Back SearchTitle: EFFECT OF PROPYLENE CARBONATE ON PHYSICAL PROPERTIES OF WOOD FIBREBOARD COMPOSITE
Page Range: p.265-271
Author(s): Ghosh A; Sain M
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Issue Year: ppc
Volume: 15
Issue No: No.4
Abstract
The effect of propylene carbonate as an accelerator on the mechanical properties and dimensional stability of composites made from wood fibre bonded with 5% wood resin and 5% urea formaldehyde was investigated. The results demonstrated that the mechanical
Title: PREDICTION OF THERMAL CONDUCTIVITY OF ALIGNED SHORT FIBRE COMPOSITES WITH DIFFERENT FIBRE ASPECT RATIOS
Page Range: p.273-280
Author(s): Jae-Kon Lee
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Issue Year: ppc
Volume: 15
Issue No: No.4
Abstract
A closed-form solution for the prediction of the thermal conductivity of an aligned short fibre composite with a distribution o of aspect ratios is proposed in stead of using the average aspect ratio. This present model is the extended version of Hatta an
Title: ELASTO-PLASTIC ANALYSIS OF THE IMPACT PERFORMANCE OF WOVEN FABRIC COMPOSITES
Page Range: p.281-290
Author(s): Hansun Ryou; Ji Hoon Kim; Ki Ho Joo; Kwansoo Chung; Jae Ryoun Youn; Tae Jin Kang
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Issue Year: ppc
Volume: 15
Issue No: No.4
Abstract
Elasto-plastic constitutive equations were developed to describe the mechanical behaviour of anisotropic and asymmetric materials such as fibrous composites. With respect to the yield criteria, the isotropic yield criterion was modified to represent the anisotropic and asymmetric properties of the composites, while the anisotropic evolution law of back-stress was applied to account for anisotropic hardening behaviour. Impact tests were conducted on laminated plain woven fabric composites. Finite element analysis results correlated well with experimental data, especially for the elasto-plastic constitutive equation, with proper description of the anisotropy and asymmetry. 23 refs.
Title: COMPOSITE MATERIALS FROM UNSATURATED POLYESTER/RICE HUSK ASH/NATURAL RUBBER-g-POLYSTYRENE
Page Range: p.291-295
Author(s): Chuayjuljit S; Sriratampai P; Potiyaraj P
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Issue Year: ppc
Volume: 15
Issue No: No.4
Abstract
In this work, black rice hull ash (BRHA) and natural rubber-grafted-polystyrene (NR-g-PS) were both used as fillers for preparing unsaturated polyester (UPE) composite materials. It was expected that both would produce an increase in the physical and thermal properties of the resin. The study revealed the effects of incorporating the fillers in various proportions. The impact strength was improved, with the composite of 100 UPE/30BRHA/5 NR-g-PS exhibited the highest flexural and impact strength, and the lowest water absorption. SEM micrographs indicated that the dispersion of NT-g-PS was more uniform than in the case of the ungrafted natural rubber in the UPE matrix. 11 refs.
Title: DYNAMIC VISCOELASTICITY OF CARBON FIBRE REINFORCED POLYMERS UNDER HIGH LOAD: EFFECTS OF STATIC AND DYNAMIC LOADS
Page Range: p.297-305
Author(s): Zhang Zuoguang; He Chenghong; Li Yubin; Sun Zhijie
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Issue Year: ppc
Volume: 15
Issue No: No.4
Abstract
This work attempts to investigate the dynamic viscoelasticity of unidirectional carbon fibre reinforced epoxy resins. Consideration is given to the effects of static and dynamic loading, the ratio of the two and the possible mechanisms. The EPLEXOR 500 dynamic mechanical thermal analyser was used which has a total load up to 500 N. The effects of loading on dynamic viscoelasticity is examined with respect to in two main aspects: the change of storage modulus and loss tangent, and the shift of glass transition temperature or frequency spectrum. 21 refs.
