Journal
MACROMOLECULAR MATERIALS AND ENGINEERING
Volume 295, Issue 8, Pages 750-762Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/mame.201000063
Keywords
barrier; biodegradable; micro-talc; polycaprolactone (PCL); poly(lactic acid) (PLA)
Funding
- Department of Foreign Affairs and International Trade (DFAIT), Canada
- Canadian Bureau for International Education (CBIE)
- Council of Scientific and Industrial Research (CSIR), New Delhi, India
- Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA) [SR9223]
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The influence of talc loading on phase morphology of PLA/PCL/talc composites and improvement in resulting properties are reported. Talc-based composites of PLA/PCL blends were prepared by melt blending. SEM analysis demonstrates that PLA appears as discrete domain phase, while PCL acts as a bulk phase in the blend. Talc addition decreases PLA domain sizes and voids in the matrix. This results in significant improvement of oxygen and water vapor barrier properties of composite by 33 and 25%, respectively, at 3 wt.-% talc loading. DSC shows that talc acted as nucleating agent for PCL phase in the composite and improves its crystallinity. Various theoretical models based on dispersion and filler geometry are used to predict the tensile modulus and oxygen permeability.
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