Evaluation of shape memory effect in PLA/copolymers blends

Author:

da Cunha Rafael Braga1ORCID,Cavalcanti Shirley Nóbrega1ORCID,Agrawal Pankaj1ORCID,de Figueiredo Brito Gustavo12ORCID,de Mélo Tomás Jeferson Alves1ORCID

Affiliation:

1. Department of Materials Engineering Federal University of Campina Grande Campina Grande Paraiba Brazil

2. Department of Design Paraiba Federal University João Pessoa Paraiba Brazil

Abstract

AbstractIn this work, polylactic acid (PLA)/copolymer blends were prepared by melt blending. Ethylene‐glycidyl methacrylate (E‐GMA) and ethylene‐butyl acrylate‐maleic anhydride (EBA‐MAH) functional block copolymers were used. A ternary blend of PLA/E‐GMA/EBA‐MAH was also studied. FTIR analyses evidenced the occurrence of reactive compatibilization of E‐GMA and EBA‐MAH with PLA in the binary blends due to the reactivity of the GMA and MAH functional groups with the terminal hydroxyl and carboxyl groups of PLA. Rheological measurements evidenced the occurrence of cross‐link reactions between E‐GMA and EBA‐MAH copolymers in the ternary blend. Three distinct morphologies were observed in the blends: PLA/E‐GMA exhibited a sea‐island structure, PLA/EBA‐MAH exhibited a co‐continuous structure, and PLA/E‐GMA/EBA‐MAH exhibited a semi‐interpenetrating polymer network (SIPN) structure. The shape memory effect (SME) of PLA and PLA/copolymers blends was evaluated by three different methods: fold‐deploy, tension, and torsion. Fold‐deploy tests were conducted in a water bath, whereas the tension and torsion tests were conducted using a rheometer. All methods proved to be effective; however, some precautions must be taken to choose the most suitable test for a given purpose, which is thoroughly discussed in this work. The SME of PLA was enhanced through the incorporation of the copolymers. Blending PLA with E‐GMA, EBA‐MAH, and E‐GMA/EBA‐MAH copolymers increased its shape recovery from 32% to 84%, 79.2%, and 80%, respectively, while its shape fixity remained around 100%.

Funder

Conselho Nacional de Desenvolvimento Científico e Tecnológico

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior

Publisher

Wiley

Subject

Materials Chemistry,Polymers and Plastics,Surfaces, Coatings and Films,General Chemistry

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