Journal
POLYMER
Volume 64, Issue -, Pages 51-61Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2015.03.015
Keywords
Reactive blending; Poly(lactic acid) (PLA); Poly-3-hydroxyoctanoate (PHO)
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Funding
- Natural Sciences and Engineering Council of Canada (NSERC)/CRD program
- Xerox Corporation
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Poly(3-hydroxyoctanoate) (PHO), poly(lactic acid) (PLA) and PHO/PLA blends were reactively modified in the melt state, using dicumyl peroxide (DCP) and triallyl trimesate (TAM) trifunctional coagent. The viscosity and elasticity of PHO and PLA increased substantially following reactive modification. The processability of the partially cross-linked PHO was improved, whereas coagent-modified PIA displayed strain hardening and enhanced crystallization. Reactive compounding of PLA and PHO in the presence of DCP and TAM resulted in blends with enhanced strain hardening, indicative of high melt strength, and improved crystallinity compared to the unreacted blend. Furthermore these blends had a finer morphology, which was attributed to a compatibilizing effect possibly arising from copolymer formation at the interface. The elongation at break and impact properties of the blends were improved compared to the neat PLA, while the heat deflection temperature remained unaffected. (C) 2015 Elsevier Ltd. All rights reserved.
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