The experimental results showed that TPI was easy to degrade, its relative molecular mass, melt point and crystallinity degree decreased with the increase of aging time.
结果表明，TPI极易老化，其相对分子质量随老化时间的延长而迅速降低，熔点及结晶度也逐渐降低。
The results showed that both the melt point and crystallinity of the copolymers decreased with the increase of neopentyl glycol content in copolymer.
结果表明，共聚酯的熔点和结晶度均随新戊二醇的加入而降低。
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