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Polymers (Basel). 2018 Dec 26;11(1). pii: E29. doi: 10.3390/polym11010029.

Synergetic Toughening Effect of Carbon Nanotubes and β-Nucleating Agents on the Polypropylene Random Copolymer/Styrene-Ethylene-Butylene- Styrene Block Copolymer Blends.

Author information

1
School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China. rengpg@126.com.
2
School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China. 18149219745@163.com.
3
Department of Applied Chemistry, School of Science, and Shaanxi Key Laboratory of Macromolecular Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China. fanqian1211@mail.nwpu.edu.cn.
4
Department of Applied Chemistry, School of Science, and Shaanxi Key Laboratory of Macromolecular Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China. 19802013040@163.com.
5
Department of Applied Chemistry, School of Science, and Shaanxi Key Laboratory of Macromolecular Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China. xg1593572468@163.com.
6
College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China. yandingxiang@scu.edu.cn.
7
Department of Applied Chemistry, School of Science, and Shaanxi Key Laboratory of Macromolecular Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China. yanhuichen@nwpu.edu.cn.

Abstract

Polypropylene random co-polymer (PPR)/styrene-ethylene-butylene-styrene (SBS) block copolymer blends with high toughness and favorable tensile properties were successfully obtained by blending with traces of multi-wall carbon nanotubes (MWCNTs) and β-nucleating agents (β-NAs). β-NAs can effectively induce the ductile β-form crystal in the PPR matrix. Although the addition of MWCNTs was reported to be only benefit for the tensile strength of PPR and relatively disadvantageous for the toughness, the obviously synergistic toughening effect in PPR/SBS blends was found when MWCNTs and β-NAs coexisted. The notched izod impact strength of PPR/30 wt % SBS blend with MWCNTs and β-NAs increased from 11.3 to 58.9 kJ/m²; more than 5-fold increment compared with pure PPR. Meanwhile, the tensile strength retention of this PPR blend is still above 72.2%. The micro-morphology indicated that the MWCNTs can act as bridges between SBS particle and PPR matrix, effectively transferring the stress and absorbing impact energy among SBS particles.

KEYWORDS:

multi-wall carbon nanotubes; polypropylene random copolymer; styrene-ethylene-butylene-styrene block copolymer; synergetic toughening; β-nucleating agents

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