Polymer Journals

Polymers and Polymer Composites

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Title: MANUFACTURING AND RECYCLING OF SISAL-POLYPROPYLENE COMPOSITES
Page Range: p.467-479
Author(s): Rao S; Bhattacharyya D; Jayaraman K; Fernyhough A
File size: 277K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 17
Issue No: No.8

Abstract
Sisal-PP composite sheets were manufactured using a 3-factor two-level experimental design based on the Taguchi method to maximise the mechanical properties of the composites. The composite sheets were mechanically recycled by pelletising the sheets and feeding through an extruder and the effects of recycling on the crystallinity, fibre length, mechanical properties (tensile modulus, tensile strength, and impact strength) and stress relaxation of the recycled sheets investigated and compared with those of the unrecycled composite sheets. 21 refs.

Title: EFFECTS OF SURFACE TREATMENT OF GROUND RICE HUSK ON THE POLYURETHANE BASED ON CASTOR OIL
Page Range: p.481-485
Author(s): Sherif S A; Sadek M A; Ashour F H; Bassyouni M
File size: 180K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 17
Issue No: No.8

Abstract
A PU elastomer based on castor oil and polymeric MDI with a NCO/OH ratio of 2 was synthesised and mixed with untreated and treated rice husk having an average particle size of less than 200 micrometers. The treated rice husk was obtained by pretreatment with steam and sodium hydroxide solution and the effects of the pretreated rice on the properties of the composites investigated. The dispersion and fracture surfaces of the composites were examined by scanning electron microscopy and composite properties determined by hardness measurements, TGA and differential scanning calorimetry. Composites containing steam-treated rice husks possessed enhanced interfacial adhesion and were considered good candidates for parquet flooring, shoe heels and sports surfaces. 7 refs.

Title: MECHANICAL PROPERTIES OF INJECTION-MOULDED JUTE/GLASS FIBRE HYBRID COMPOSITES
Page Range: p.487-493
Author(s): Ohta T; Takai Y; Yew Wei Leong; Hamada H
File size: 454K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 17
Issue No: No.8

Abstract
Long glass and jute fibres were simultaneously incorporated into a PP matrix and the tensile and impact properties of the hybrid composites obtained investigated. Fracture surfaces were characterised by scanning electron microscopy and the properties of the hybrid composites compared with those of composites reinforced with glass fibres only. It was found that composites containing up to 20 wt.% jute fibres exhibited similar tensile properties to those of glass fibre-reinforced composites. The distribution of glass and jute fibres was anisotropic, wherein glass fibres tended to accumulate at the skin region of mouldings, thus orientating towards the resin flow direction. Jute fibres tended to remain at the core regions and were mostly oriented transverse to the flow direction. 11 refs.

Title: DIFFUSION OF THE CURING AGENT THROUGH TWO EPDM RUBBER SHEETS WITH DIFFERENT % PEROXIDE DURING THEIR SIMULTANEOUS CURE
Page Range: p.495-504
Author(s): El Brouzi A; Granger R; Vergnaud J M
File size: 423K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 17
Issue No: No.8

Abstract
An investigation was carried out into the diffusion of a peroxide (Perkadox 14-40) through two EPDM sheets (one containing 2% and the other 10% peroxide), pressed together and cured in a heated mould kept at 187 degrees Centigrade. The results obtained are discussed in terms of a gradient of hardness through the thickness of the sheets, the swelling behaviour of the sheets in toluene and the resistance to liquid and swelling of the bi-layer rubber system. Modelling of the process of absorption and evaporation was also performed, explaining torsion of the bi-layer sheet observed during absorption and its stability. This transfer of curing agent during curing is applicable to the retreading of truck tyres with a new rubber band. 19 refs.

Title: CHARACTERIZATION OF POLYAMIDE 6/SUPERFINE SILK POWDER BLEND FILMS
Page Range: p.505-511
Author(s): Xin Liu; Weilin Xu; Wenbin Li
File size: 296K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 17
Issue No: No.8

Abstract
Superfine silk powder was blended with polyamide-6 and the blends extruded and hot pressed into films. The dyeing and mechanical properties of the blend films were investigated and the interfacial adhesion and microstructure of the blend films studied by various methods, including scanning electron microscopy. The blends were found to be compatible and their dyeability dependent on silk powder content. Mechanical properties of the blend films decreased compared with those of polyamide-6 film and addition of silk powder favoured the formation of gamma-monoclinic crystals of polyamide-6 in the films, as observed by ATR FTIR spectroscopy and wide angle X-ray diffraction. 25 refs.

Title: EFFECT OF INTERTUBE ADHESION ON MECHANICAL PROPERTIES OF TUBULAR CELL POLYPROPYLENE HONEYCOMBS
Page Range: p.513-519
Author(s): Rahimi H; Khalili V; Ghoreishy M H R; Rezadoust A M; Esfandeh M
File size: 369K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 17
Issue No: No.8

Abstract
An investigation was carried out into the effect of the level of adhesion between PP tubes on the mechanical properties of honeycomb sandwich panels fabricated from PP, epoxy adhesive and plywood. The adhesion level of the honeycomb core was varied by altering the duration of corona surface treatment of the PP tubes and the influence of surface treatment on adhesion studied by contact angle measurements. Core delamination, compression and flexural tests were also performed on the sandwich structures, which revealed that the mechanical properties of the sandwich panels improved with increasing adhesion strength between the PP tubes. 13 refs.

Title: PREPARATION, CHARACTERISATION AND MECHANICAL PROPERTIES OF ENVIRONMENTALLY FRIENDLY WATERBORNE POLYURETHANE AND POLYURETHANE-ACRYLATE
Page Range: p.521-527
Author(s): Fengxian Qiu; Jingli Zhang; Dongmei Wu; Qinqin Zhang; Dongya Yang
File size: 283K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 17
Issue No: No.8

Abstract
Environmentally friendly, water-borne PU was prepared from a polyester polyol, isophorone diisocyanate and dimethylol propionic acid and polyurethane-acrylate dispersions were obtained from different proportions of butyl acrylate and methyl acrylate by an in-situ dispersion technique. The structures, optical transparency, physical properties, mechanical properties and heat stabilities of the PU and polyurethane-acrylate dispersions and films prepared therefrom were investigated and compared. The polyurethane-acrylates were found to possess better transparency, higher tensile strength and lower elongation at break and were considered potential candidates for coatings, leather finishing, adhesives, sealants, plastics coating and wood finishes. 10 refs.

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