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Polymers and Polymer Composites

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Title: LOW-VELOCITY IMPACT BEHAVIOUR OF 3-D GLASS FIBRE HOLLOW INTEGRATED CORE SANDWICH COMPOSITES
Page Range: p.175-179
Author(s): Cao H; Qian K; Wei Q; Li H
File size: 212K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 18
Issue No: No.4

Abstract
In the current work, 3-D glass fibre woven fabric-reinforced composites were fabricated by impregnating epoxy resin in a hand lay-up procedure for the hollow integrated core sandwich structure. Four types of 3-D structures were investigated in terms of the impact properties as a function of the z-direction fibre length (5, 6 and 7 mm) and covered skins (covered with aluminium) in core structures. Impact properties including peak load, time to peak load, and absorbed energy were evaluated. It was found that the 3-D hollow integrated core sandwich composites covered with aluminium skin considerably enhanced the impact resistance. Photographs of the impact damage taken after impact tests were analyzed and discussed in terms of a hollowing on the front face sheet against the load applied, and whitening spread in the impact point on the back face sheet of the composites was also studied. 10 Refs.

Title: STUDY ON A HIGH PERFORMANCE PACKAGING MATERIAL OF HDPE/LLDPE/ OMMT NANOCOMPOSITES
Page Range: p.181-188
Author(s): Zhou L; Li P; Song G; Gu Z; Wang L; Gao Z
File size: 179K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 18
Issue No: No.4

Abstract
New types of HDPE/LLDPE/OMMT nanocomposites, which were used as packaging materials, were prepared by direct injection moulding without any compatibiliser. This method was similar to the film forming technology. TEM observation revealed that the OMMT layers were homogeneously dispersed throughout the matrix at the nano-scale. The results of mechanical properties measurement showed that the tensile strength, tensile modulus, flexural strength and flexural modulus were improved remarkably with small amounts of OMMT, whose contents were below 6.0 wt.%. For example, the yield strength of the nanocomposite with 4.0 wt.% OMMT was 32.8 MPa, which increased 27.6% compared with that of the neat sample. Meanwhile, the heat deflection temperature values and TGA results showed that the thermal stability also improved. 17 Refs.

Title: EPDM/HDPE-BASED THERMOPLASTIC VULCANISATES STUDIED BY PHYSICAL-MECHANICAL TESTS AND IR SPECTROMETRY
Page Range: p.189-195
Author(s): Moldovan Z; Ionescu F; Alexandrescu L; Carsote C
File size: 264K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 18
Issue No: No.4

Abstract
For the present study, blends of ethylene-propylene-diene terpolymer (EPDM) rubber with a thermoplastic polyolefin namely high-density polyethylene (HDPE) were prepared by dynamic vulcanisation. The physicomechanical tests, IR spectra (recorded by attenuated total reflection technique) and ageing behaviour of the binary blends were investigated, analyzing the effect of the rubber/thermoplastics ratio, the kind of reticulating agent and the percent of plasticiser on the properties of the prepared polymer blends. 23 Refs.

Title: EFFECT OF SALICYLIC ACID ON THE MECHANICAL PROPERTIES AND WATER RESISTANCE OF SOY PROTEIN ISOLATE FILMS
Page Range: p.197-203
Author(s): Bai H; Kumar R; Yang C; Liu X; Zhang L
File size: 238K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 18
Issue No: No.4

Abstract
Soy protein composites films (SF) have been prepared using soy protein isolate (SPI), salicylic acid (SA) and glycerol as a plasticiser. To prepare water resistant soy protein composites films (SF-B), 2, 2-diphenyl-2- hydroxyethanoic acid (DPHEAc) was used. Different amounts of SA were added in both SF and SF-B films. The results showed that the SF-B films with 0.5% (wt) of SA had higher tensile strength and modulus with low water uptake than that of SF films at same amount of SA. Contact angle analysis also indicated that the SF-B films showed hydrophobic surface. Thus both lower levels of water uptake and hydrophobic surface indicated high water resistance of the materials. Higher transmittance value and increased intermolecular hydrogen bonding showed higher compatibility between SPI and SA. This work provided a new approach in the use of SA in water resistant soy protein films for enhancing the processing window. 30 Refs.

