结晶分级技术表征PE100级与耐热级管材树脂结构的差异性

Characterization of Structural Difference of PE 100 and PERT for Pipes by Crystallization Fractionation Technology

通过逐步等温结晶分级技术(SIS)、升温淋洗分级技术(TREF)和连续自成核退火分级技术(SSA)表征了聚乙烯(PE)100级管材树脂GC100S和耐热级管材树脂4731B结构的差异性。结果表明,4731B和GC100S树脂的熔融温度、结晶温度、结晶度、片晶厚度及共聚单体在主链中的分布状况基本相同,主要区别在于含有共聚单体的聚乙烯分子链的相对含量不同,4731B不含或含有少量共聚单体的聚乙烯分子链的含量比GC100S多。

The structural differences of PE100 resin pipe GC 100S and PERT 4731B polyethylene resins were analyzed by stepwise isothermal segregation （SIS）, temperature rising elution fractionation （TREF） and successive self-nucleation and annealing fractionation （SSA）. Results showed the melting temperature, crystallization temperature, crystallinity, lamellar thickness and comonomer distribution of the 4731B and GC100S resin along the chain are almost the same. The relative content of polyethylene chain with very few or without co-units is different. The relative content of these chain species of 4731B was more than GC100S.