The changes of intrinsic viscosity and end carboxyl group content with temperature and time were studied for poly(trimethylene terephthalate)(PTT), PET and CDP.
研究了聚对苯二甲酸丙二醇酯（ PTT） ， PET ，C DP在不同温度和时间下的特性粘数和端羧基含量的变化。
The reasons for the carboxyl end group fluctuation of bottle grade PET base chips were analysed.
对瓶用基片端羧基波动的原因进行了分析。
Another end for the hydroxyl and the carboxyl group, has the water affinity.
另一端为羟基和羧基，具有亲水性。
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