The modifiers include polystyrene (PS), epoxy resin (EP), Paraformaldehyde (PA) and benzaldehyde (BA).
实验选择的改性剂包括：聚苯乙烯(PS)、环氧树脂(EP)、多聚甲醛(PA)、苯甲醛(BA)。
参考来源 - 低毒煤沥青的制备及其物化性能研究·2,447,543篇论文数据，部分数据来源于NoteExpress
N a white amorphous solid polymeric form of formaldehyde: used as a convenient source of formaldehyde and as a fumigant. Formula: (CH2O)n, where n lies between 6 and 50 多聚甲醛
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