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Polymers and Polymer Composites

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Title: MECHANICAL PROPERTIES OF SISAL REINFORCED COMPOSITES IN RESPONSE TO WATER ABSORPTION
Page Range: p.407-426
Author(s): Rong M Z; Zhang M Q; Liu Y; Zhang Z W; Yang G C; Zeng H M
File size: 254K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 10
Issue No: No. 6

Abstract
The water absorption behaviour of sisal and the mechanical properties of sisal fibre-reinforced epoxy composites aged in water, are discussed. The effect is examined of a series of fibre pretreatment techniques on the water resistance of sisal and its composites. These include mercerisation, acetylation, cyanoethylation, coupling agent treatment and thermal treatment. An evaluation of these treatments is included, and results show that the water absorption behaviour of sisal composites is controlled mainly by the fibre and the fibre/matrix interfacial properties. Modification of sisal fibres is shown to be necessary to retard water diffusion and enhance interfacial adhesion in order for natural fibre composites to be used in practical applications. 18 refs.

Title: INFLUENCE OF MALEATION OF GROUND RUBBER TYRE (GRT) ON THE THERMORHEOLOGICAL BEHAVIOUR OF THERMOPLASTIC ELASTOMERS BASED ON ETHYLENE PROPYLENE DIENE RUBBER, GRT AND ETHYLENE-CO-ACRYLIC ACID
Page Range: p.427-432
Author(s): Naskar A K; De S K; Bhowmick A K
File size: 84K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 10
Issue No: No. 6

Abstract
A study is reported of the thermorheological behaviour of thermoplastic elastomer blends based on both ground rubber from scrap tyres, (GRT) and maleic anhydride grafted GRT, (m-GRT) to determine the influence of the maleation on the GRT in blends with EPDM and ethylene-co-acrylic acid with respect to the rheological characteristics of the blend. Higher storage and loss shear moduli and shear viscosity was noted for the m-GRT based TPE compared to the GRT based TPE composition. An interaction between m-GRT and A-HDPE was evident from the loss tangent spectra of the blends as well as from the die swell of the melt extrudates. The m-GRT based TPE produced smoother extrudates at low shear rates than the blend containing non-maleated GRT. However, at higher shear rates, both compositions showed melt fracture. 16 refs.

Title: ENHANCED PERFORMANCE OF LDPE/SBS BLEND MODIFIED ASPHALT THROUGH DYNAMIC VULCANIZATION
Page Range: p.433-440
Author(s): Gao G; Zhang Y; Zhang Y; Sun K
File size: 107K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 10
Issue No: No. 6

Abstract
A blend of LDPE and SBS was used to modify an asphalt, and a storage-stable modified asphalt was prepared by dynamic vulcanisation. The vulcanisation characteristics of the modified asphalt were studied using a strain-controlled rheometer. The vulcanisation of the SBS in the blend-modified asphalt resulted in a marked increase in the torque. The physical properties of the LDPE/SBS blend-modified asphalt containing even a small amount of sulphur were shown to be improved, together with its storage stability. The rheological properties of the blend-modified asphalt before and after the addition of sulphur were characterised using a dynamic shear rheometer and a rotational viscometer. 18 refs.

Title: GLASS FIBER REINFORCED COMPOSITES OF COLOURED EPOXY RESIN CURED WITH DIFFERENT AMINES
Page Range: p.441-446
Author(s): Patel M R; Patel M P; Patel R H; Patel R G
File size: 103K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 10
Issue No: No. 6

Abstract
A novel coloured epoxy resin has been synthesised by reaction between epichlorohydrin and bisazodiol. This paper discusses the curing kinetics and thermal stability of the coloured epoxy resin, blended with a conventional epoxy resin in the ratio of 15:85 (w/w) using various amine curing agents. Several glass fibre reinforced composites of coloured epoxy resins and DGEBA resin in the same weight ratio were prepared using diethylenetriamine, triethylenetetramine, p-p-'-diamino diphenyl sulphone and p-p'-diamino diphenyl methane as curing agents in stoichiometric proportions. The fabricated composites were evaluated for mechanical strength, electrical properties, and resistance to various chemicals, and these properties are shown to be related to the effect of the amine structure of the curing agent used. 15 refs.

Title: POLYOLEFIN COMPOSITES FILLED WITH MAGNESIUM HYDROXIDE
Page Range: p.447-456
Author(s): Zhu S; Zhang Y; Zhang Y
File size: 132K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 10
Issue No: No. 6

Abstract
Modified and non-modified composites of PP and LLDPE filled with magnesium hydroxide were investigated, and maleic acid anhydride-grafted PP or LLDPE were used as polymeric modifiers, (MAH-g-PP, or MAH-g-LLDPE) to enhance the interaction between the flame retardant filler and the polymer. When LLDPE was partially replaced by MAH-g-LLDPE, it was found that the notched Izod impact strength, tensile strength, and flexural strength of the composites increased, while the modulus decreased. When the PP was partially replaced by MAH-g-PP, the tensile strength and flexural strength of the composites increased, and the impact strength and modulus changed slightly. The phase structure of the composites was characterised using SEM, DMTA, and DSC which provided evidence to suggest an encapsulation of LLDPE or PP around magnesium hydroxide filler particles in the PP/LLDPE composites containing MAH-g-LLDPE or MAG-g-PP. 13 refs.

Title: CYCLOMATRIX PHOSPHAZENE POLYMERS VIA ALDER-ENE REACTIONS
Page Range: p.457-466
Author(s): Reghunadhan C P; Sunitha M; Ninan K N
File size: 123K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 10
Issue No: No. 6

Abstract
The Alder-ene cure chemistry was used to design novel thermosets with a view to the development of thermally stable formulations based on cyclotriphosphazenes. The protocol was to design an allyl phenoxy substituted cyclotriphosphazene and effect its cure using a bismaleimide. This paper reports the synthesis, curing and properties of cyclomatrix phosphazene polymers derived from the reaction between allylphenoxy phosphazene and bismaleimide system. 27 refs.

Title: EFFECT OF HEAT TREATMENT ON THERMOMECHANICAL PROPERTIES OF ELECTRON BEAM-CURED EPOXY RESINS
Page Range: p.467-480
Author(s): Zhang Z-G; Sui G; Zhone W-H; Sun Z-J
File size: 149K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 10
Issue No: No. 6

Abstract
A study is described of the effects of thermal post-treatment on electron beam-cured epoxy resins. Dynamic mechanical analyses were performed on samples which differed in EB radiation dose, initiator dose, molecular weight, and molecular weight distribution. The influence of these variables on heat treatment is examined, and studies of the effects of heat treatment on EB-cured bisphenol A epoxy resins provide an understanding of the how technology parameters affect the formation of the crosslinked structure. 16 refs.

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