PHB copolymers are preferred for general purposes as the degradation rate of PHB homopolymer is high at its normal melt processing temperature.

基丁酸酯共聚物是作为均聚物PHB的降解率一般用途的首选是在其正常高熔体加工温度。

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And much research was needed on the effect of high temperature on fat degradation.

关于高温对油脂的降解影响需在今后的实验中有待进一步研究。

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However, some drawbacks exist, such as high temperature agi ng in process of modification, low storage stability and degradation acceleration under ultraviolet.

但也存在某些不足，如改性沥青加工过程中的温度老化、贮存稳定性及在紫外线作用下降解加速材料老化等问题。

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