Preparation and Properties of Highly Toughened Poly（lactic acid）/ Ethylene-Butyl Acrylate-Glycidyl Methacrylate Graft Copolymer Blends

doi:10.19894/j.issn.1000-0518.230345

Chinese Journal of Applied Chemistry ›› 2024, Vol. 41 ›› Issue (4): 529-537.DOI: 10.19894/j.issn.1000-0518.230345

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Preparation and Properties of Highly Toughened Poly（lactic acid）/ Ethylene-Butyl Acrylate-Glycidyl Methacrylate Graft Copolymer Blends

Zheng ZHOU, Yi-Wei XIA, Jie JIN, Song-Qi ZHENG, Si-Yu ZHOU, Gui-Yan ZHAO()

School of Petrochemical Engineering，Liaoning Petrochemical University，Fushun 113001，China

Received:2023-11-02 Accepted:2024-03-12 Published:2024-04-01 Online:2024-04-28
Contact: Gui-Yan ZHAO
About author:gyzhao@lnpu.edu.cn
Supported by:
the Scientific Research Fund of Liaoning Provincial Education Department(LJKMZ20220733)

1. Preparation and Properties of Highly Toughened Poly(lactic acid)/Ethylene-butyl acrylate-glycidyl methacrylate graft copolymer Blends.pdf(314KB)

Abstract

Abstract:

This article introduces a catalyst，（N，N-dimethyl-octadecylamine， DMSA）， into the blend of poly（lactic acid）（PLA） and ethylene-butyl acrylate-glycidyl methacrylate graft copolymer （EBA-GMA）， to improve the impact toughness of the PLA/EBA-GMA （70/30） blend system through the promotion of in-situ reaction between PLA and EBA-GMA. The influence of DMSA content on the mechanical properties of the blend system was investigated. The results show that the impact strength of the PLA/EBA-GMA （70/30） blend without DMSA is only 10.9 kJ/m². When the content of DMSA is 0.5%， the impact strength of the PLA/EBA-GMA （70/30） blend reaches as high as 63.1 kJ/m². Structural and morphological characterizations indicate that the addition of a small amount of DMSA effectively promotes the reactivity between epoxy groups on EBA-GMA and terminal groups of PLA， thereby enhancing the impact toughness of the PLA/EBA-GMA blend.

Key words: Poly（lactic acid）, Ethylene-butyl acrylate-glycidyl methacrylate graft copolymer, Catalyst, Toughening

CLC Number:

O631

Zheng ZHOU, Yi-Wei XIA, Jie JIN, Song-Qi ZHENG, Si-Yu ZHOU, Gui-Yan ZHAO. Preparation and Properties of Highly Toughened Poly（lactic acid）/ Ethylene-Butyl Acrylate-Glycidyl Methacrylate Graft Copolymer Blends[J]. Chinese Journal of Applied Chemistry, 2024, 41(4): 529-537.

Figures/Tables 11

Fig.1 FT-IR spectra of PLA/EBA-GMA/DMSA （70/30） blends with different DMSA contents

Fig.2 SEM images for cryo-fractured surfaces of PLA/EBA-GMA/DMSA（70/30） blends with different mass fraction of DMSA

Fig.3 SEM images of PLA/EBA-GMA/DMSA （70/30） blends with different mass fraction of DMSA after etching the cryo-fracture surface

Table 1 Particle size of the dispersed phase in PLA/EBA-GMA/DMSA （70/30） blend system before and after DMSA addition

Sample	w（DMSA）/%	D_n/μm	Impact strength/（kJ·m^-2）
PLA/EBA-GMA（70/30）	0	40.9	10.9
	0.1	28.8	39.2
	0.2	12.7	44.9
	0.5	9.2	63.1

Fig.4 Tanδ curves of PLA/EBA-GMA （70/30） blends with different DMSA contents as a function of temperature

Table 2 Tg of each component in PLA/EBA-GMA （70/30） blends with different mass fraction of DMSA

Sample	w（DMSA）/%	T_g1/℃	T_g2/℃	ΔT_g/℃
PLA/EBA?GMA（70/30）	0	-44.1	66.9	111.0
	0.1	-38.7	65.8	104.5
	0.2	-35.7	65.7	101.4
	0.3	-32.7	66.0	98.7
	0.5	-34.5	64.5	99.0

Fig.5 Impact strength as a function of EBA-GMA content of PLA/EBA-GMA blends without DMSA

Fig.6 Impact strength of PLA/EBA-GMA （70/30） blends as function of the mass fraction of DMSA

Table 3 Tensile properties of PLA/EBA-GMA （70/30） blends with different mass fraction of DMSA

Samples	w（DMSA）/%	Tensile strength/MPa	Elongation at break/%	Tensile modulus/GPa
PLA		76.3±0.7	8.8±0.0	2.1±0.2
PLA/EBA-GMA （70/30）	0	32.5±0.5	20.7±1.0	1.3±0.1
PLA/EBA-GMA （70/30）	0.1	29.7±1.1	24.1±0.6	1.1±0.1
PLA/EBA-GMA （70/30）	0.2	24.5±1.0	17.5±1.3	0.9±0.1
PLA/EBA-GMA （70/30）	0.3	24.1±1.2	18.4±0.5	0.8±0.1
PLA/EBA-GMA （70/30）	0.5	19.6±1.4	21.4±1.9	0.5±0.2

Fig.7 Schematic diagram of the morphology evolution of PLA/EBA-GMA （70/30） blends with adding catalyst DMSA

Fig.8 The possible reactions in PLA/EBA-GMA （70/30） blends with DMSA addition

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Preparation and Properties of Highly Toughened Poly（lactic acid）/ Ethylene-Butyl Acrylate-Glycidyl Methacrylate Graft Copolymer Blends

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