聚氯乙烯PVC H CH Polyvinyl chloride Cl 聚偏二氯乙烯PVDC +CH2-c Polyvinylidene Chloride 聚四氟乙烯 PTFE CF Polytetrafluoroethylene Teflon 聚丙烯腈PAN C—CH2 Polyacrylonitrile C=N 聚甲醛POM Polyformaldehyde c n聚氯乙烯 PVC Polyvinyl Chloride CH2 H C Cl n 聚偏二氯乙烯 PVDC Polyvinylidene Chloride 聚四氟乙烯 PTFE Polytetrafluoroethylene Teflon 聚丙烯腈 PAN Polyacrylonitrile 聚甲醛 POM Polyformaldehyde CH2 C Cl n Cl CF2 CF2 n C CH2 n C N O CH2 n