Preparation of hydroxyl functionalized ACR and its application in PBT modification

doi:10.19491/j.issn.1001-9278.2024.09.003

Abstract

Abstract:

Hydroxy⁃functionalized polyacrylate rubber particles （ACR⁃OH） were synthesized with micro⁃crosslinked polybutyl acrylate （PBA） as a rubber core and methyl methacrylate⁃hydroxyethyl acrylate copolymer （HEA） as a shell through seed emulsion polymerization. ACR⁃OH was mixed with triglycidyl isocyanurate （TGIC） and then added into polybutylene terylene phthalate （PBT）. Owing to the reactions occurring between the hydroxyl groups on the surface of ACR particles and epoxy groups in TGIC and between the epoxy groups in TGIC and hydroxyl end⁃group of PBT in the melt blending process， the modified PBT （PBT/TGIC/ACR⁃OH） gained the good compatibility between ACR and PBT. The effect of the addition of ACR⁃OH and TGIC on the impact strength and tensile strength of the modified PBT were investigated. The results indicated that the addition of ACR⁃OH effectively improved the toughness of PBT due to good compatibility. When the addition amounts of ACR⁃OH and TGIC were 20 and 2 phr， respectively， the impact strength of the modified PBT reached 20.45 kJ/m²， which was 8.4 times as high as that of pure PBT （2.43 kJ/m²）. Moreover， with the help of multi⁃functional TGIC， the modified PBT exhibited both good toughness and good strength at addition amounts of ACR⁃OH and TGIC of 8 and 2 phr， respectively. Its impact strength and tensile strength reached 10.87 kJ/m² and 42.1 MPa， respectively.

Key words: emulsion polymerization, hydroxy?functionalized polyacrylate rubber particles, polybutylene terylene phthalate, compatibility, impact strength, tensile strength

CLC Number:

TQ323.4⁺1

MA Jianxin, WANG Guoliang, DU Zhongjie, WANG Wucong, JIN Hua, ZOU Wei, WANG Hong, ZHANG Chen. Preparation of hydroxyl functionalized ACR and its application in PBT modification[J]. China Plastics, 2024, 38(9): 14-19.

Figures/Tables 9

FIG.1. The reaction among ACR⁃OH， PBT and TGIC

名称	种子/g	核层/g	壳层/g
BA	5	30	-
MMA	-	-	15
AMA	0.2	1.2	-
APS	0.05	0.35	0.1
SDS	0.4	-	-
OP⁃10	0.1	-	-
碳酸氢钠	0.05	-	-
去离子水	100	-	-
HEA	-	-	3

Tab.1. ACR⁃OH emulsion polymerization formula

样品编号	PBT/份	ACR⁃OH/份	TGIC/份	抗氧剂1010/份
PBT⁃0	100	0	2	0.3
PBT⁃1	100	3	2	0.3
PBT⁃2	100	5	2	0.3
PBT⁃3	100	8	2	0.3
PBT⁃4	100	12	2	0.3
PBT⁃5	100	20	2	0.3
PBT⁃6	100	8	0	0.3
PBT⁃7	100	8	1	0.3
PBT⁃8	100	8	3	0.3

Tab.2. Blending table of PBT/ACR⁃OH/TGIC

Fig.2. Distribution of emulsion particle size after different polymerization stages

Fig.3. TEM image （a） and FTIR spectrum （b） of ACR⁃OH

Fig.4. Mechanical properties of the modified PBT with different ACR⁃OH addition

Fig.5. Fracture surface morphology of PBT with different ACR⁃OH addition

Fig.6. Mechanical strength of composites with different TGIC addition amounts

FIG.7. Fracture surface morphology of PBT with different TGIC addition

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