期刊
JOURNAL OF APPLIED POLYMER SCIENCE
卷 111, 期 2, 页码 619-627出版社
WILEY-BLACKWELL
DOI: 10.1002/app.29060
关键词
waterborne polyurethane; starch nanocrystals; graft; nanocomposite; mechanical properties; structure-properties relationship
资金
- Agricultural Bioproducts Innovation Program (ABIP) of Canada
- Youth Chenguang Program of Science & Technology in Wuhan [200850731383]
- State Key Laboratory of Polymer Physics and Chemistry (Changchun Institute of Applied Chemistry, Chinese Academy of Sciences)
- Chinese Academy of Sciences [LCLC-2005-172, LCLC-2008-02]
Based on a graft from strategy, the surface of starch nanocrystals (StN) were functionalized by grafting with polycaprolactone (PCL) chains via microwave assisted ring-opening polymerization (ROP). The modified natural nanoparticles were then compounded into a PCL-based waterborne polyurethane as matrix. The structural and mechanical properties of the WPU/StN-g-PCL nanocomposites were characterized by XRD, FTIR, SEM, DSC, DMA, and tensile testing. It was interesting to note that a loading-level of 5 wt % StN-g-PCL resulted in a simultaneous enhancement of tensile strength and elongation at break, both of which were higher than those of neat WPU. This enhancement was attributed to the uniform dispersion of StN-g-PCL because of its nano-scale size, the increased entanglements mediated with grafted PCL chains, and the reinforcing function of rigid StN. Increasing the StN-g-PCL content however caused the StN-g-PCL to self-aggregate as crystalline domains, which impeded improvement in tensile strength and elongation at break, but significantly enhanced Young's modulus. (C) 2008 Wiley Periodicals, Inc. J Appl Polym Sci 111: 619-627, 2009
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