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Polymers and Polymer Composites

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Title: THE EFFECT OF CERTAIN MORPHOLOGICAL FEATURES ON THE PERMEABILITY OF CLUSTERED FIBROUS MEDIA
Page Range: p.1-12
Author(s): Papathanasiou T D; Chen X
File size: 684K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 17
Issue No: No.1

Abstract
Numerical results are presented for boundary element simulations of creeping flow through model fibrous media composed of parallel fibre bundles. Starting from ordered arrays of fibre bundles, several types of microstructural variations, namely variations in the horizontal and vertical spacing of the bundles and changes in the sharpness of the bundle perimeter, are introduced and their effect on permeability is examined and quantified. The latter is achieved using a new parameter, called "measure of deviation", which is derived from Ripley's second order intensity function. It is shown that deviations from regular arrays cause substantial scatter in the corresponding permeability values. 26 refs.

Title: STUDY ON MORPHOLOGY AND STRUCTURE OF DYNAMICALLY CURED PP/MAH-G-POE/EPOXY BLENDS
Page Range: p.13-19
Author(s): Xueliang Jiang; Aijun Zhou; Jun Yuan
File size: 235K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 17
Issue No: No.1

Abstract
Dynamically cured PP/maleic anhydride-grafted ethylene-octene copolymer/epoxy blends were prepared by dynamic curing of the epoxy resin in the PP/maleic anhydride-grafted ethylene-octene copolymer. The morphology, mechanical properties, rheological properties and heat stability of the blends were investigated by scanning electron microscopy, tensile, impact and flexural testing, capillary rheometry and thermogravimetry. The effects of maleic anhydride-grafted ethylene-octene copolymer and epoxy resin contents on the mechanical properties of the blends were examined and the roles of the cured epoxy resin as filler and maleic anhydride-grafted ethylene-octene copolymer as compatibiliser considered. 21 refs.

Title: QUASI-STATIC PERFORATION STUDY USING A SHARP-TIP CONICAL INDENTER ON GRP PLATES CONTAINING SAND FILLER
Page Range: p.21-30
Author(s): Sabet A R; Beheshty M H; Rahimi H
File size: 430K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 17
Issue No: No.1

Abstract
The penetration and perforation performance of E-glass fibre-reinforced unsaturated polyester plates containing 20% of sand as a filler was investigated by means of quasi-static indentation testing using a sharp-tip (30 degree) indentor. The filler had particle sizes of 75 and 600 micrometers and the composite plates were subjected to perforation tests at 5 and 500 mm/min loading rates. Low-velocity impact performance of the composite plates was assessed from load-displacement behaviour during penetration and perforation. It was found that the coarse-sized filler acted as secondary reinforcement in terms of higher energy absorption and the major damage modes were fibre and matrix fracture followed by delamination. 31 refs.

Title: CONCENTRATION DEPENDENCE OF CRYSTALLINE POLY(L-LACTIDE) PREPARED BY FREEZE-DRYING SOLUTIONS
Page Range: p.31-35
Author(s): Hao Hong; Liu Rongjie; Zhao Yaling
File size: 155K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 17
Issue No: No.1

Abstract
Poly(L-lactide) was freeze dried from p-xylene solutions of varying concentrations and the molecular conformation and thermal properties of the freeze-dried poly(L-lactide) investigated by DSC and X-ray diffraction. It was found that the molecular conformation of the polymer in solution changed with solvent and temperature and that samples produced from dilute solution exhibited higher non-isothermal crystallisation temperatures and faster crystallisation rates. A critical concentration corresponding to De Gennes critical overlap concentration was detected and polymer chains were isolated from each other in solutions below the critical concentration, resulting in accelerated melt crystallisation of recovered samples. 14 refs.

Title: A STUDY OF THE ELECTROSPINNING OF AN H"2O-ACETONE-PCL TERNARY SYSTEM
Page Range: p.37-40
Author(s): Li Xiaoqiang; Su Yan; He Chuanglong; Wang Hongsheng; Mo Xiumei
File size: 177K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 17
Issue No: No.1

Abstract
A ternary system consisting of water, acetone and poly-epsilon-caprolactone was electrospun and the morphology of the nanofibres produced characterised by optical microscopy. Cloud point data were obtained by titration and a phase diagram for the ternary system constructed from the cloud point data. Bead-like nano/microfibres were obtained for potential use as cell growth scaffolds with possible controllable drug release capability. 7 refs.

Title: PREPARATION AND PROPERTIES OF A FRAGRANT ACRYLONITRILE-BUTADIENE-STYRENE/POLYCARBONATE ALLOY
Page Range: p.41-45
Author(s): Xiaolin Liu; Yajiang Huang; Qi Yang; Zhiqiang Jiang; Decai Feng
File size: 206K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 17
Issue No: No.1

Abstract
Two different fragrant essences (jasmine and sandalwood) were incorporated into an ABS/polycarbonate blend and the effect of the essences and essence content on the fragrant properties, mechanical properties and microstructure of the blends investigated. Volatility and mechanical tests, melt flow index measurement and scanning electron microscopy revealed that the essences not only endowed the blend with fragrance but also acted as lubricants and surface treatment agents during processing. It was established that the dosage of fragrant masterbatch needed to be kept under 5 phr to obtain the best combination of properties and that fragrance could be maintained for a long time at room temperature. 10 refs.

Title: ELECTROSPINNING AND CHARACTERISATION OF POLY(VINYL ALCOHOL) BLEND SUBMICRON FIBRES IN AQUEOUS SOLUTIONS
Page Range: p.47-54
Author(s): Hyun Woo Lee; Mohammad Rezaul Karim; Jae Hyeung Park; Do Gyu Bae; Weontae Oh; In Woo Cheong; Jeong Hyun Yeum
File size: 635K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 17
Issue No: No.1

Abstract
Ultrafine PVAl blend submicron fibres were produced by electrospinning PVAls with number-average degrees of polymerisation of 1700 and 4000 from an aqueous solution containing from 5 to 10% of polymer. The morphology and physical properties, such as tensile strength and melting temperature, of the fibres were investigated by scanning electron microscopy, DSC, X-ray diffraction and thermogravimetry. The effects of PVAl blend mass ratio and concentration and processing parameters, such as applied voltage, and capillary-to-collector distance, on fibre production were evaluated and potential applications, including medical applications, packaging, cosmetics and pharmaceutical applications considered. 23 refs.

Title: DYNAMIC MECHANICAL BEHAVIOUR OF BANANA-PSEUDOSTEM-FILLED UNPLASTICISED POLYVINYL CHLORIDE COMPOSITES
Page Range: p.55-61
Author(s): Zainudin E S; Sapuan S M; Abdan K; Mohamad M T M
File size: 220K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 17
Issue No: No.1

Abstract
The dynamic mechanical properties of unplasticised PVC and composites thereof with banana pseudostem fibres were investigated as a function of filler loading and temperature (from 30 to 140 degrees C). Composites containing banana pseudostem fibres and acrylic FM50 (PMMA) were also studied. The results are discussed in terms of storage modulus, tan delta, Tg, damping behaviour, segmental mobility and interfacial interaction. 12 refs.

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