Polyvinyl alcohol films with different degrees of hydrolysis and polymerization

Polyvinyl alcohol films with different degrees of hydrolysis and polymerization

Authors

DOI:

https://doi.org/10.5433/1679-0375.2019v40n2p169

Keywords:

Biodegradable polymer, Degree of hydrolysis, Degree of polymerization.

Abstract

The objective of this work was to manufacture biodegradable films based on polyvinyl alcohol (PVA) and also to evaluate the effect of the different degrees of hydrolysis (DH) and degrees of polymerization (DP) of PVA on the properties of these films. Four different types of PVA with DH ranging from 88.0 to 98.4% and DP ranging from 150 to 2000 were used to produce the films by casting, and glycerol was used as plasticizer. Films based on PVA with lower DH (SelvolTM 540 and 203) showed higher solubility, water vapor permeability and water sorption capacity, and also were less rigid, and had lower glass transition and melting temperatures when compared to films obtained from higher DH PVA (SelvolTM 325 and 107). The DP affected the solubility of the films, the film produced with the higher DP (SelvolTM 325 - DP = 1000????1500) showed lower solubility value. Films based on PVA with higher DP (SelvolTM 540 and 325) showed higher elongation values. Both DH and DP affected PVA films properties, resulting in materials with different possibilities of applications, however, it was observed that however the effect of DH was most important for PVA films properties than DP effect.

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Author Biographies

Suzana Mali, Universidade Estadual de Londrina

Professor, Department of Biochemistry and Biotechnology, Universidade Estadual de Londrina

Fabíola Azanha Carvalho, Universidade Estadual de Londrina.

PhD in Food Science,  Universidade Estadual de Londrina.

Ana Paula Bilck, Universidade Estadual de Londrina

PhD in Food Science,  Universidade Estadual de Londrina.

Fabio Yamashita, Universidade Estadual de Londrina

Professor, Department of Food Science,  Universidade Estadual de Londrina

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Published

2019-12-18

How to Cite

Mali, S., Carvalho, F. A., Bilck, A. P., & Yamashita, F. (2019). Polyvinyl alcohol films with different degrees of hydrolysis and polymerization. Semina: Ciências Exatas E Tecnológicas, 40(2), 169–178. https://doi.org/10.5433/1679-0375.2019v40n2p169

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