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In this article, the crystalline morphology of the cast film was controlled by the nucleating agent self-assembled into supramolecular structures at different temperature fields. Subsequently, the effect of crystalline morphology and orientation on porosity and uniformity of microporous membranes was investigated. The morphology of β nucleating agent (NA) networks changes from needle-like agglomerates...
We reported a novel and effective strategy to achieve higher continuity at a lower volume fraction of interphase by using compatibilizers in ternary blend consisting of PVDF, PS and HDPE. PVDF-g-PS was synthesized by electron beam radiation induced free radical graft copolymerization reaction and PVDF-g-PS was characterized by FTIR, DSC and 1H NMR. PVDF-g-PS showed effective compatibilization in PVDF/PS...
A thermodynamic and kinetic method based on the selective distribution and migration of multi-walled carbon nanotubes (MWCNTs) in polyoxyethylene (PEO)/ethylene-α-octene random copolymer (ORC) composite system was reported to improve the dispersion of MWCNTs in ORC. Scanning electron micrographs and transmission electron micrographs confirmed that MWCNTs could almost completely migrate from the PEO...
Simultaneous improvement of stiffness and toughness of isotactic polypropylene (iPP) has caught tremendous effort for decades and previously we have shown that the modification of iPP with combined nanofillers and β-nucleating agent (β-NA) is an efficacious way to balance its stiffness and toughness. However, simultaneous introduction of reinforcing fillers and β-NA generates nucleation competition...
In this work, phase morphology and mechanical properties of ternary blends of PA6 (Polyamide 6), EPDM-g-MA (Ethylene-propylene-diene rubber grafted with maleic anhydride) and different HDPEs (high-density polyethylene) have been studied. Although HDPEs of various viscosity and contents are used, the binary (EPDM-g-MA/HDPE) dispersed phase is of a core–shell structure, in which HDPE forms the core...
A strong shear flow was imposed on the melt of polycarbonate (PC) microfibril reinforced high density Polyethylene (HDPE) during a secondary melt flow process, i.e. gas assisted injection molding (GAIM). Classic shish-kebabs and typical transcrystallinity were simultaneously observed in the entire thickness of the GAIM HDPE/PC microfibril composites, which were closely related to the strong shear...
Compared to PA6/EPDM-g-MA binary blends, considerable improvement in the notched impact toughness was achieved in PA6/EPDM-g-MA/HDPE ternary blends in which core–shell structure formed during melt blending, and its toughening mechanism was investigated in this work. Two processing methods were applied to prepare the PA6/EPDM-g-MA/HDPE ternary blends, to obtain core–shell structure with different thickness...
β phase isotactic polypropylene (β-iPP) with the β phase lamellae oriented parallel to the melt extrusion direction, was employed to investigate the deformation-induced structure evolution at various temperatures (25, 80, 110, 130 and 140 °C). The orientation change of β phase during deformation greatly influences the β to α phase transformation and its temperature dependence. At temperatures lower...
A low temperature approach to prepare stereocomplex of high-molecular-weight poly(l-lactide) (PLLA) and poly(d-lactide) (PDLA) at temperatures much lower than those adopted in conventional melt blending, is presented in this paper. Wide-angle X-ray diffraction and differential scanning calorimetry results verified that complete stereocomplex crystallites without any evidence of the formation of homocrystallites...
In this work, the relationship between properties and morphologies of PA6/EPDM-g-MA/HDPE ternary blends was studied. Two processing methods (one- and two-step methods) were applied to prepare the PA6/EPDM-g-MA/HDPE ternary blends. The dependence of the phase morphology on interfacial interaction and processing method was discussed here. It was found that core-shell morphology (core: HDPE, shell: EPDM-g-MA...
The focus of this study was the effect of spatial confinement on the development of nucleating agent-induced β phase polypropylene (PP) in the dynamically vulcanized thermoplastic elastomers (TPVs) based on dynamically vulcanized PP/ethylene-propylene-diene rubber (EPDM) blend. The melting behaviors, crystalline structures and the morphologies of the blends were studied by differential scanning calorimetry...
The selective distribution of aluminum borate whisker in isotactic polypropylene (iPP)/syndiotactic polypropylene (sPP) blends was studied. For iPP/sPP/whisker composites, whiskers are distributed in iPP phase, which follow the theory of interfacial tension. When Irganox 1010 is introduced into the composites, the distribution of whiskers is changed from iPP phase to sPP phase. The results of contact...
In this study, we have investigated the effect of thermoplastic vulcanizates (TPV) content and characteristic on the double yielding of injection molded polyamide 6 (PA6)/TPV blends uniaxially tensile deformed at room temperature. The results indicated that the TPV content and characteristic showed a marked effect on the double yielding phenomenon. The morphological observation by scanning electron...
To understand the crystalline morphology of the parts molded by gas-assisted injection molding (GAIM), in this work, the hierarchical structures and the crystalline morphology of gas-assisted injection molded high-density polyethylene (HDPE) were investigated. According to the comparison between the results of the GAIM part and those of the conventional injection molded counterpart, it is found that...
The effects of the draw temperature and the strain rate on the tensile deformation of polyamide 6 (PA6) were investigated using three PA6 samples with different initial shapes and physical dimensions. It is observed that the special double yielding phenomenon is indeed present in PA6, provided that certain temperature and strain rate are given, as well as the appropriate initial structure. The results...
The enhanced crystallization of polycarbonate in the blend of liquid crystalline polymer/polycarbonate/(ethylene–methyl acrylate–glycidyl methacrylate) copolymer (LCP/PC/E–MA–GMA) was studied by wide angle X-ray diffraction (WAXD) and differential scanning calorimetry (DSC). The LCP/PC/E–MA–GMA 5/95/5 blends annealed at 200°C, for 2, 4, 6, and 10h, present an obvious crystalline structure corresponding...
Polycarbonate (PC)/polyethylene (PE) blend was injection molded at three temperatures: 190, 230 and 275°C. Due to different deformability of PC phase at the different molding temperatures, the blends exhibit different morphologies. The sample molded at 190°C only contained many uniformly dispersed spherical PC particles due to the incapability of flow and deformation of PC phase at this temperature...
In situ microfibrillar reinforced blend (MRB) based on poly(ethylene terephthalate) (PET) and isotactic polypropylene (iPP) was elaborated by a slit die extrusion, hot stretching, and quenching process. The scanning electronic microscopic images show well-developed PET microfibers in the blends. The on-line small angle X-ray scattering (SAXS) test shows that PET microfibers have high nucleation for...
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