Effects of MAPP and/or Ethylene Acrylic Acid Copolymer on Properties of Polypropylene/Wheat Straw Powder Composites

doi:10.19491/j.issn.1001-9278.2020.10.002

Abstract

Abstract:

The effects of maleic anhydride-grafted polypropylene（MAPP） and ethylene acrylic acid copolymer（EAA） on the properties of polypropylene（PP） /wheat straw powder（WSP） composites （PP/WSP） were investigated. The results indicated that the tensile and flexural strengths of PP/WSP increased with an increase of MAPP content. However， their impact strength increased at first and then tended to decrease. Moreover， the time for PP/WSP to reach the melting peak was prolonged. When EAA is used for the composites， the tensile， flexural and impact strengths were all found to increase no matter whether MAPP was used or not， especially for the composites without MAPP. The tensile， flexural and impact strengths of PP/WSP increased by 65.04 %， 45.42 % and 6.75 %， respectively. Moreover， their storage moduli were enhanced， and their surface hydrophobocity was strengthened. The balance torque of the composites also decreased from 13.9 N·m to 11.8 N·m， and their dimension change rate and water uptake rate after immersion in water decreased. The time to reach water absorption equilibrium was shortened. The addition of EAA could improve the interfacial bonding between WSP and PP. As a result， the mechanical properties， thermal stability， surface hydrophobicity， dimensional stability and processing convenience of the composites were all modified. In addition， their water uptake was reduced.

Key words: wheat straw powder, polypropylene, composite, maleic anhydride-grafted polypropylene, ethylene acrylic acid copolymer

CLC Number:

TQ 325.1⁺4

YU Wangwang, LIU Qin, ZHANG Ying, YANG Cheng, LEI Wen. Effects of MAPP and/or Ethylene Acrylic Acid Copolymer on Properties of Polypropylene/Wheat Straw Powder Composites[J]. China Plastics, 2020, 34(10): 6-11.

Figures/Tables 8

References 30

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样品	拉伸强度/MPa	弯曲强度/MPa	冲击强度/kJ·m^?2
1	15.56	30.34	29.02
2	25.68	44.12	30.94
3	30.36	46.15	46.88
4	35.98	55.26	26.32
5	33.12	49.88	48.02

样品	拉伸强度/MPa	弯曲强度/MPa	冲击强度/kJ·m^?2
1	15.56	30.34	29.02
2	25.68	44.12	30.94
3	30.36	46.15	46.88
4	35.98	55.26	26.32
5	33.12	49.88	48.02

样品	达到塑化峰时间/s	平衡扭矩（2 000~2 300 s之间的扭矩平均值)/N·m
1	180.45	13.9
2	210.53	11.8
3	192.65	15.6
4	259.86	13.7
5	262.31	12.4

样品	达到塑化峰时间/s	平衡扭矩（2 000~2 300 s之间的扭矩平均值)/N·m
1	180.45	13.9
2	210.53	11.8
3	192.65	15.6
4	259.86	13.7
5	262.31	12.4

样品	接触角/°
1	95.6
2	102.9
3	102.8
4	102.7
5	104.3