Cited by 78biodegradable polymer synthesis and propertiesPolymer crystallization and propertiesMaterial Dynamics and Properties

Analysis of structural rearrangements of poly(lactic acid) in the presence of water

Vyavahare, Omkar, Ng, David, Hsu, Shaw Ling·2014·The Journal of Physical Chemistry B

Abstract

The effects of hydration on two types of structural rearrangements, physical aging and crystallization, of poly(lactic acid) (PLA) have been characterized. Although the water absorbed is extremely small, on the order of 0.5% by weight, we found a significant increase in both the magnitude and kinetics of enthalpic relaxation near the glass transition temperature (Tg). The kinetics of aging is at least 2 times the speed as compared to dry samples. In addition, we also found that the crystallization kinetics can be increased significantly when PLA is hydrated. The initial rate of crystallization at 80 °C is extremely fast at 7 J/g/min for the hydrated state as compared to 2 J/g/min under dry conditions. However, the ultimate degree of crystallinity achieved is not different for the two types of samples. Both of these structural rearrangements in the hydrated state can be explained by an increase in segmental mobility. The fact that water has such a strong effect on PLA structure is attributed to the strong intermolecular interactions present and their changes in the hydrated state. Spectroscopic features associated with bound water or free water were found for PLA with different hydration levels. The increase in the segmental mobility was directly correlated to the presence of free liquid water disrupting the intermolecular interactions in PLA.

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Crossref · 10.1021/jp500219j

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Authors
Vyavahare, O., Ng, D., & Hsu, S. L.
Affiliations
University of Massachusetts Amherst (US)
Corresponding author
Hsu, Shaw Ling
Venue
The Journal of Physical Chemistry B
Published
2014-04-04
Volume
118
Issue
15
Pages
4185-4193
ISSN
  • 1520-5207 (ISSN-L)
  • 1520-6106
OpenAlex
W2334439952
Cited by
78
References
58
Citations by year
2026: 6 · 2025: 10 · 2024: 9 · 2023: 4 · 2022: 7 · 2021: 13 · 2020: 4 · 2019: 7 · 2018: 4 · 2017: 3 · 2016: 6 · 2015: 2 · 2014: 3
FWCI
1.77
Type
journal article
Language
en
Open access
closed
Locations
  • The Journal of Physical Chemistry B (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Physical Sciences › Materials Science › Biomaterials › biodegradable polymer synthesis and properties
  • Physical Sciences › Materials Science › Polymers and Plastics › Polymer crystallization and properties
  • Physical Sciences › Materials Science › Materials Chemistry › Material Dynamics and Properties
Keywords
polylactic acid, hydration, water absorption, physical aging, crystallization kinetics, enthalpic relaxation, glass transition, segmental mobility, bound water, free water, intermolecular interactions, crystallinity
MeSH terms
Kinetics, Polyesters, Polymers, Water, Molecular Structure, Lactic Acid

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