CH3 当mH OH+ ncl-C-Cl CH3 CH O o-C CH mtn 聚碳酸酯工程塑料Organic Chemistry Organic Chemistry Xiamen Xiamen University University HO C CH 3 CH 3 OH + Cl C C l O m n O C CH 3 CH 3 O C O m+n 聚碳酸酯 工程塑料