聚对苯二甲酸乙二酯(PET)薄膜经固相缩聚反应后，用凝胶色谱法测定产物的分子量、分子量分布和环状齐聚物含量。
Polyethylene terephthalate (PET) films were polymerized in solid phase, the molecular weight, molecular weight distribution (MWD) and cyclic oligomer content of the products were determined by GPC.
用红外光谱、凝胶渗透色谱、动态黏弹仪研究了苯乙烯-丁二烯嵌段共聚物（SBS）改性沥青的薄膜烘箱老化行为。
Thin film oven aging behaviors of SB S modified asphalts were studied by infrared spectrum, gel permeation chromatography, dyn amic mechanical property analysis.
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