Synergistic Strengthening-Toughening Modification of Polypropylene with Functional Graphene/Halloysite Nanotubes

doi:10.11901/1005.3093.2018.664

Chinese Journal of Materials Research

2019, Vol. 33

Issue (7): 505-514 DOI: 10.11901/1005.3093.2018.664

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Synergistic Strengthening-Toughening Modification of Polypropylene with Functional Graphene/Halloysite Nanotubes

Zhengjun WANG¹,Hongcai LIU¹,Yi GUO¹,Jun BIAN¹(

),Jianbao LI¹,Hailan LIN¹(

),Yun LU²

1. College of Materials Science and Engineering, Xihua University, Chengdu 610039, China
2. Department of Mechanical Engineering, Graduate School of Science and Engineering, Chiba University, Chiba 262-8522, Japan

Cite this article:

Zhengjun WANG,Hongcai LIU,Yi GUO,Jun BIAN,Jianbao LI,Hailan LIN,Yun LU. Synergistic Strengthening-Toughening Modification of Polypropylene with Functional Graphene/Halloysite Nanotubes. Chinese Journal of Materials Research, 2019, 33(7): 505-514.

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Abstract

Nanocomposites of GO@HNTs/PP were prepared through melt blending method with polypropylene (PP) as matrix and hybrid nanofillers (GO@HNTs) composed of functionalized graphene oxide (GO) and halloysite nanotubes (HNTs) as filler. The structures and properties of the prepared hybrid nanofillers and PP nanocomposites were systematically investigated. Results show that there is chemical interactions between functionalized GO and HNTs, resulting in formation a "barrier effect" between them and inhibit the aggregation of the two species in the PP matrix. The tensile strength and impact strength of PP nanocomposites with 0.5% GO@HNTs hybrid nano-filler increased by 17.5% and 80.4%, respectively, compared with those of pure PP. Compared with the mechanical properties of composites prepared by adding the same content GO or HNTs alone, GO@HNTs hybrid nano-filler had obvious synergistic strengthening-toughening effect on the PP matrix. GO@HNTs/PP exhibited higher storage modulus, loss modulus and glass transitional temperatures than those of pure PP. The crystallization temperature, melting temperature, crystallinity and thermal decomposition temperature of PP nanocomposites are effectively increased due to the “heterogeneous nucleation effect” and “physical insulation effect” of GO@HNTs.

Key words: Composite Polypropylene (PP) Graphene Halloysite Nanotube (HNTs) Properties

Received: 19 November 2018

ZTFLH:

TQ325.1+4

Fund: Cooperation Project of Chunhui Plan of the Ministry of Education of China(Z2018088);Cooperation Project of Chunhui Plan of the Ministry of Education of China(Z2017070);Open Research Project of Comprehensive Health Promotion Center of Xihua University(DJKG2019-002);“Xihua Cup” Innovation and Entrepreneurship Project for College Students of Xihua University(2019051);the Comprehensive Reform and Practical Teaching Team Project of "Material Discipline" under Innovative and Entrepreneurial Environment(05050028)

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	Zhengjun WANG
	Hongcai LIU
	Yi GUO
	Jun BIAN
	Jianbao LI
	Hailan LIN
	Yun LU

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https://www.cjmr.org/EN/10.11901/1005.3093.2018.664 OR https://www.cjmr.org/EN/Y2019/V33/I7/505

Fig.1 UV-vis absorption spectra of GO (0.05 mg/mL), GO-g-TA (0.05 mg/mL), HNTs (0.05 mg/mL), GO@HNTs hybrid nanofillers (0.05 mg/mL), and the theoretical value of absorption intensity of GO@HNTs hybrid nanofillers solution simulated by linear superposition relation

Fig.2 FTIR spectra of the NGP, GO, GO-g-TA, HNTs, and the GO@HNTs hybrid nanofillers

Fig.3 Raman spectra of the NGP, GO, GO-g-TA, HNTs, and the GO@HNTs hybrid nanofillers

Fig.4 XRD profiles of (a) the NGP and GO; (b) GO-g-TA, HNTs and the GO@HNTs hybrid nanofillers

Fig.5 SEM images of fillers. (a) HNTs, (b) GO, (c) GO-g-TA and (d) the GO@HNTs hybrid nanofillers

Fig.6 SEM images of (a) pure PP, (b) HNTs/PP, (c) GO/PP, (d-g) GO@HNTs/PP nanocomposites with 0.25, 0.5, 1.0 and 2.0% GO@HNTs hybrid nanofillers

Fig.7 XRD traces of pure PP and GO@HNTs/PP nanocomposites with different contents of GO@HNTs hybrid nanofillers

Fig.8 The typical mechanical properties of PP nanocomposites (1^#-PP; 2^#-0.25%GO@HNTs/PP; 3^#-0.5GO@HNTs/PP; 4^#-1.0%GO@HNTs/PP, 5^#-2.0%GO@HNTs/PP, 6^#-0.5%GO/PP, 7^#-0.5%HNTs/PP)

Fig.9 Dynamic mechanical properties of all the PP samples: (a) storage modulus (E′), (b) loss mo-dulus (E" ) and (c) loss factor

Table 1 The TGA results of pure PP and GO@HNTs/PP na-nocomposites

Fig.10 DSC cooling (a), heating (b) and (c) variation of crystallinity and increasement of crystallin-ity of GO@HNTs/PP nanocomposites with different contents of GO@HNTs hybrid nano-fillers. Curve a-pure PP; curves b, c, d and e are GO@HNTs/PP nanocomposites containing 0.25%, 0.5%, 1.0% and 2.0% GO@HNTs hybrid nanofillers

Table 2 The DSC results of pure PP and GO@HNTs/PP na-nocomposites

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