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运用差示扫描量热仪(DSC)、凝胶渗透色谱仪(GPC)及傅里叶红外光谱仪(FTIR)对低密度聚乙烯(LDPE)树脂的分子链结构、分子量及其分布和熔融结晶行为进行了对比分析。根据测定结果,调整树脂生产工艺参数,使LDPE 2210H电缆料的分子量稳定在8.9×104~10.3×104,分子量分布控制在4.7~5.6,短链支化度为16.1%~18.9%;其交联性能得到了改善,耐热性得到了提高。通过微观结构分析和质量跟踪监控,对LDPE 2210H树脂的质量优化起到一定的指导作用。
The molecular chain structure, molecular weight, distribution and melt crystallization behavior of low density polyethylene (LDPE) resin were characterized by differential scanning calorimetry (DSC), gel permeation chromatography (GPC) and Fourier transform infrared spectroscopy (FTIR) Conducted a comparative analysis. According to the measurement results, the resin production process parameters were adjusted so that the molecular weight of the LDPE 2210H cable material was stabilized at 8.9 × 104-10.3 × 104, the molecular weight distribution was controlled at 4.7-5.6 and the degree of short-chain branching was 16.1% -18.9% Performance has been improved, heat resistance has been improved. Through the microstructure analysis and quality tracking monitoring, the quality of LDPE 2210H resin plays a guiding role.