调制式DSC测定聚乙烯的结晶度

STUDY ON MEASUREMENT OF CRYSTALLINITY OF POLYETHYLENE BY MODULATED DSC

为探索和建立用DSC测量聚乙烯(PE)结晶度的标准方法,采用调制式DSC(MDSC)对不同PE的固有结晶度进行了分析和测定;研究了PE在熔融过程中可逆与不可逆热流所对应的可能的大分子结构及运动特征,根据实验确定的包括基线在内的测定方法精确测定了不同PE的固有结晶度,并与广角X射线衍射的结果进行了比较。

In order to set up a standard method of measuring the crystallinity of polyethylene, the inherent crystallinities of HDPE and LDPE were analysised and measured by modulated DSC in this article. The mechanism and corresponding molecular motion behaviours of reversing and nonreversing heat flow were studied. At last, the inherent crystallinities of a series of high density and low density polyethylenes were measured under the ultimate conditons of our study. The DSC results were compared to that of WAXD.