Chemical Research in Chinese Universities ›› 2017, Vol. 33 ›› Issue (6): 1000-1006.doi: 10.1007/s40242-017-7097-7

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Moisture Absorption and Mechanical Properties of Chemically Modified Linen/Polypropylene Composites

HU Qiuxue1, LI Li2, YAN Wenling1, ZHAO Qi1, ZHANG Niaona1, ZHANG Yumei1, DONG Jinbiao1, LIU Baijun3, HU Wei1   

  1. 1. College of Chemical Engineering, Changchun University of Technology, Changchun 130012, P. R. China;
    2. School of Life Science and Technology, Harbin Institute of Technology, Harbin 150080, P. R. China;
    3. College of Chemistry, Jilin University, Changchun 130012, P. R. China
  • Received:2017-03-16 Revised:2017-05-15 Online:2017-12-01 Published:2017-07-21
  • Contact: HU Wei,E-mail:huwei@ccut.edu.cn E-mail:huwei@ccut.edu.cn
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.21404013), the Science and Technology Development Plan of Jilin Province, China(Nos.20130521003JH, 20140204039GX, 20160101323JC), the Changchun Science and Technology Plan Project, China(No.14KG105), the Open Research Fund of the State Key Laboratory of Polymer Physics and Chemistry of China and the Research Project of Science and Technology of the Education Department of Jilin Province of China During the 12th Five-year Plan Period(No.2015-78).

Abstract: To decrease the moisture absorption and improve the mechanical properties of linen/polypropylene(PP) composites, linen was modified with silane N-[3-(trimethoxysilyl) propyl]ethylenediamine(AAPTS), surfactant trimethyloctadecylammonium bromide(STAB), and both AAPTS and STAB, respectively. Fourier transform infrared(FTIR) spectra showed that the linen was successfully modified and alkyl chains were attached through different treatments. The linen and PP were compounded by melt compressing. The moisture absorption of linen was decreased after STAB and AAPTS-STAB modifications. The moisture absorption, mechanical property and thermal property of the composites were also characterized. The results show that the moisture absorption of the AAPTS-modified linen(F1) reinforced PP(PPF1) is 8.09%, which is higher than that of the unmodified linen reinforced PP(PPF)(7.89%). The moisture absorption of the STAB-AAPTS-modified linen(F3) reinforced PP(PPF3) is 6.58%. The tensile strengths of PPF1 and PPF3 are 33.7 and 35.8 MPa, which are improved by 22.5% and 30% compared with that of PPF(27.5 MPa), respectively. Nevertheless, the moisture absorption of the STAB-modified linen(F2) reinforced PP(PPF2) is decreased by 22.4%, and the tensile strength is improved by 30% compared with those of PPF. Scanning electron microscopy(SEM) analysis of the fractured surface confirms the good interfacial adhesion of PPF2 compared with those of other composites. Furthermore, the 5% mass loss temperatures of the composites are all higher than 290℃. Thus, linen modified with STAB is a promising reinforcement for biocomposites.

Key words: Linen, Moisture absorption, Surfactant, Polypropylene, Composite