中文摘要：

采用变温FTIR光谱法研究了原料PET和PET/nano-CaCO3（MPET）复合材料体系在40～250 ℃之间逐渐升温过程中，PET基体的固态转变。通过研究PET内标谱带1 410 cm-1与结晶相关谱带1 342 cm-1吸光度之比值随温度变化关系曲线，结合其在同样条件下的差热扫描（DSC）曲线，分析了纳米CaCO3粒子的加入对PET固态转变和结晶相关谱带的影响, 表明纳米CaCO3粒子的加入显著改善了PET的结晶和熔融行为。

英文摘要：

Solid state transformation of crude poly （ethylene terephthalate）（PET） and PET/nano-CaCOa （MPET） composites were studied by variable temperature FTIR spectroscopy during the heating process from 40 to 250 ~C. The effects of nanometer calcium carbonate（nano-CaCO3） on the solid state transformation and crystal correlation bands of MPET composites were ana- lyzed by the curves of the ratio of 1 342 and 1 410 cm 1 absorbency（A1342/A1410） with temperature increasing, and together with DSC curves in the same condition. The results showed that the crystallization degrees of crude PET and MPET are obviously dif- ferent in this condition by adding nano-CaCO3 particles as inhomogeneous nucleating agents.