The crystallization behaviors and rheological properties of polypropylene/graphene nanocomposites: The role of surface structure of reduced graphene oxide

Yang, Chen; Yin, Qing; Zhang, Xumin; Xue, Xiangxin

doi:10.1016/j.tca.2018.01.021

Cited by 26 publications

(16 citation statements)

References 53 publications

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“…The crystallization peak temperatures of neat PP and GO/PP are 104.1 and 104.9 °C, respectively. However, the peak shifts to 105.2, 107.0 and 107.5 °C for RGOA/PP, RGOB/PP and RGOH/PP, respectively, indicating the strong heterogeneous nucleation effect of rGO, which promotes the crystallization of PP during cooling . It is noticeable that with an increase of C/O ratio of rGO, both the crystallization peak temperature and X c (Table ) of rGO/PP nanocomposites increase.…”

Section: Resultsmentioning

confidence: 95%

“…Thus, an increased amount of O‐‐C=O was observed in RGOA . It can be inferred that GO reduced by N 2 H 4 suffers a greater removal of oxygen functional groups and the reconstruction of sp 2 structure of carbon atoms on the surface of rGO …”

Section: Resultsmentioning

confidence: 99%

“…Afterwards, they were cooled to 20 °C at a rate of 20 °C min −1 and were reheated to 200 °C with heating rate of 20 °C min −1 . The degree of crystallinity ( X c ) was determined out as follows:

X_{normalc} = \frac{Δ H_{normalPP}}{Δ H_{normalPP}^{*} ω} \times 100 %

<NI>where

Δ H_{normalPP}^{*}

(209 J g −1 ) is the melting enthalpy of 100% crystalline PP, Δ H PP is the melting enthalpies of the samples evaluated from the DSC heating thermograms and ω is the weight fraction of PP in the nanocomposites.…”

Section: Methodsmentioning

confidence: 99%

“…demonstrated that GNs could serve as seeds for heterogeneous nucleation and facilitate the crystallization of PP matrix. In our recent study, it was found that the degree of crystallization of PP nanocomposites increased and the non‐Newtonian behavior became stronger with an increase of the extent of reduction of rGO. However, to the best of our knowledge, the effects of surface structures of rGO on the mechanical properties, thermal stability and thermal conductivity of PP have not yet been studied thoroughly, which are of significance for developing rGO/PP nanocomposites with excellent thermal and mechanical performances.…”

Section: Introductionmentioning

confidence: 91%

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Effect of oxygen functional groups of reduced graphene oxide on the mechanical and thermal properties of polypropylene nanocomposites

Xue

Chen

Yin

et al. 2018

Polymer International

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Reduced graphene oxide (rGO) with various surface structures was prepared by reducing graphene oxide (GO) with hydrazine hydrate (N 2 H 4 ), sodium borohydride (NaBH 4 ) and L-ascorbic acid, respectively. The resulting rGO were used to fabricate rGO/polypropylene (PP) nanocomposites by a melt-blending method. The surface structure of rGO as well as multifunctional properties of rGO/PP nanocomposites were thoroughly investigated. It was shown that rGO with highest C/O ratio could be obtained by reducing GO with N 2 H 4 . The crystallization behaviors, tensile strength, thermal conductivity and thermal stability of rGO/PP nanocomposites were significantly improved with the increase of C/O ratio of rGO. For example, with only 1 phr (parts per hundred PP) rGO reduced by N 2 H 4 , the degree of crystallinity, tensile strength, maximum heat decomposition temperature and thermal conductivity of PP nanocomposite were increased by 6.2%, 20.5%, 48.0 ∘ C and 54.5%, respectively, compared with those of pure PP. Moreover, the thermal degradation kinetics indicated that the decomposition activation energy of rGO/PP nanocomposites could be enhanced by adding rGO with higher C/O ratio.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

X_{normalc} = \frac{Δ H_{normalPP}}{Δ H_{normalPP}^{*} ω} \times 100 %

<NI>where

Δ H_{normalPP}^{*}

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 91%

See 2 more Smart Citations

Effect of oxygen functional groups of reduced graphene oxide on the mechanical and thermal properties of polypropylene nanocomposites

