Influences of PP-g-MA on the surface free energy, morphologies and mechanical properties of thermoplastic polyurethane / polypropylene blends

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• 作者：Shikui Jia ; Yan Zhu ; Zhong Wang ; Ligui Chen ; Lei Fu
• 关键词：Thermoplastic polyurethane(TPU)/polypropylene(PP) ; Surface free energy ; Interfaces ; Morphology ; Mechanical properties
• 刊名：Journal of Polymer Research
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：22
• 期：8
• 全文大小：1,522 KB
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• 作者单位：Shikui Jia (1)
  Yan Zhu (1)
  Zhong Wang (1)
  Ligui Chen (1)
  Lei Fu (1)
  
  1. School of Materials Science and Engineering, Shaanxi University of Technology, Hanzhong, 723000, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Polymer Sciences
  Industrial Chemistry and Chemical Engineering
  Characterization and Evaluation Materials
  
• 出版者：Springer Netherlands
• ISSN：1572-8935

文摘

The effects of polypropylene-g-maleic anhydride (PP-g-MA) addition on the surface free energy (SFE), morphologies, and mechanical properties of thermoplastic polyurethane (TPU)/polypropylene (PP) blends were investigated in this study. Specifically, the SFEs of the unmodified and PP-g-MA-modified TPU/PP blends were studied through contact angle (CA) measurements; when PP-g-MA content was increased from 3 to 11 phr, the SFE of the blends decreased with different TPU/PP blending ratios while the corresponding CA increased. This decrease was attributed to the interaction between PP-g-MA and TPU. Wide-angle X-ray (WAXD) diffraction results indicated that the crystalline morphology of the blends was not significantly influenced by PP-g-MA. This morphology was observed through scanning electron microscopy (SEM), and the results showed that the TPU/PP blends exhibited an incompatible microstructure that improved with the addition of PP-g-MA. The partial disperse size curve indicated the changes in partial disperse phase size as observed through SEM. Moreover, the fine and mean partial dispersion of the TPU/PP blend was initiated by increasing PP-g-MA content. Specifically, the mechanical properties of the TPU/PP blend were optimized with the addition of 7 phr PP-g-MA. The thermogravimetric (TG) curves suggested that the addition of PP-g-MA could enhance the miscibility of TPU/PP blends.