Title: PREPARATION OF NANOMETRE CARBON FIBRES BY USING A BLEND APPROACH
Page Range: p.307-311
Author(s): Wang-xi Zhang; Yan-zhi Wang
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Issue Year: ppc
Volume: 15
Issue No: No.4
Abstract
In this research, a new way to prepare nanometre carbon fibres is investigated, which is hoped to solve the problem of low yield and the production of carbonaceous materials as a byproduct of the existing production methods. The soapless emulsion polymerisation of methyl acrylate and acrylonitrile was carried out to obtain core-shell polymers. The composite fibres were spun from a mixture of the core-shell particles with PE resin, which were thermally stabilised in air at 180 deg.C for 1 hour and carbonised in nitrogen at 1000 deg.C to obtain nanometre carbon fibres. Nanometre carbon fibres of 400-500 micron diameter were prepared. The effect of the initiator concentration on the reaction rate was also examined. 7 refs.
Title: MECHANICAL AND THERMAL PROPERTIES OF NANO-COMPOSITES OF POLY(VINYL CHLORIDE) AND CO-POLY(VINYL CHLORIDE-VINYL ALCOHOL-VINYL ACETATE) WITH MONTMORILLONITE
Page Range: p.313-319
Author(s): Bibi N; Sarwar M I; Ishaq M; Ahmad Z
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Issue Year: ppc
Volume: 15
Issue No: No.4
Abstract
The synthesis and properties of nanocomposites derived from organophilic montmorillonite dispersed in PVC and poly(vinyl chloride-co-vinyl alcohol-co-vinyl acetate) matrices were studied using a solution intercalation method. Montmorillonite was intercala
Title: THERMAL DECOMPOSITION AND OXIDATION AGEING BEHAVIOUR OF POLYPROPYLENE/HALLOYSITE NANOTUBE NANOCOMPOSITES
Page Range: p.321-328
Author(s): Mingliang Du; Baochun Guo; Mingxian Liu; Demin Jia
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Issue Year: ppc
Volume: 15
Issue No: No.4
Abstract
The thermal decomposition and resistance to oxidation of polypropylene/halloysite (PP/HNT) nanotube nanocomposites is examined in detail. The effects of filler content and surface treatment of the HNT on the kinetics of their thermal decomposition and oxi
Title: THE INFLUENCE OF REACTION KINETICS ON POLYURETHANE/VINYL ESTER RESIN INTERPENETRATING POLYMER NETWORKS
Page Range: p.329-335
Author(s): Qin C L; Niu H J; Bai X D; Ding Y C; Yang W; Cai W M
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Issue Year: ppc
Volume: 15
Issue No: No.4
Abstract
A series of polyurethane/vinylester resin (butyl methacrylate) interpenetrating polymer networks (PU/VER(BMA) IPNs) with different PU catalysts and VER initiator levels was synthesised at room temperature by a simultaneous interpenetrating polymer network process. The kinetics of IPN formation was studied, and the influence of the kinetics on the microstructure and damping properties was established. It was shown that by using different polymerisation techniques, IPNs could be achieved with different microstructures, resulting in different damping properties. 14 refs.
Title: KINETICS OF AGEING OF WOOD-FILLED POLYPROPYLENE-BASED COMPOSITES
Page Range: p.337-341
Author(s): Nenkova S; Dobrilova C; Vassileva S; Natov M; Valcheva E
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Issue Year: ppc
Volume: 15
Issue No: No.4
Abstract
A study is reported of the kinetics of UV ageing of wood filled composites based on polypropylene filled with unmodified wood flour, and wood flour modified with maleic anhydride in amounts of 10%, 20% and 30%. The investigation showed that the ultraviolet degradation was an autocatalytic chain process. The decrease of the rate constants with increasing wood content showed that the wood flour had a screening effect on light. It was established that the modification of wood flour with maleic anhydride had a stabilising effect on the ageing of the composite due to a decrease in the number of active centres capable of undergoing oxidation, and in the number of carbonyl groups. Consequently, the modification of wood filler with maleic anhydride has been shown to have a stabilising effect on the ageing of the composite material. 9 refs.