Water vapor permeability of biodegradable polymers

  • Randal Shogren


The water vapor transmission rates (WVTR) of several biodegradable polymers were evaluated to determine their suitability as water-resistant coatings and to understand WVTR better in terms of polymer structure. Values of WVTR at 25‡C ranged from 13 to 2900 g/m2 /day and increased in the order PHBV PLA (cryst.) PLA (amorph.) PCL Bionolle BAK 1095 CAP CA. Values of WVTR were positively correlated with higher polymer solubility parameters, lower crystallinities, and higher free volumes. Although the WVTR of biodegradable polymers are much higher than those of good barrier materials such as low-density polyethylene, they are sufficient for short-term (hours to days) protection of polysaccharide-based materials against water.

Key Words

Biodegradable coating laminate starch polyester 


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Copyright information

© Plenum Publishing Corporation 1997

Authors and Affiliations

  • Randal Shogren
    • 1
  1. 1.U.S. Department of AgriculturePlant Polymer Research Unit, National Center for Agricultural Utilization Research, Agricultural Research ServicePeoria

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