Polymer Journals

Polymers and Polymer Composites

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Title: STRESS INTENSITY FACTOR FOR AN ELLIPTIC INCLUSION IN ORTHOTROPIC LAMINATES SUBJECTED TO FREEZE-THAW: MODEL VERIFICATION
Page Range: p.571-588
Author(s): Roy S; Nie G H; Karedla R; Dharani L
File size: 208K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 10
Issue No: No. 8

Abstract
An analytical formulation is presented which has been developed and validated for use in calculating the stress intensity factor due to water-ice inclusion in both transversely ISOTROPIC and ORTHOTROPIC matrices. By use of finite element analysis, it was established that the stress field in the vicinity of an elliptical inclusion was an acceptable analytical idealisation by which to obtain the stress intensity for a crack with ice inclusion. Results are discussed which indicate that the stress state in a slender elliptic elastic inclusion can be used to approximate the stress field at the crack face, which could subsequently be adopted to determine the stress intensity factor. Analyses of the delamination and fatigue life prediction for freeze-thaw cycling are provided as specific applications of the model. 13 refs.

Title: EFFECT OF FIBER SURFACE TREATMENT ON MECHANICAL PROPERTIES OF POLYETHYLENE/EPOXY COMPOSITES
Page Range: p.589-598
Author(s): Higuchi Y; Tadayoshi S; Mizoguchi M; Fukui T; Hamada H
File size: 427K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 10
Issue No: No. 8

Abstract
The performance of a rehabilitated pipe is examined with respect to the effects of fabric surface treatments on the performance of the structural composites used to rehabilitate the pipeline, and in particular, the effects on performance, created as a result of the permeability of the resin to the fibre bundles. Results are reported of tensile and pipe performance tests carried out on PE/epoxy materials in which the PE fibres were pre-treated to remove the binder and/or sized. It was shown that the tensile modulus of the composites was increased by pre-treatment and that the tensile strength remained almost the same. The strength retention of pre-treated composites was higher than that of composites with both a binder and a size. Differences in pipe performance were caused by the different interphase resulting from pre-treatment and/or sizing. 7 refs.

Title: EVALUATION OF GLASS FIBRE/EPOXY PREPREG QUALITY DURING STORAGE
Page Range: p.599-606
Author(s): Ji J K; Wei C Y; Deng W H; Zhang Y S; Liu Y L; Mao R Z; Wang X
File size: 87K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 10
Issue No: No. 8

Abstract
Characterisation methods are reported which are used in the evaluation of chemical changes to glass fibre/epoxy prepregs during storage in an environment chamber. Such methods included infrared spectroscopy, thermal analysis and other chemical methods to measure the volatile and insoluble components content. Precuring is found to take place during storage as a result of a chemical reaction between some epoxide groups. Tests were carried out on laminates made from prepregs that had been degraded to different degrees, and flexural and tensile properties were found to be significantly reduced as a consequence of the increase in the precured degree of the prepregs. 11 refs.

Title: EFFECT OF HEAT TREATMENT ON THE IMPACT STRENGTH OF GLASS FIBRE REINFORCED POLYPROPYLENE
Page Range: p.607-618
Author(s): Lin J-S
File size: 169K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 10
Issue No: No. 8

Abstract
An alternative method of improving the impact strength of glass fibre reinforced polypropylene by the use of heat treatment is described. Heat treatment is applied to injection moulded specimens in order to adjust the interfacial adhesion and hence the effectiveness of the transfer of stress from matrix to fibre. The interfacial adhesion is determined by measurement of the critical fibre length, which can be used to evaluate the effect of heat treatment on the impact strength of glass fibre-reinforced PP specimens. Results showed that impact strength increased with the testing temperature. At 25 degrees C, the impact strength was dominated by the fibre fracture mechanism, and at temperatures above 120 degrees C, it was found to be strongly influenced by the PP matrix, and at higher temperatures, the impact strength increased significantly because of the formation of extra cracks. 16 refs.

Title: RHEOLOGICAL AND MECHANICAL PROPERTIES OF PC/HDPE/GLASS FIBER COMPOSITES
Page Range: p.619-626
Author(s): Chaoqin L; Zhang Y; Zhang Y; Zhang C
File size: 278K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 10
Issue No: No. 8

Abstract
Whilst polycarbonate is a widely used engineering polymer, its tendency to notch sensitivity and crazing, together with its high melt viscosity and processing problems, have led to attempts to use it in blends with polyolefins. This, however, leads to a reduction in tensile and flexural strengths and stiffness. This paper, therefore, investigates the rheological and mechanical properties of polycarbonate in blends with HDPE and glass fibres. Maleic anhydride grafted LDPE was used as a compatibiliser, and tests were carried out on composites with and without the compatibiliser. LDPE-g-MAH in the composite was shown to improve the reinforcement efficiency of the glass fibres and strengthen the adhesion between polymer matrix and glass fibres, leading to good mechanical properties. 16 refs.

Title: CRITICAL REVIEW OF POLYMER-BASED COMPOSITE AUTOMOTIVE BUMPER SYSTEMS
Page Range: p.627-636
Author(s): Sapuan S M; Suddin N; Maleque M A
File size: 137K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 10
Issue No: No. 8

Abstract
A review is presented of automotive bumper systems with reference to design, materials selection and function. A description is given of bumper components and a critical review of polymer-based bumper systems with specific methodology, are provided. Advantages and disadvantages of polymer based composite materials, compared to those of traditional steel materials, are discussed, together with factors which need to be considered in the selection of a bumper system. 33 refs.

Title: CHARACTERISATION OF POLYETHYLENE FILM BLENDS POUCHES BY DIFFERENTIAL SCANNING CALORIMETRY
Page Range: p.637-640
Author(s): Suman M
File size: 62K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 10
Issue No: No. 8

Abstract
Differential scanning calorimetry is used for the characterisation of LDPE/LLDPE blends used in the production of packaging pouches. The use of DSC is described to explain the inadequate machinability of film pouches, and to demonstrate how improvements can be obtained by an increase in the LLDPE component. 10 refs.

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