Influence of Co-Catalysts and Polymerization Conditions on Properties of Poly(anhydride-altepoxide)s from ROCOP Using Salen Complexes with Different Metals
| Autor: | Matteo Proverbio, Laura Boggioni, Incoronata Tritto, Nella Galotto Galotto, Simona Losio |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
endocrine system
Phthalic anhydride Polymers and Plastics high glass transition temperature high molecular weight Epoxide ROCOP General Chemistry polyesters lcsh:QD241-441 Polyester chemistry.chemical_compound lcsh:Organic chemistry chemistry Polymerization Polymer chemistry Copolymer Ammonium azide Glass transition Cyclohexene oxide |
| Zdroj: | Polymers (Basel) 11 (2019). doi:10.3390/polym11071222 info:cnr-pdr/source/autori:Proverbio, Matteo; Galotto, Nella Galotto; Losio, Simona; Tritto, Incoronata; Boggioni Laura/titolo:Influence of Co-Catalysts and Polymerization Conditions on Properties of Poly(anhydride-altepoxide)s from ROCOP Using Salen Complexes with Different Metals/doi:10.3390%2Fpolym11071222/rivista:Polymers (Basel)/anno:2019/pagina_da:/pagina_a:/intervallo_pagine:/volume:11 Polymers Volume 11 Issue 7 Polymers, Vol 11, Iss 7, p 1222 (2019) |
| Popis: | Cyclohexene oxide (CHO) and phthalic anhydride (PA) have been reacted in the presence of commercial salen&ndash type complexes with different metals Cr (1), Al (2), and Mn (3) in combination with 4-(dimethylamino) pyridine (DMAP), bis-(triphenylphosphorydine) ammonium chloride (PPNCl) and bis-(triphenylphosphoranylidene)ammonium azide (PPNN3) as co-catalysts to obtain alternating poly(PA-alt-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 (Mn > 15 kg/mol) and glass transition temperature (Tg) 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. |
| Databáze: | OpenAIRE |
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