红外光谱法定量研究硅烷自然交联聚乙烯的结构演变

Quantitative Research on Structure Evolution of Silane Natural Cross-linked Polyethylene by Infrared Spectrum

为了利用傅立叶变换红外光谱（FTIR）定量分析硅烷自然交联聚乙烯分子结构的演变，提出了一种通过热压成型制备FTIR测试用薄膜试样的方法，采用热延伸装置和索氏提取法及FTIR对一步法硅烷自然交联聚乙烯的交联结构和性能进行了分析和考察。结果表明，采用的薄膜试样制备方法操作简单，效果明显；一步法硅烷自然交联聚乙烯在湿度75％以上、温度1～15℃的自然条件下交联4d后其热延伸率、永久变形率以及凝胶率等性能均可满足JB／T10437—2004的相关要求；相应的FTIR谱图中Si-O-Si基团对应1080cm-1处的峰强度在交联第4天时为0．27，可作为快速判断一步法硅烷自然交联聚乙烯交联性能是否达标的一种参考方法。

In order to analyze the molecular structure evolution of silane natural cross-linked polyethylene （SCPE） quantitatively through fourier transformation infrared spectrum （FTIR）. A preparation methods of thin film sample for FTIR test was presented. Meanwhile, the cross-linked structures and properties of SCPE were studied by hot stretching device, Soxhlet extraction and FTIR. The results show that the preparation methods of thin film sample was simple and effective. After crosslinking 4 days at the natural conditions of that humidity is above 75% and temperature is l-15 ℃, the thermal elongation, permanent deformation and gel content of SCPE all met the requirements of standard of J13 / T 10437-2004, the strength of 1080 cm-1 peak of Si--O--Si in the corresponding FTIR spectra is 0.27 after crosslinking 4 days, which can be as a judgment of the cross-linked structure of SCPE achieving the standard mentioned above.