit (IPA) üzerinde B2O3 katkısının herhangi bir etkisi görülmezken asetaldehit (AA) miktarında azalma, karboksilik asit (COOH) ve dietilen glikol (DEG) miktarında ise artış meydana gelmiştir.

Anahtar Kelimeler

• • Ambalaj
• B2O3
• PET
• Polietilen Tereftalat
• Şişe
• Termal Bozunma

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