Polymer Journals

Polymers and Polymer Composites

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Title: EFFECT OF POLYMERIZATION CONDITIONS ON THE DENSITY AND TG OF BISPHENOL-A AND HEXAFLUOROISOPROPYLIDENE-CONTAINING POLYBENZOXAZINES
Page Range: p.367-376
Author(s): Kanchanasopa M; Yanumet N; Hemvichian K; Ishida H
File size: 81K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 9
Issue No: No. 6

Abstract
The volumetric expansion of bisphenol-A and aniline-based benzoxazine is studied by comparing the room temperature density of the cured benzoxazine under different polymerisation conditions with the amorphous benzoxazine monomer. The Tg of aniline-based benzoxazine at various degrees of polymerisation is investigated by differential scanning calorimetry, and the degrees of conversion at different polymerisation temperatures were compared with the respective Tg temperatures. A fluorinated polybenzoxazine was synthesised from the ring opening polymerisation of hexafluoroisopropylidene-containing benzoxazine monomer. Properties of the fluorine-containing polymer were compared to those of non-fluorinated polybenzoxazine. The effect of fluorine incorporation on Tg temperature and thermal stability are examined. 29 refs.

Title: CARBON FIBRE-REINFORCED POLY(PHENYLENESULPHIDE) COMPOSITE COATINGS
Page Range: p.377-384
Author(s): Sugama T; Gawlik K
File size: 76K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 9
Issue No: No. 6

Abstract
The development is described of a high temperature, high performance corrosion resistant polymeric coating for carbon steel heat exchanger tubes used in geothermal binary-cycle power plants. In order to enhance the thermal conductivity and improve the mechanical properties of polyphenylene sulphide (PPS) used as the coating material, chopped carbon fibres were incorporated into the PPS matrix. Experiments were carried out on steel panels and it was established that 0.5 wt% of fibres was the most effective amount of fibres to minimise the rate of penetration of electrolytes through the composite coating films. Results of testing indicate hydrothermal stability in addition to corrosion resistance. The rough surface texture of the fibres provided mechanical interlocking bonds with the PPS matrix and such interfacial bonding is said to be responsible for the good mechanical properties of the composite film. 11 refs.

Title: EVOLUTION OF DAMAGE ZONE IN ADHESIVE LAYER OF ADHESIVELY BONDED BUTT JOINTS UNDER CYCLIC LOADING
Page Range: p.385-392
Author(s): Imanaka M; Turui T; Akizuki Y
File size: 165K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 9
Issue No: No. 6

Abstract
The adhesive layer of a butt joint bonded by rubber-modified adhesive was observed under cyclic loading conditions using a microscopic video camera in transmitted light. Applying Gurson's constitutive equation to the adhesive layer, the elastic-plastic finite element analysis was performed to simulate the damage behaviour in the adhesive layer. It was established that the observed damage zone coincided with the high void fraction zone. These findings establish the modified Gurson model as a useful tool for the estimation of initiation and propagation of the damage zone in the adhesive layer. 15 refs.

Title: ANISOTROPY RELATED 'SPRING-IN' OF ANGLED COMPOSITE SHELLS
Page Range: p.393-402
Author(s): Ding Y; Chiu W K; Liu X L
File size: 75K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 9
Issue No: No. 6

Abstract
A 3-D finite element analysis procedure was developed to predict spring-in resulting from anisotropy for both thin and thick angled composite shell structures.. It is believed that such distortion of curved or angled shell structures occurs mainly from the significant difference between the in-plane CTE and the through-thickness CTE during post cure cooling. The results of the FE analysis were evaluated together with those from the analytical study and experimental investigations. FE analysis was demonstrated to provide more accurate results than the analytical model, particularly for thicker composite shells. The corner radius effect, shell thickness effect and lay-up sequence effects on spring-in are discusses, together with the effect of tool/part interaction on the total distortion behaviour. 16 refs.

Title: EVALUATION OF TWO-ROLL MILL METHOD FOR PREPARING SHOT GLASS FIBRE REINFORCED NBR-PHENOLIC COMPOSITES
Page Range: p.403-408
Author(s): Rezadoust A M; Esfandeh M
File size: 91K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 9
Issue No: No. 6

Abstract
Preparation of short fibre composites is examined with reference to the use of a two-roll mill, and the effect of fibre length on mechanical properties. In this study, 50 mm glass fibres were used to prepare acrylonitrile-butadiene rubber-phenolic glass fibre composites. Fibre breakage during processing was studied, and the fibre critical length was calculated. On the basis of the critical length, the usefulness of the two-roll mill method for preparing glass-NBR-phenolic composites was assessed. 10 refs.

Title: INTERFEROMETRIC DETERMINATION OF ORIENTED AND SOME OPTICAL PARAMETERS OF ANNEALED POLYESTER FIBRES
Page Range: p.409-422
Author(s): Fouda I M; El-Sharkawy F M
File size: 144K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 9
Issue No: No. 6

Abstract
Annealed polyester fibres were investigated by the use of multiple-beam Fizeau fringes in transmission to determine the effects of heat treatment by the determination of refractive indices of their skin and core layers.. Optical orientation parameters were obtained by the application of equations used by Hermans and Ward. Some structural parameters such as electric polarisability, and the density of the samples was measured by a system based on the theory of vibrating strings. The density and optical results were used to calculate the degree of crystallinity, the mean square density fluctuation, the form birefringence, the number on monomeric units per unit volume, the harmonic mean polarisability of the dielectric, and the harmonic mean specified refractive index. 33 refs.

Title: VIBRATION REDUCTION ABILITY OF POLYMERS, PARTICULARLY POLYMETHYLMETHACRYLATE AND POLYTETRAFLUOROETHYLENE
Page Range: p.423-426
Author(s): Fu W; Chung D D L
File size: 25K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 9
Issue No: No. 6

Abstract
A description is given of a comparative study of the vibration reduction ability of a number of polymers: PMMA, PTFE, nylon-66, polyacetal and epoxy resin. The objective of the research is to identify polymers which can be used as vibration damping materials. Of the materials tested, PMMA exhibited the highest loss modulus, while PTFE exhibited the highest loss tangent. A synthetic rubber had an exceptionally low loss modulus, but an exceptionally high loss tangent. Epoxy and acetal exhibited the lowest loss tangent. 14 refs.

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