Preparation and performance of PP/EPR/modified cellulose composite

doi:10.19491/j.issn.1001-9278.2021.12.007

Abstract

Abstract:

PP/EPR/modified cellulose （M?C） composites were prepared through melt blending using binary ethylene propylene rubber （EPR） as a toughening material， cellulose as a reinforcing material， and vinyl?alcohol?grafted EPR （EPR?g?VA） as a compatibilizer. Their structure was verified by infrared spectroscopy and X?ray diffraction analysis， and their micromorphology， spherulite size， thermal stability， and mechanical properties were analyzed using scanning electron microscope， polarizing microscope， thermogravimetric analyzer， plastic dynamic property testing machine， and electronic universal testing machine. The results indicated that a skin?core?like structure was formed in the alkali?pretreated cellulose coated with EPR and EPR?g?VA. Compared to the PP/EPR blends， the PP/EPR/M?C composites exhibited a significant improvement in thermal and mechanical properties. When the content of PP/EPR/M?C was 6 wt%， the composites exhibited a Vicat softening temperature of 146.5 ℃ and impact strength of 12.59 kJ/m². Meanwhile， the spherulite size of PP phase in the composites became smaller and its crystal interface became blurry.

Key words: polypropylene, binary ethylene propylene rubber, cellulose, composite, strengthening, toughening

CLC Number:

TQ325.1⁺4

HAN Xianxin, LIU Xijun, WANG Yuwei. Preparation and performance of PP/EPR/modified cellulose composite[J]. China Plastics, 2021, 35(12): 37-44.

Figures/Tables 12

References 15

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编号	EPR?g?VA	APC
M?C?1	3	1
M?C?2	3	3
M?C?3	3	5

编号	EPR?g?VA	APC
M?C?1	3	1
M?C?2	3	3
M?C?3	3	5

样品名称	PP	EPR	M?C	抗氧剂1010
PP	100	0	0	0.8
PP/EPR（80/20）	80	20	0	0.8
PP/EPR/M?C?1	80	20	4	0.8
PP/EPR/M?C?2	80	20	6	0.8
PP/EPR/M?C?3	80	20	8	0.8

样品名称	PP	EPR	M?C	抗氧剂1010
PP	100	0	0	0.8
PP/EPR（80/20）	80	20	0	0.8
PP/EPR/M?C?1	80	20	4	0.8
PP/EPR/M?C?2	80	20	6	0.8
PP/EPR/M?C?3	80	20	8	0.8

样品名称	结晶温度（T_c）/℃	熔融温度（T_m）/℃	熔融焓/ J·g^-1	结晶度/ %
PP	115.45	164.07	87.77	42.00
PP/EPR（80/20）	114.67	163.14	64.84	38.78
PP/EPR/M?C?1	117.55	163.53	70.26	42.02
PP/EPR/M?C?2	118.83	164.79	75.68	45.26
PP/EPR/M?C?3	117.87	164.37	71.01	42.47