Preparation and Performance of PE⁃HD/Wheat Straw Composites Filled by Mineral Fillers

doi:10.19491/j.issn.1001-9278.2021.03.001

Abstract

Abstract:

PE-HD/WSF/Filler composites were prepared by melt mixing and injection molding using high-density polyethylene （PE-HD） as a matrix polymer， wheat straw fibers （WSF） as a reinforcement fiber， and dolomite powders， wollastonite powders， and talcum powders as fillers. The effects of filler type and content on the performance of the composites were investigated. The results indicated that with the addition of 40 wt% WSF， the tensile and flexural strength of the composite material increased at first and then tended to decrease with an increase in filler content. The composites achieved optimial mechanical properties at a filler content of 5 wt%. At this filler content， wollastonite exhibited a better reinforcing effect than dolomite and talc， leading to the highest crystallization rate. The partial replacement of PE-HD with fillers resulted in a decrease in the water resistance of the composite， and a minimum water absorption rate was also obtained at a filler content of 5 wt%. SEM observation indicated that the tiny filler particles were embedded between WSF and PE-HD， resulting in a reduction in the gap between WSF and PE-HD and an improvement in interfacial adhesion.

Key words: wheat straw fiber, high-density polyethylene, mineral filler, mechanical property, water absorption

CLC Number:

TQ325.1⁺2

DUAN Jingting, ZHANG Xiaolin, WANG Zhe, LI Shaoge, DI Jingjing, LYU Jinyan, ZHU Xiaofeng, WANG Yi. Preparation and Performance of PE⁃HD/Wheat Straw Composites Filled by Mineral Fillers[J]. China Plastics, 2021, 35(3): 1-7.

Figures/Tables 10

序号	PE?HD含量/%	WSF含量/%	填料含量/%
1	57	40	3
2	56	40	4
3	55	40	5
4	54	40	6
5	53	40	7

Tab.1. PE?HD/WSF composite formula with different fillers

Fig.1. Preparation process flow of the PE?HD/WSF composite

Fig.2. Micro?morphology of inorganic fillers of different shapes (×1 500)

Fig.3. Tensile strength of PE?HD/WSF composites filled with different fillers and contents

Fig.4. Flexural properties of PE?HD/WSF composites filled with different fillers and contents

Fig.5. DSC curves of PE?HD/WSF composites filled with different fillers

样品	$T m p$ /℃	$T c p$ /℃	ΔH_m/J·g^-1	ΔH_c/J·g^-1	ΔT_c/℃	X_c/%
PE?HD	133.2	113.6	97.9	-103.7	19.6	34.07
PE?HD/40 %WPE	132.2	113.7	104.3	-121.2	18.5	60.51
PE?HD/40 %WPE/5 %白云石	133.3	112.6	87.0	-112.9	20.7	55.03
PE?HD/40 %WPE/5 %硅灰石	131.0	114.7	84.5	-104.6	16.3	53.46
PE?HD/40 %WPE/5 %滑石粉	132.1	114.6	100.0	-103.9	17.5	63.29

样品	$T m p$ /℃	$T c p$ /℃	ΔH_m/J·g^-1	ΔH_c/J·g^-1	ΔT_c/℃	X_c/%
PE?HD	133.2	113.6	97.9	-103.7	19.6	34.07
PE?HD/40 %WPE	132.2	113.7	104.3	-121.2	18.5	60.51
PE?HD/40 %WPE/5 %白云石	133.3	112.6	87.0	-112.9	20.7	55.03
PE?HD/40 %WPE/5 %硅灰石	131.0	114.7	84.5	-104.6	16.3	53.46
PE?HD/40 %WPE/5 %滑石粉	132.1	114.6	100.0	-103.9	17.5	63.29

Tab.2. Crystallization data of PE?HD/WSF composites

Fig.6. Influence of different fillers and contents on water absorption properties of PE?HD/WSF composites

样品	吸水率/%
样品	10 d	42 d
PE?HD/40 %WSF/5 %白云石	7.27	11.56
PE?HD/40 %WSF/5 %硅灰石	8.42	13.21
PE?HD/40 %WSF/5 %滑石粉	7.85	12.24

Tab.3. Water absorption with 5 % different fillers of PE?HD/WSF composites

Fig.7. SEM images of PE?HD/WSF composites (×1 500)

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