Title: HYBRIDIZATION EFFECT OF GLASS FIBRE ON MECHANICAL, MORPHOLOGICAL AND THERMAL PROPERTIES OF POLYPROPYLENE-BAMBOO/GLASS FIBRE HYBRID COMPOSITES
Page Range: p.205-218
Author(s): Nayak S K; Mohanty S; Samal S K
File size: 503K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 18
Issue No: No.4

Abstract
Polypropylene/bamboo fibre-reinforced composites (BFRP) and polypropylene-bamboo/glass fibre based hybrid composites (BGRP) using an intermeshing counter-rotating twin-screw extruder followed by injection moulding in which maleic anhydride grafted polypropylene (MAPP) was used as a compatibiliser. The effect of hybridisation on the mechanical performance of hybrid composites has been assessed. It was observed that replacement of 15 wt.% of bamboo fibre by 15 wt.% of glass fibre with 2 wt.% of MAPP on a total amount of 30 wt.% of fibre content showed optimum mechanical performance. The water uptake of the hybrid composites was also found to be less than that of their unhybridised counterpart. The crystallisation, melting behaviour and thermal stability of the hybrid composites were investigated employing differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). TGA thermograms showed an increase in thermal stability of the matrix polymer after incorporation of bamboo and glass fibres, confirming the effect of hybridisation and efficient fibre matrix interfacial adhesion. The fibre-matrix interfacial morphology of the tensile fractured specimens was studied using scanning electron microscopy (SEM) which showed less fibre pullout and fewer gaps between the fibre and the base matrix in case of MAPP-treated hybrid composites. 46 Refs.

Title: REACTIVE COMPATIBILIZATION AND ELASTOMER TOUGHENING OF POLY(2,6-DIMETHYL-1,4-PHENYLENE OXIDE)/POLYAMIDE 6 BLENDS
Page Range: p.219-226
Author(s): Li B; Wan C; Zhang Y; Ji J; Su Y
File size: 358K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 18
Issue No: No.4

Abstract
Poly(2,6-dimethyl-1,4-phenylene oxide)/polyamide 6 (PPO/PA6) blends were reactively compatibilised by maleic anhydride (MA) grafted PPO (PPO-g-MA) and toughened by MA grafted styrene-ethylene-butadiene-styrene block copolymer (SEBS) (SEBS-g-MA) via melt extrusion. The compatibilising effect of PPO-g-MA on the PPO/PA6 blends was studied by using scanning electronic microscopy, differential scanning calorimetry and mechanical properties tests. The notched impact strength of PPO-g-MA/PPO/PA6/SEBS-g-MA blends increased with increasing SEBS-g-MA content, leading to blends having super-tough behaviour. The fracture behaviour of the PPO/PA6 blends was studied using a modified essential work of fracture model (EWF), which showed that plastic deformation related to SEBS-g-MA was the crucial factor for the toughening. 31 Refs.

Title: THE FABRICATION AND PROGRESS OF HOLLOW STRUCTURES
Page Range: p.227-235
Author(s): Cao S; Chen J; Hu J; Yuan X
File size: 183K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 18
Issue No: No.4

Abstract
The fabrication of hollow particles is one of the fastest-growing fields of materials research, owing to their potential applications in catalysis, chromatography, separation, coatings, protection of bioactive agents, microelectronics and electrooptics. As reported in recent studies, a variety of chemical and physicochemical methods have been employed to prepare hollow spheres with hierarchical and well-defined morphologies. For this, a basic understanding of the mechanism and recent advances in the fabrication of hollow spheres is discussed, along with outstanding challenges, issues, and potentially future opportunities. Evidently, it will enable the development in the fabrication of hollow particles with unique and tailored properties. 93 Refs.

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