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Polyphosphazene nanotube and modified waterborne polyurethane prepared by in situ polymerization

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Abstract

Novel hybrid inorganic/organic poly[cyclotriphosphazene-co-(hexafluoroisopropylidene)] nanotubes (PZTs) were synthesized through nucleophilic substitution using one-step method. The surface of PZTs contains hydroxyl and fluorine groups with a ratio of approximately 1:3, which imparts many functional properties to the nanotubes. The introduction of the active hydroxyl groups increased the chemical bond crosslinking between the nanotubes and the matrix resin. The introduction of fluorine atom provided the hydrophobicity and abrasion resistance properties. The water contact angle of PZTs is 140.3°. Chemical reaction occurred between WPU and PZTs to form covalent bonds through in situ polymerization. The water contact angle and thermal stability of waterborne polyurethane (WPU)/PZTs increased with the increasing nanotube content. When the nanotube content was 1.0 wt%, the maximum tensile strength of the composites was 3.36 MPa and the maximum elongation-at-break was 446.8%. The nanotubes showed toughening and strengthening characteristics. When 1.0 wt% PZTs were incorporated, the friction coefficient and abrasion loss of the composites reached a minimum value. The addition of nanotubes could increase surface hardness and crosslinking degree, absorb the coating heat of friction, and reduce the adhesive wear of polymer and the wear amount. The introduction of fluorine atoms could form a chemical transfer membrane and reduce the friction coefficient. Polyphosphazene nanotubes showed excellent modification properties in the waterborne polyurethane system.

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Acknowledgements

We are thankful for the valuable support from Keqiao Innovation Research Institute of Zhejiang University of Technology (2018KQ002), Zhejiang Provincial Natural Science Foundation of China (LY18E030009, LQ14E030004, LQ18E030013) and National Natural Science Foundation of China (21504079, 31370563).

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Authors and Affiliations

  1. State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China

    Zhengping Zhao & Baoqing Shentu

  2. Zhejiang Weixing Group Co. Ltd., Taizhou, 317025, China

    Zhengping Zhao, Wei Zheng & Guogui Chen

  3. Zhijiang College, Zhejiang University of Technology, Hangzhou, 310024, China

    Zhengping Zhao

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  1. Zhengping Zhao
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  2. Wei Zheng
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  3. Guogui Chen
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  4. Baoqing Shentu
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Correspondence to Baoqing Shentu.

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Zhao, Z., Zheng, W., Chen, G. et al. Polyphosphazene nanotube and modified waterborne polyurethane prepared by in situ polymerization. Iran Polym J 29, 493–500 (2020). https://doi.org/10.1007/s13726-020-00813-9

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  • DOI: https://doi.org/10.1007/s13726-020-00813-9

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