Toughening with little rigidity loss and mechanism for modified polypropylene by polymer particles with core–shell structure

Chen, Feng; Shangguan, Yonggang; Jiang, Yishu; Qiu, Biwei; Luo, Guohang; Zheng, Qiang

doi:10.1016/j.polymer.2015.03.064

Cited by 54 publications

(32 citation statements)

References 72 publications

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“…Since the mechanical properties, especially the fracture toughness of the blends are related to glass transition behavior and crystallization ability of second component, it is necessary to investigate thermal behavior of SEEPS in detail. Figure (a) shows dynamic mechanical analysis (DMA) curves of SEEPS and EPR.…”

Section: Resultsmentioning

confidence: 99%

“…For most of rubber toughened thermoplastic resins, the impact strength increases with rubber content, but the tensile strength and elastic modulus inevitably decrease with increasing rubber content due to the low strength and modulus of rubber . Therefore, much effort has been made to achieve the balance between rigidity and toughness in rubber toughened thermoplastic resins.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of polypropylene blends with excellent low‐temperature toughness and balanced toughness‐rigidity by a combination of EPR and SEEPS

Jia

Shangguan

Xiong

et al. 2017

J of Applied Polymer Sci

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To overcome serious rigidity depression of rubber‐toughened plastics and fabricate a rigidity‐toughness balanced thermoplastic, a combination of styrene‐[ethylene‐(ethylene‐propylene)]‐styrene block copolymer (SEEPS) and ethylene‐propylene rubber (EPR) was used to toughen polypropylene. The dynamic mechanical properties, crystallization and melting behavior, and mechanical properties of polypropylene (PP)/EPR/SEEPS blends were studied in detail. The results show that the combination of SEEPS and EPR can achieve the tremendous improvement of low‐temperature toughness without significant strength and rigidity loss. Dynamic mechanical properties and phase morphology results demonstrate that there is a good interfacial strength and increased loss of compound rubber phase comprised of EPR component and EP domain of SEEPS. Compared with PP/EPR binary blends, although neither glass transition temperature (Tg) of the rubber phase nor Tg of PP matrix in PP/EPR/SEEPS blends decreases, the brittle‐tough transition temperature (Tbd) of PP/EPR/SEEPS blends decreases, indicating that the increased interfacial interaction between PP matrix and compound rubber phase is also an effective approach to decrease Tbd of the blends so as to improve low‐temperature toughness. The balance between rigidity and toughness of PP/EPR/SEEPS blends is ascribed to the synergistic effect of EPR and SEEPS on toughening PP. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45714.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fabrication of polypropylene blends with excellent low‐temperature toughness and balanced toughness‐rigidity by a combination of EPR and SEEPS

Jia

Shangguan

Xiong

et al. 2017

J of Applied Polymer Sci

Self Cite

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“…Various toughening strategies were used over last 30 years [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. In rubber toughened polymers, the enhanced fracture toughness is usually offset by the reduced elastic modulus, enhanced creep compliance and reduced high temperature properties [5].…”

Section: Introductionmentioning

confidence: 99%

“…It has also been shown that addition of small volume fraction of short deformable fibers can enhance fracture toughness of brittle polymers at high strain rates, substantially [21]. Toughening of polymers with preformed core-shell inclusions [3,22,23] suggests that dispersing a small amount of deformable rigid core-soft shell (RCSS) inclusions may provide the desired improvement of low temperature toughness while preserving the hight temperature properties [15,17,18]. http Isotactic polypropylene (iPP) offers a good balance of properties at reasonable cost [24].…”

Section: Introductionmentioning

confidence: 99%

“…Enhancing fracture resistance of iPP at low temperatures or high strain rates is usually achieved by rubber toughening strategy consisting of either physical mixing with elastomers or by reactor copolymerization with ethylene producing impact copolymers (ICPPs) [24][25][26]. It has already been shown that a desired balance of the low temperature fracture toughness and high temperature stiffness of PP can be achieved by incorporating small volume fraction of rigid core-soft shell inclusions with engineered elastomer shells [5,6,17]. It has been speculated that, in addition to the delocalized shear-yielding most effective during crack initiation, further enhancements of the low temperature fracture resistance of iPP may be achieved by introducing additional deformation mechanism active also in the later stage of the fracture process.…”

Section: Introductionmentioning

confidence: 99%

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Effect of in-situ formed core–shell inclusions on the mechanical properties and impact fracture of polypropylene

Jančář

Žídek

2015

European Polymer Journal

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Preparation of PBT/POE‐g‐GMA/PP ternary blends with good rigidity–toughness balance by core–shell particles

Shang

Cheng

Shentu

et al. 2019

J of Applied Polymer Sci

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Compared with poly(butylene terephthalate)/glycidyl methacrylate grafted poly(ethylene-octene) (PBT/POE-g-GMA) binary blends, supertough PBT-based ternary blends with little rigidity loss were successfully obtained by adding rigid polypropylene (PP) into PBT/POE-g-GMA blends to construct core-shell particles during melt blending. The effects of PP content and type on the phase morphology and mechanical properties of the blends were systematically investigated. Theoretical predictions and scanning electron microscopy observation showed that a core-shell structure was formed in PBT matrix with PP as the core and POE-g-GMA as the shell. The mechanical property tests showed that POE-g-GMA and PP had significant synergistic toughening effect. When PP with high melt flow index (H-PP) was used, PBT/POE-g-GMA/H-PP (70/15/15) blends possessed the highest Izod notched impact strength, which was 1.9-fold compared with PBT/POE-g-GMA (70/30) binary blends, while the tensile performance loss was little. The essential work of fracture tests was performed to evaluate the fracture resistance of different samples. The results demonstrated that PBT/POE-g-GMA/ PP ternary blends possessed much better resistance to crack propagation than PBT/POE-g-GMA binary blends. The decrease of interparticle distance and the fibrillation of core-shell particles activated intense matrix shear yielding, which was the reason for the high crack resistance of ternary blends.

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Toughening with little rigidity loss and mechanism for modified polypropylene by polymer particles with core–shell structure

Cited by 54 publications

References 72 publications

Fabrication of polypropylene blends with excellent low‐temperature toughness and balanced toughness‐rigidity by a combination of EPR and SEEPS

Fabrication of polypropylene blends with excellent low‐temperature toughness and balanced toughness‐rigidity by a combination of EPR and SEEPS

Effect of in-situ formed core–shell inclusions on the mechanical properties and impact fracture of polypropylene

Preparation of PBT/POE‐g‐GMA/PP ternary blends with good rigidity–toughness balance by core–shell particles

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