Dynamic mechanical properties, crystallization behaviors, and low‐temperature performance of polypropylene random copolymer composites

Yin, Xinbao; Wang, Lijun; Zhang, Chun; Gong, Wei; He, Li

doi:10.1002/app.42960

Cited by 11 publications

(9 citation statements)

References 45 publications

(70 reference statements)

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“…Enhancing the impact properties of iPP has been successfully fulfilled by introducing rubber phase into iPP matrix . That is due to the fact that the cavitation, shear yielding, and crazing are the main toughening mechanisms in iPP blends . The cavitation could be easily activated in the blended system resulting in toughening material.…”

Section: Application Of Cavities In Semi‐crystalline Polymersmentioning

confidence: 99%

Cavitation‐Induced Stress Whitening in Semi‐Crystalline Polymers

Men

2018

Macro Materials & Eng

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Cavitation‐induced stress whitening in semi‐crystalline polymers during stretching significantly influences the physical properties of the materials. This review summarizes studies focusing on two different cavitation processes triggered at small and large strain regimes. The corresponding mechanisms of these two cavitation processes are discussed. For cavitation activated at small strain, there are two basic but distinctly different models with the initiation of cavities either in the amorphous phase or in the crystalline skeleton. For the cavitation triggered at a large strain regime, there are also two different arguments being either due to the defects located in the ends of micro‐fibrils or as a consequence of the fragmentation of load‐bearing inter‐fibril/micro‐fibril tie chains in highly oriented amorphous networks. A unified understanding of the cavitation processes during stretching semi‐crystalline polymers based on interpenetrated network model is proposed. Finally, this review outlooks future research topics for better understanding the cavitation mechanism to meet the industrial need.

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Section: Application Of Cavities In Semi‐crystalline Polymersmentioning

confidence: 99%

Cavitation‐Induced Stress Whitening in Semi‐Crystalline Polymers

Men

2018

Macro Materials & Eng

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“…The extrusion temperature profile from the hopper to nozzle was 165–175 °C, and the expansion ratio was kept at a constant, and controlled by the thickness of the sample expanding from 3.5 to 4.0 mm. In this study, the masterbatch and activator were used at 10 and 5 wt % levels, respectively [11,21].…”

Section: Methodsmentioning

confidence: 99%

“…As a result, microfoamed polymer materials have been widely used in transportation, the military industry, aerospace, electronics, daily necessities, and so on [7,8,9,10]. When the microfoamed polymer materials are used as structural materials, the comprehensive properties of the materials need to be higher, especially the mechanical properties, because the foamed materials have a certain weight loss [8,11]. Generally, the mechanical properties of the microfoamed polymer structural materials are mainly determined by the morphology of cells in the material, such as the shape, diameter, density, and distribution of the cells [11,12].…”

Section: Introductionmentioning

confidence: 99%

“…When the microfoamed polymer materials are used as structural materials, the comprehensive properties of the materials need to be higher, especially the mechanical properties, because the foamed materials have a certain weight loss [8,11]. Generally, the mechanical properties of the microfoamed polymer structural materials are mainly determined by the morphology of cells in the material, such as the shape, diameter, density, and distribution of the cells [11,12]. Therefore, further study of the foaming quality and mechanical properties, such as the impact property of the microfoamed polymer materials, is worthwhile.…”

Section: Introductionmentioning

confidence: 99%

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Study on Foaming Quality and Impact Property of Foamed Polypropylene Composites

Gong

Zhang

et al. 2018

Polymers

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In the present work, foamed polypropylene (PP) composites were prepared by chemical foaming technology, and the foaming quality and impact property of the foamed PP composites were studied. The results showed that the foaming quality was significantly improved after the introduction of thermoplastic rubber (TPR) and polyolefin elastomer (POE). Meanwhile, it was found that the impact property depended on the intrinsic toughness and contribution of foams (cells) to the PP composites. Furthermore, the data regarding impact property in low temperature showed that when the temperature was between −80 and −20 °C, the impact properties of the foamed PP composites were higher than that of the unfoamed sample, which was due to the impact property being completely contributed by cells under this condition. Meanwhile, when the temperature ranged from −20 to 20 °C, the impact property of the unfoamed sample was higher, which was due to the PP matrix contributing more to the impact property under this temperature. This work significantly improved the foaming quality of foamed PP composites and provided reliable evidence for the improvement of impact property.

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“…Several physical methods were used frequently. One of the most frequently utilized method is physically blending with elastomers, including polydimethylsiloxane (PDMS) , ethylene‐octene copolymer (POE) , styrene‐butadiene‐styrene triblock copolymer (SBS) , styrene‐hydrogenated butadiene‐styrene triblock copolymer (SEBS) , ethylene‐propylene‐diene terpolymer (EPDM) , and so on . Fillers and fibers, such as graphene , CaCO 3 , SiO 2 nanoparticles , and glass fibers , also have been introduced to toughen polymer matrix.…”

Section: Introductionmentioning

confidence: 99%

Improvement in Low Temperature Izod Impact Strength of SAN/ASA/HNBR Ternary Blends Considering Competing Effects of Glass Transition Temperature and Compatibility

Mao

Zhang

2018

Vinyl Additive Technology

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The competing effects of glass transition temperature (T g ) and compatibility on the low temperature Izod impact toughness of styrene-acrylonitrile copolymer/ acrylonitrile-styrene-acrylate terpolymer (SAN/ASA, 75/25, w/w) blends were investigated by using a series of hydrogenated nitrile butadiene rubbers (HNBRs) with different acrylonitrile (AN) contents. The results showed that the HNBR with AN mass content ranging from 21% to 43% had good compatibility with polymer matrix and exhibited dramatic toughening effect at 25 C. Owing to their low T g s, only the HNBRs (AN = 21% and 25%) remained favorable toughening effect at 0 and −30 C, respectively. Furthermore, the HNBR with 0% AN content was represented by butadiene rubber (BR). Although, BR has an extremely low T g (−94.5 C), it is incompatible with polymer matrix, and then could not toughen the material at three temperatures (−30, 0, and 25 C, respectively). Various characterizations including solubility parameters, scanning electron microscopy (SEM), dynamic mechanical thermal analysis (DMTA), Fourier transform infrared (FTIR) spectroscopy, and so on were carried out to elucidate the toughening mechanism.

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Dynamic mechanical properties, crystallization behaviors, and low‐temperature performance of polypropylene random copolymer composites

Cited by 11 publications

References 45 publications

Cavitation‐Induced Stress Whitening in Semi‐Crystalline Polymers

Cavitation‐Induced Stress Whitening in Semi‐Crystalline Polymers

Study on Foaming Quality and Impact Property of Foamed Polypropylene Composites

Improvement in Low Temperature Izod Impact Strength of SAN/ASA/HNBR Ternary Blends Considering Competing Effects of Glass Transition Temperature and Compatibility

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