The Chemical Structures of some polymers 聚丙烯 CH2--CH n olypropylene CH 聚异丁烯 CH2 PIB Polyisobutylene CH3 O 聚丙烯酸 C-OH PAa Polyacrylic acid H-CH2=t-+ O 聚甲基丙烯酸甲酯PMMA C-O-CH3 Poly(methyl methacrylate) +cH29+ CHThe Chemical Structures of some Polymers 聚丙烯 PP Polypropylene 聚异丁烯 PIB Polyisobutylene 聚丙烯酸 PAA Polyacrylic acid 聚甲基丙烯酸甲酯 PMMA Poly (methyl methacrylate) CH2 C C n H OH O CH2 C C n CH3 O O CH3 CH2 CH CH3 n CH2 CH3 n C CH3