Miscibility, properties and morphology of biodegradable blends of UHMW-PPC/PVA/EVOH |
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| Authors: | Xi Chen S J Wang M Xiao D M Han Yuezhong Meng |
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| Affiliation: | (1) The Key Laboratory of Low-carbon Chemistry & Energy Conservation of Guangdong Province / State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-Sen University, Guangzhou, 510275, People’s Republic of China; |
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| Abstract: | Thermally stable and biodegradable blends of ultrahigh molecular weight poly(propylene carbonate) (UHMW-PPC), poly(vinyl alcohol)
(PVA) and poly(ethylene-co-vinyl alcohol) (EVOH) were melt compounded in a batch mixer followed by compression molding. The
miscibility, mechanical properties, thermal behavior, and morphologies of the blends were investigated by torque rheometer,
Fourier transform infrared spectroscopy, tensile strength test, thermogravimetric analysis, differential scanning calorimetry
and scanning electron microscopy. The experimental results showed well interfacial miscibility among phases of PVA, EVOH and
PPC. The hydrogen bonding interaction between PPC with PVA and/or EVOH can also be confirmed by Fourier transform infrared
spectroscopy spectra. The study on the mechanical properties and thermal behavior demonstrated that PVA/EVOH content can enhance
the tensile strength, thermal stability and crystallinity of the blends dramatically. Further, scanning electron microscopic
observation revealed a three-phase structure with good interfacial adhesion. |
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