Effect of melt flow on morphology and linear thermal expansion of injection-molded ethylene-propylene-diene terpolymer/isotactic polypropylene blends

Zhang, Kun; Jiang, Lili; Luo, Peng; Jiang, Jiandi; Wu, Guozhang

doi:10.1002/pi.4904

Cited by 9 publications

(9 citation statements)

References 39 publications

(67 reference statements)

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“…Figure (a) shows a typical plot of the normalized linear expansion dL / L as a function of temperature for EPDM, PP‐H, press‐molded, and injection‐molded EPDM‐70‐0.19 blends in different directions. The press‐molded sample exhibited isotropic thermal expansion . Nevertheless, the injection‐molded sample showed an anisotropic thermal expansion, and the thermal expansions in FD and TD were similar to that of neat PP.…”

Section: Resultsmentioning

confidence: 91%

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Thermoplastic rubber/PP elastomers toward extremely low thermal expansion

Zhang

et al. 2016

J of Applied Polymer Sci

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Fine regulation of the microstructure of rubber/polypropylene (PP) alloys could remarkably reduce the coefficient of linear thermal expansion (CLTE) while retaining the mechanical properties similar to those of thermoplastic elastomers. Rubber/PP elastomers with different morphologies were successfully prepared by controlling the appropriate rubber type, viscosity ratio, and processing method. The CLTE of the polymer alloy parallel to the microlayer directions was considerably reduced when the rubber domains were deformed into microlayers and co‐continuous with plastic domains. The thickness of the PP layers played a crucial role on CLTE reduction. The CLTE considerably decreased with reduced thickness of the PP layer. The sample with a co‐continuous microlayer structure exhibited good flexibility, high elongation, low hardness, and permanent deformation. Thus, low‐thermal‐expansion elastomer materials may have wide applications. Stress relaxation and strain recovery of the ethylene–propylene–diene terpolymer/PP (70/30 wt %) blend were investigated to further clarify the influence of co‐continuous microlayer structure on mechanical properties. Anisotropic mechanical properties were consistent with the morphology. Results of the stress relaxation behavior test would provide further support to the mechanism of the low thermal expansion of blends with co‐continuous microlayer structure. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43902.

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Section: Resultsmentioning

confidence: 91%

“…The dark areas in the transmission electron micrographs represent the rubber domains. An incomplete co‐continuous structure was found in the press‐molded EPDM‐70‐0.19 blend [Figure (a)] . Both plastic and rubber phases were elongated and oriented along the FD in the injection‐molded EPDM/PP and EPR/PP blends [Figures (b–d)].…”

Section: Resultsmentioning

confidence: 99%

Thermoplastic rubber/PP elastomers toward extremely low thermal expansion

Zhang

et al. 2016

J of Applied Polymer Sci

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“…In fact, the warpage is a distortion which might make the surfaces of the molded part deviate the designing. However, achieving low and uniform shrinkage is a complicated task, due to the presence and interaction of many factors such as molecular and fiber orientations, mold cooling, part and mold designs, and process conditions [8]. The mold shrinkage values, as shown in Fig.5, range from 0.18% to 6.59% for this plastic product, where the peak value of shrinkage of 6.59% are presented around the pouring gate.…”

Section: Resultsmentioning

confidence: 99%

Design and Process Optimization of Polymer Filling for Electronic Key Shell Based on Numerical Analysis

Niu¹

2017

dtetr

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Abstract. The electronic key is widely used in our life due to its small volume, tempting color, beautiful shape and easily portability. In order to shorten the design cycle and reduce the test cost of mold for the shells of electronic key, the work should be done firstly to analyze the injection technique. The electronic key shell is analyzed by using Finite Element Method (FEM) to judge reliability of the structure. Static structural and explicit dynamics analysis are conducted. The results provide valuable reference for the structural optimization design. Injection moulding process of the shell is simulated by applying Moldflow. Results show that the shrinkage is too small, the average value 0.12 mm and maximum value 0.497mm, to neglect the negative effect on forming parts after the injection. Furthermore, the designed mold structure was reasonable, which meet the demand of injection practically.

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“…As illustrated in Fig. of Zhang et al , when the plastic and rubber phases overlap in a lamellar structure, the CLTE parallel to the lamella direction should be reduced to a value close to that of the plastic. The Young's modulus of the plastic was 50 to 1000 times higher than that of the rubber, and the expansion of the rubber parallel to the lamella direction should be completely restricted by the plastic layers.…”

Section: Introductionmentioning

confidence: 97%

“…We recently proposed a substantial approach to the design of polymer blends with low CLTE values . The large reduction in CLTE is not based on the addition of a low‐thermal‐expansion filler to suppress bulk expansion, but on the fine control of the micromorphology of the polymer blend.…”

Section: Introductionmentioning

confidence: 99%

Rubber‐toughened polyamide‐6 with a low thermal expansion coefficient: effect of preferential distribution of rubber and inorganic filler

Zhang

Takagi

et al. 2015

Polymer International

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The effects of morphological changes on the thermal expansion, toughness and heat resistance of polyamide‐6 (PA)/styrene–ethylene–butylene–styrene (SEBS)/polyphenylene ether (PPE) blends were investigated. Compared with the typical ‘sea (PA matrix)–island (PPE domain)–lake (SEBS in PPE domain)’ morphology, an injection‐molded ternary blend with a preferential distribution of SEBS component at the interface between PA and PPE exhibited a low coefficient of linear thermal expansion (CLTE) in the flow direction. This low CLTE was ascribed to the deformation of SEBS and PA into a co‐continuous microlayer network structure during injection molding. Consequently, the expansion preferentially occurred towards the thickness direction. Further CLTE reduction either by a change in PA viscosity or by the selective location of an inorganic filler was examined, and its influences on impact strength and heat resistance are discussed based on transmission electron microscopy observations. © 2015 Society of Chemical Industry

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Effect of melt flow on morphology and linear thermal expansion of injection-molded ethylene-propylene-diene terpolymer/isotactic polypropylene blends

Cited by 9 publications

References 39 publications

Thermoplastic rubber/PP elastomers toward extremely low thermal expansion

Thermoplastic rubber/PP elastomers toward extremely low thermal expansion

Design and Process Optimization of Polymer Filling for Electronic Key Shell Based on Numerical Analysis

Rubber‐toughened polyamide‐6 with a low thermal expansion coefficient: effect of preferential distribution of rubber and inorganic filler

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