Xue

Chen

Yin

et al. 2018

Polymer International

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“…O polipropileno (PP) consiste em um polímero termoplástico semicristalino do grupo das poliolefinas, ou seja, contém apenas hidrogênio e carbono na composição de suas macromoléculas (CHEN et al, 2018), sendo um dos polímeros mais utilizados na indústria de um modo geral e possui grande diversidade de aplicações, desde embalagens rígidas e flexíveis até produtos injetados para os mais variados tipos de utilização (NASCIMENTO et al, 2013).…”

Section: Materiais Poliméricosunclassified

Determinação das curvas de carga do polipropileno deformado via técnica de prensagem em canais equiangulares

Santos

Medeiros

2020

BJD

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RESUMOO objetivo deste estudo é determinar as curvas de carga do polímero termoplástico polipropileno deformado a partir da técnica de prensagem em canais equiangulares, PCEA, através de diferentes rotas de processamento e temperaturas de ensaio. Foram realizados quatro passes de deformação considerando-se as rotas A e B, que são determinadas de acordo com o sentido de rotação da amostra entre os passes de prensagem durante os ensaios, sendo que na rota A as amostras não sofrem rotação e na rota B, a partir de B A e B C , há rotações de 90º alternadas para B A e no mesmo sentido para B C . Ainda, as temperaturas de 25 °C e 90 °C, sendo esta última correspondente a 50% da temperatura de fusão do polipropileno, foram consideradas para os testes via PCEA. Os resultados mostraram que as deformações aplicadas sofreram influência da temperatura de processamento e a rota A obteve os maiores valores de carga máxima em relação às rotas B A e B C a 25 ºC apresentando amostras com maiores distorções. Palavras-chave: Prensagem em canais equiangulares, Rotas de processamento, Polímeros, PolipropilenoBrazilian Journal of Development Braz. ABSTRACTThe objective of this study is performing ECAP tests (equal channel angular pressing) about the polypropylene thermoplastic polymer in order to determinate their load curves through different processing routes and temperatures. Four passes were performed the deformation which considerate A and B routes which are determined according to the direction of sample rotation during tests. On route A the samples don't rotate but on route B, from B A and B C , there are 90° rotations alternating for B A and in the same direction for B C route. Also, temperatures of 25 °C and 90 °C, which the last one is the half of melting polypropylene temperature, were considered for the ECAP tests. The results showed that the applied deformations were influenced by the processing temperature and the route A obtained the highest values of maximum load in relation to the others routes B A and B C at 25 ºC and presented samples with higher distortions.

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Rheological behavior of poly(propylene) reinforced with graphene nanoplatelets for injection molding

Lima

Silva

Trindade

et al. 2022

J of Applied Polymer Sci

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Poly(propylene) (PP)‐based graphene nanoplatelets (GnPs) nanocomposites are processed by a melt blending technique. To obtain more knowledge about the rheological behavior of nanocomposites for injection molding, the rheological characterization of nanocomposites is performed using a double capillary rheometer over a shear rate range from 10 to 6000 s−1. The influence of processing temperature (170, 180, and 190°C) is evaluated. To improve the interaction between PP and GnPs, maleic anhydride (MA) is applied as a compatibilizer. The viscosity master curves are fitted to the Cross‐WLF model. In relation to neat PP, the presence of GnPs promote a viscosity decrease. The nanocomposites containing MA exhibit a higher viscosity than the non‐compatibilized counterparts, suggesting adhesion improvement between PP and GnPs. In addition to the MA compatibilizer effect, the results show that its presence could act as a plasticizer/lubricant in the PP matrix. The morphology characterization of nanocomposites suggests that in addition to improving the adhesion between PP and GnPs, the MA presence also improved the GnPs dispersion in the PP matrix. The presence of GnPs and MA can affect the Newtonian behavior of the PP matrix. All studied samples reveal thermo‐rheological simplicity and pseudo‐plastic behavior.

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The crystallization behaviors and rheological properties of polypropylene/graphene nanocomposites: The role of surface structure of reduced graphene oxide

Cited by 26 publications

References 53 publications

Effect of oxygen functional groups of reduced graphene oxide on the mechanical and thermal properties of polypropylene nanocomposites

Effect of oxygen functional groups of reduced graphene oxide on the mechanical and thermal properties of polypropylene nanocomposites

Determinação das curvas de carga do polipropileno deformado via técnica de prensagem em canais equiangulares

Rheological behavior of poly(propylene) reinforced with graphene nanoplatelets for injection molding

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