Study on Interface Modification Methods and Properties of PLA/Rice Husk Powder Composites

doi:10.19491/j.issn.1001-9278.2021.06.013

Abstract

Abstract:

PLA/rice husk powder wood plastic composites were prepared by a compression molding method with chitosan， silane?coupling agent and sodium hydroxide as modifiers. Their mechanical properties and water absorption of the composites were characterized， and their crystalline structures were analyzed with XRD. The results indicated that the composites exhibited a higher Rockwell hardness at a chitosan mass of 4 g， and their impact strength， bending strength， tensile strength， and water absorption increased by 22 %， 77 %， 48 %， and 40 % respectively. When the content of silane coupling agent was 2 g， their impact strength， bending strength and tensile strength increased by 32 %， 78 % and 61 %， respectively， but their water absorption decreased by 7 %. When the rice husk powders were treated with 6 g sodium hydroxide， the composites did not show a significant enhancement in mechanical properties， and their water absorption increased by 15 %. In summary， silane coupling agent has a good comprehensive modification effect on the composites， chitosan can better improve the mechanical properties of the composites， and NaOH is an excellent hydrophilic modifier.

Key words: rice husk powder, poly（lactic acid）, composite, mechanical property, coupling agent

CLC Number:

TQ321

SUN Dongbao, LU Qin, LU Xinyu, JIA Wangyi, CAO Shang. Study on Interface Modification Methods and Properties of PLA/Rice Husk Powder Composites[J]. China Plastics, 2021, 35(6): 80-84.

Figures/Tables 5

References 11

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改性剂种类	改性剂含量/g	拉伸强度/MPa	弯曲强度/MPa	冲击强度/MJ·m^-2
无	0	7.96±0.98	9.53±0.72	5.13±0.93
壳聚糖	2	8.17±0.85	10.56±0.83	5.84±0.81
	4	11.67±0.73	16.21±0.94	6.22±0.75
	6	10.56±0.83	10.56±0.87	5.98±0.68
硅烷偶联剂	2	13.11±0.95	14.57±0.64	7.71±0.73
	4	12.06±0.78	16.93±0.92	6.19±0.85
	6	11.96±0.75	16.34±0.73	9.66±0.96
NaOH	2	5.52±0.82	5.67±0.86	4.54±0.87
	4	4.51±0.91	5.88±0.79	4.26±0.65
	6	8.07±0.84	5.72±0.84	5.43±0.87

改性剂种类	改性剂含量/g	拉伸强度/MPa	弯曲强度/MPa	冲击强度/MJ·m^-2
无	0	7.96±0.98	9.53±0.72	5.13±0.93
壳聚糖	2	8.17±0.85	10.56±0.83	5.84±0.81
	4	11.67±0.73	16.21±0.94	6.22±0.75
	6	10.56±0.83	10.56±0.87	5.98±0.68
硅烷偶联剂	2	13.11±0.95	14.57±0.64	7.71±0.73
	4	12.06±0.78	16.93±0.92	6.19±0.85
	6	11.96±0.75	16.34±0.73	9.66±0.96
NaOH	2	5.52±0.82	5.67±0.86	4.54±0.87
	4	4.51±0.91	5.88±0.79	4.26±0.65
	6	8.07±0.84	5.72±0.84	5.43±0.87

改性剂种类	改性剂含量/ g
改性剂种类	改性剂含量/ g	12	24	48
—	0	15±2.1	23±2.2	22±2.2
壳聚糖	2	21±1.9	22±1.1	26±2.5
	4	15±2.2	20±2.3	21±2.3
	6	10±2.3	13±1.5	17±1.6
硅烷偶联剂	2	11±1.5	13±1.8	14±2.3
	4	13±2.5	8±2.3	12±1.8
	6	16±2.2	14±2.2	17±1.9
NaOH	2	37±1.7	39±1.9	43±1.5
	4	43±2.2	41±2.4	46±1.6
	6	37±2.1	36±1.6	39±2.2

改性剂种类	改性剂含量/ g
改性剂种类	改性剂含量/ g	12	24	48
—	0	15±2.1	23±2.2	22±2.2
壳聚糖	2	21±1.9	22±1.1	26±2.5
	4	15±2.2	20±2.3	21±2.3
	6	10±2.3	13±1.5	17±1.6
硅烷偶联剂	2	11±1.5	13±1.8	14±2.3
	4	13±2.5	8±2.3	12±1.8
	6	16±2.2	14±2.2	17±1.9
NaOH	2	37±1.7	39±1.9	43±1.5
	4	43±2.2	41±2.4	46±1.6
	6	37±2.1	36±1.6	39±2.2

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