Proverbio Matteo, Galotto Nella Galotto, Losio Simona, Tritto Incoronata, Boggioni Laura
Institute for Macromolecular Studies, National Research Council, Via A. Corti, 12, 20133 Milan, Italy.
Polymers (Basel). 2019 Jul 22;11(7):1222. doi: 10.3390/polym11071222.
Cyclohexene oxide (CHO) and phthalic anhydride (PA) have been reacted in the presence of commercial salen-type complexes with different metals Cr (), Al (), and Mn () in combination with 4-(dimethylamino) pyridine (DMAP), bis-(triphenylphosphorydine) ammonium chloride (PPNCl) and bis-(triphenylphosphoranylidene)ammonium azide (PPNN) as co-catalysts to obtain alternating poly(PA--CHO)s by ring-opening copolymerization (ROCOP). The effect of different reaction conditions (pre-contact between catalyst and co-catalyst, polymerization time) on the productivity, molecular weight and glass transition temperature has been evaluated. By using a 24 h pre-contact, the aliphatic polyesters obtained were characterized by high molecular weight ( > 15 kg/mol) and glass transition temperature () up to 146 °C; the more sustainable metals Al and Mn in the presence of PPNCl give comparable results to Cr. Moreover, biodegradability data of these polyesters and the study of the microstructure reveal that the biodegradability is influenced more by the type of chain linkages rather than by the molecular weight of the polyesters.
在商业水杨醛型配合物与不同金属Cr（）、Al（）和Mn（）存在的情况下，环氧环己烷（CHO）与邻苯二甲酸酐（PA）在4-（二甲基氨基）吡啶（DMAP）、双（三苯基磷基）氯化铵（PPNCl）和双（三苯基磷亚基）叠氮化铵（PPNN）作为共催化剂的条件下发生反应，通过开环共聚（ROCOP）获得交替聚（PA-CHO）。评估了不同反应条件（催化剂与共催化剂的预接触、聚合时间）对产率、分子量和玻璃化转变温度的影响。通过24小时的预接触，得到的脂肪族聚酯具有高分子量（>15 kg/mol）和高达146℃的玻璃化转变温度（）；在PPNCl存在下，更具可持续性的金属Al和Mn给出了与Cr相当的结果。此外，这些聚酯的生物降解性数据和微观结构研究表明，生物降解性受链连接类型的影响大于受聚酯分子量的影响。
