Effects of Annealing Condition on the Glass Transition Behavior of PET in R-PET/LLDPE-g-MA Blends

Abstract

Abstract:

Effects of annealing temperature and annealing time on the glass transition of PET in the Recycle-polycethylene terephatalate(R-PET)/LLDPE-g-MA blends were investigated by DSC. The sub-T_g annealing leads to the enthalpy relaxation in the glass transition region of PET. The T_g of PET shifts to higher temperature with the increase of annealing temperature. The T_g of PET tends to be stable in the blends annealed at 50—70 ℃ for more than 48 h. After above-T_g annealing below 100 ℃, two heat flow transitions of PET appear around the T_g of PET. FTIR results show that molecular conformation of PET begin to change. However, the glass transition of PET disappears in the blend annealed at 100 ℃, and WAXD results show that the crystallinity of PET increases obviously, indicating that the T_cc,on of PET is between 90—100 ℃.

Key words: Recycle-polycethylene terephatalate(R-PET), Glass transition, Annealing temperature, Annealing time

TrendMD:

ZHANG Yue, ZHANG Hong-Sheng, GUO Wei-Hong, WU Chi-Fei*. Effects of Annealing Condition on the Glass Transition Behavior of PET in R-PET/LLDPE-g-MA Blends[J]. Chem. J. Chinese Universities, 2009, 30(5): 1024.

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