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Citation: ZHU Deqin, SHENG Yu, TONG Qinsong, WANG Zhen. Effects of PP-g-(MAH/St) and PP-g-MAH on the Properties of Polypropylene/Wood Flour Composites[J]. Chinese Journal of Applied Chemistry, ;2014, 31(8): 885-891. doi: 10.3724/SP.J.1095.2014.30629 shu

Effects of PP-g-(MAH/St) and PP-g-MAH on the Properties of Polypropylene/Wood Flour Composites

ZHU Deqin ^a ,
SHENG Yu ^a,, ,
TONG Qinsong ^b ,
WANG Zhen ^a

1.
a Fujian Key Laboratory of Polymer Materials, College of Materials Science and Engineering of Fujian Normal University, Fuzhou 350007, China;
2.
b College of Chemistry and Chemical Engineering of Fujian Normal University, Fuzhou 350007, China

Corresponding author: SHENG Yu,
Received Date: 9 December 2013
Available Online: 2 January 2014
Fund Project: 福建省科技厅重大资助项目(2012Y4002) (2012Y4002)福建省科技厅重点资助项目(2008Y0036) (2008Y0036)福建省自然科学基金资助(2010J01276) (2010J01276)

PP-g-(MAH/St) and PP-g-MAH were prepared by melt grafting polypropylene(PP) resin with maleic anhydride(MAH) and styrene(St) in a torque rheometer,and were used as compatiblizers in polypropylene/wood flour composites. The structures of PP-g-(MAH/St) and PP-g-MAH were confirmed by FTIR analysis. The effect of these two compatiblizers on the microstructure and crystal properties of PP/wood flour composites was examined by SEM and DSC to interpret and explain the difference of processing and mechanical properties of PP/wood flour composites. SEM analysis indicates that wood flour modified by PP-g-(MAH/St) has better dispersion in the PP matrix with a blurrier interface and better compatibility than that modified by PP-g-MAH. DSC results show that the heterogeneous nucleation of wood flour to PP in PP-g-(MAH/St) modified system is stronger and their crystallization temperature and crystallinity increase. The processing and mechanical properties of PP/wood flour composites reveal that PP-g-(MAH/St) has better performance than PP-g-MAH. The melt-mess flow rate of the two kinds of composites shows a steady downward trend with the increase of compatiblizer contents,while the tensile and flexural strength of PP-g-(MAH/St) modified system show a steady upward trend,and reach a maximum at 4.8 g PP-g-(MAH/St)/100 g PP. The tensile strength reachs to 40.62 MPa which is 1.29 and 1.17 times of the unmodified system and PP-g-MAH system,respectively,and at the meantime the flexural strength rises to 45.72 MPa which is 1.23 and 1.59 times as high as those of the unmodified system and PP-g-MAH system. At 3.6 g PP-g-(MAH/St)/100 g PP,the unnotched impact strength of PP-g-(MAH/St) system is 13.35 kJ/m² which is 1.62 and 1.42 times as high as that of unmodified and PP-g-MAH system,respectively.
- polypropylene,
- wood flour,
- polypropylene melt grafted with maleic anhydride/styrene monomer,
- compatibility,
- properties
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