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Polymers and Polymer Composites

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Title: THERMAL DEGRADATION OF ELASTOMER BASED NANOCOMPOSITES
Page Range: p.283-293
Author(s): Susmita Dey Sadhu; Rajeev R S; Bhowmick A K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 16
Issue No: No.5

Abstract
The thermal degradation behaviour of nanocomposites based on SBR, BR and nitrile rubber with various amounts of acrylonitrile and either sodium montmorillonite or octadecyl amine-modified sodium montmorillonite clays was investigated by thermogravimetry. The effects of the type of nanofiller, rubber polarity and filler loading on thermal degradation of the rubbers were examined and activation energies of degradation calculated using the Flynn-Wall-Ozawa method. 26 refs.

Title: MODELLING OF STRENGTH AND STIFFNESS BEHAVIOUR OF NATURAL FIBRE REINFORCED POLYPROPYLENE COMPOSITES
Page Range: p.295-302
Author(s): Taha I; El-Sabbagh A; Ziegmann G
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 16
Issue No: No.5

Abstract
The mechanical properties of an injection moulded sisal-PP composite were investigated by tensile and single fibre pull-out tests. An analytical model based on the rule of mixtures accounting for the different modes of load transfer between matrix and fibre and their changeover was derived and verified against the experimental findings and literature data. Close agreement between the model and experimental results was achieved at low fibre contents (below 20 wt.%) and fibre contents exceeding 40 weight percent. 22 refs.

Title: STORAGE STABILITY OF ULTRAVIOLET IRRADIATED HDPE
Page Range: p.303-307
Author(s): Shushan Deng; Qianping Ran; Shishan Wu; Jian Shen
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 16
Issue No: No.5

Abstract
Changes in the concentration of oxygen-containing groups, such as C-O and C=O, introduced by UV irradiation onto HDPE and the hydrophilicity of the irradiated HDPE before and after storage for up to 11,040 h. were investigated. The irradiated HDPE was used as a compatibiliser in HDPE/sericite-tridymite-cristobalite and the mechanical properties of the compatibilised blend investigated before and after storage. 11 refs.

Title: KINETIC MODEL FOR THE THERMAL DEGRADATION OF POLY(METHYLPHENYLSILOXANE)
Page Range: p.309-314
Author(s): Sun J T; Huang Y D
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 16
Issue No: No.5

Abstract
The kinetics of thermal degradation of polymethylphenylsiloxane were investigated under non-isothermal conditions by dynamic thermogravimetry and corresponding kinetic parameters of the degradation stages (unzipped and rearranged) determined using the Kissinger and Friedman methods. The Arrhenius pre-exponential factor and reaction order for the two degradation stages were also determined and a kinetic model developed using the values of the kinetic parameters. 14 refs.

Title: EFFECT OF FILLERS ON THE FIRE RETARDANT PROPERTIES OF INTUMESCENT POLYPROPYLENE COMPOUNDS
Page Range: p.315-322
Author(s): Faghihi J; Morshedian J; Ahmadi S
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 16
Issue No: No.5

Abstract
The effects of fillers, including ammonium polyphosphate, aluminium trihydrate and talc, and an impact modifier/compatibiliser (EVA) on the fire retardant and mechanical properties of PP were investigated by tensile and Izod impact testing, TGA, scanning electron microscopy and limiting oxygen index measurements. The influence of a silane coating on the surface of ammonium polyphosphate was also investigated. The results obtained were interpreted by means of thermal decomposition, chemical reaction between the components and formation of a protective ceramic-like layer at the surface of talc-filled PP upon ignition. 27 refs.

Title: PERMEATION OF CHLORINATED HYDROCARBON VAPOURS THROUGH POLY(ETHYLENE-CO-VINYL ACETATE) MEMBRANES
Page Range: p.323-329
Author(s): Kumar S A; Muralidharan M N; Kumaran M G; Thomas S
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 16
Issue No: No.5

Abstract
The permeation of chlorinated hydrocarbon vapours through uncrosslinked and crosslinked EVA membranes was investigated. Dicumyl peroxide and benzoyl peroxide were used as crosslinking agents. The effects of crystallinity, crosslinker loading, type of crosslinking agent and penetrant size on permeation were examined and the influence of free volume on gas barrier properties evaluated using positron annihilation lifetime spectroscopy. Crosslink density was calculated using the equilibrium sorption method and its influence on permeation also assessed. 22 refs.

Title: SYNTHESIS AND CHARACTERIZATION OF BIS(3-VINYL ESTER-2-HYDROXY PROPANE) ETHER-TERMINATED POLY(DIMETHYLSILOXANE) TOUGHENED EPOXY-CLAY HYBRID NANOCOMPOSITES
Page Range: p.331-341
Author(s): Chozhan C K; Alagar M; Gnanasundaram P
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 16
Issue No: No.5

Abstract
A bis(3-vinyl ester-2-hydroxy propane) ether-terminated poly(dimethylsiloxane) was synthesised from diglycidyl ether-terminated PDMS and acrylic acid, structurally characterised by FTIR spectroscopy and NMR spectroscopy and used as a toughening agent in a diglycidyl ether of Bisphenol A epoxy resin cured with 4,4'-diaminodiphenylmethane. The epoxy system and toughened epoxy system were further modified with organophilic montmorillonite clay and the mechanical, dynamic mechanical and thermal properties of the systems investigated. The water absorption behaviour of the systems was also investigated and fracture surfaces of the systems characterised by scanning electron microscopy. 44 refs.

Title: HIGHLY FIBER-LOADED COMPOSITES: PHYSICAL AND MECHANICAL PROPERTIES
Page Range: p.343-347
Author(s): Nourbakhsh A; Ashori A
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 16
Issue No: No.5

Abstract
The effects of coupling agent (maleated PP) and fibre content on the physical and mechanical properties of a PP composite containing poplar fibre as the reinforcing filler were investigated. The elastic modulus, modulus of rupture, internal bonding and dimensional stability of the composites were determined and the influence of temperature on water absorption and thickness swelling examined. The mechanical strengths of the composites improved slightly as fibre loading increased and physicomechanical properties were significantly improved with the addition of the coupling agent. 16 refs.

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