Synthesis of PP-<Emphasis Type="Italic">g</Emphasis>-PIP and properties of PP/PP-<Emphasis Type="Italic">g</Emphasis>-PIP binary blends |
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| Authors: | Cai-jun Zhu Lei Li Yi-nan He He Huang Qian Li Wei Yuan Hua-yi Li Shui-rong Zheng You-liang Hu |
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| Institution: | 1.Department of Applied Chemistry, School of Natural and Applied Sciences,Northwestern Polytechnical University,Xi’an,China;2.Beijing National Laboratory of Molecular Sciences, Chinese Academy of Sciences Key Laboratory of Engineering Plastics, Joint Laboratory of Polymer Science and Materials, Institute of Chemistry,Chinese Academy of Sciences,Beijing,China;3.Research and Development Center of Shenhua Ningxia Coal Industry Group Co., Ltd.,Yinchuan,China |
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| Abstract: | The polypropylene-graft-polyisoprene (PP-g-PIP) copolymers with different side chain length were synthesized by the combination of solid phase graft and anionic polymerization. The copolymers were characterized by nuclear magnetic resonance spectrum (1H-NMR), gel permeation chromatography (GPC) and differential scanning calorimetry (DSC). Five PP/PP-g-PIP blends with PP-g-PIP as a flexibilizer to toughen PP were prepared and characterized by scanning electron microscope (SEM), dynamic mechanical analysis (DMA), DSC, wide-angle X-ray diffraction (WAXD). Their morphologies, glass transition temperatures, crystallinity and mechanical properties were investigated. All the results pointed out that the covalent bonding of PP and PIP increased the compatibility and interfacial adhesion, which led to PIP well dispersed in the system and small size PIP particles in the binary blends. In addition, the toughness of PP was improved while its tensile strength slightly decreased. |
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