Effect of hybrid reinforcement of nanoclay and silica on properties of poly（lactic acid）

doi:10.19491/j.issn.1001-9278.2024.07.008

Abstract

Abstract:

PLA was adopted as a polymeric matrix to prepare PLA/nanoclay composites. The effect of the amount of nanoclay together with 2 phr SiO₂ as a hybrid reinforcement on the structures and properties of the composites were investigated. The results indicated that the crystallization behaviors， melt processability， mechanical toughness， and gas barrier property of the PLA composites were significantly improved. The PLA composite with 2 phr SiO₂ and 4 phr clay exhibited good filler dispersion， ductile fracture， and good gas barrier property. Compared to pure PLA， the PLA composites presented an increase in elongation at break by 151 % and in impact strength by 74.1 %. Their oxygen and water vapor permeability coefficients were reduced by 67.4 % and 65.0 %， respectively. The excessive amount of clay was disadvantageous to the toughness and also generated a slightly influence on gas barrier.

Key words: poly（lactic acid）, hybrid reinforcement, mechanical property, gas barrier property

CLC Number:

TQ323

WANG Jie, XIN Dehua, LI Hui, JIANG Hongshi, ZHOU Hongfu, ZHAO Jianguo. Effect of hybrid reinforcement of nanoclay and silica on properties of poly（lactic acid）[J]. China Plastics, 2024, 38(7): 43-48.

Figures/Tables 7

样品名称	PLA含量	黏土含量	SiO₂含量	扩链剂含量
PLA	100	0	0	0.5
PLA0	100	0	2	0.5
PLA2	100	2	2	0.5
PLA4	100	4	2	0.5
PLA6	100	6	2	0.5
PLA8	100	8	2	0.5

Tab.1. Experimental formulas for different PLA composites phr

Fig.1. SEM of PLA composites

Fig.2. TEM of PLA composites

Fig.3. PLM of PLA composites

Fig.4. Rotational rheological curves of PLA composites

Fig.5. Effect of the fillers on the tensile and impact properties of PLA composites

Fig.6. Effect of the fillers on gas barrier properties of PLA composites films

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