SEBS与β-NAs对PP的协同增韧作用及增韧机理研究

doi:10.11896/cldb.23050100

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Abstract In this work,using polypropylene (PP) as the matrix,hydrogenated styrene-butadiene block copolymer (SEBS) and β nucleating agents (β-NAs) as toughening agents,PP/SEBS/β-NAs blends were prepared by melt blending method. The synergistic toughening effect of SEBS and β-NAs on PP,and the toughening mechanism were investigated. The results showed that the impact strength of the obtained PP/SEBS/β-NAs blends reached 76.1 kJ/m² at 20% SEBS and 0.05% β-NAs,which was 1 851.3% higher than that of pure PP (3.9 kJ/m²). The synergistic effect of SEBS and β-NAs not only toughened PP,but also improved the processing properties. The addition of β-NAs induced an earlier brittle-tough transition behaviour of the obtained PP/SEBS/β-NAs blends at low SEBS content. The toughening mechanism could be explained that due to the addition of β-NAs,most of the α crystals in the PP/SEBS/β-NAs blends were converted into β crystals,resulting in a finer size of PP grains,smaller size and more uniform dispersion of the SEBS phases. The SEBS phases acted as the stress concentration points,which not only cavitated inside the SEBS phase and the interface layer between the SEBS phase and PP,but also induced a large amount of shear yield deformation of the PP matrix in the sample,and these processes absorbed a large amount of energy,giving the PP/SEBS/β-NAs blends good toughness.

Key words： polypropylene toughening impact strength toughening mechanism

Published: 25 June 2024 Online: 2024-07-17

CLC number:

TQ325.1+4

Fund:Research, Development and Industrial Application of Medical Polyolefin Series Products (2018E-19-02).

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	LI Shushu
	CHENG Pengfei
	MA Yingxia
	LI Guangquan

Cite this article:

LI Shushu,CHENG Pengfei,MA Yingxia, et al. Synergistic Toughening Effect of SEBS and β-NAs on PP and the Toughening Mechanism[J]. Materials Reports, 2024, 38(12): 23050100-8.

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http://www.mater-rep.com/EN/10.11896/cldb.23050100 OR http://www.mater-rep.com/EN/Y2024/V38/I12/23050100

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