Polymer Journals

Polymers and Polymer Composites

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Title: SYNTHESIS OF ORGANICALLY-MODIFIED SILICA PARTICLES FOR USE AS NANOFILLERS IN POLYMER SYSTEMS
Page Range: p.101-110
Author(s): Arkhireeva A; Hay J N
File size: 151K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 12
Issue No: No. 2

Abstract
This work describes two approaches for the preparation of hybrid particles for use as nanofillers in polymer systems. A modified Stoeber method is used to prepare a range of organically-modified silica nanoparticles with diameters in the range of 50-200 nm. The synthesis of organically-modified silica particles was also carried out using a non-hydrolytic sol-gel route, which has not previously been widely used for the preparation of hybrid nanoparticles. It is shown that the hydrolytic and non-hydrolytic routes produced hybrids with different structures and morphologies, and that the organically-modified silica particles synthesised using these sol-gel methods, have potential applications as nanofillers in polymer systems. 26 refs.

Title: ENVIRONMENTAL AND MICRO-ENVIRONMENTAL INFLUENCES AFFECTING THE PERFORMANCE OF POLYMER STABILISERS
Page Range: p.111-117
Author(s): Pospisil J; Pilar J; Marek A; Billingham N C; Horak Z; Nespurek S
File size: 134K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 12
Issue No: No. 2

Abstract
The use of accelerated testing for the analysis of the efficiency and durability of light stabiliser packages for plastics is discussed, with the aim of reducing the development cycle time for the design of polymeric articles for outdoor applications. Acceleration of photooxidation, heterogeneity in polymer degradation, formation of concentration gradients in stabiliser consumption, and the possibility of determining the spatial distribution of stabiliser transformation products or the negative influences accounting for atmospheric pollutants, are analysed to minimise misleading data from accelerated tests, and to provide a basis for providing more information on the chemical and physical processes accompanying the testing of stabilised polymers. 25 refs.

Title: NOVEL FUNCTIONALISED ETHYLENE ACRYLATE COPOLYMERS AS POLYMER MODIFIERS
Page Range: p.119-125
Author(s): Hausmann K; Chou R T; Coreen Y Lee
File size: 235K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 12
Issue No: No. 2

Abstract
A novel reactive functionalised polymer modifier system based on ethylene acrylate copolymers produced by a tubular reactor polymerisation process is discussed. The tubular copolymers are reported to be unique due to the heterogeneous distribution of acrylate comonomer in the polymer chain making them more compatible with a variety of polymer systems. As such, they find application as modifiers and universal masterbatch carrier resins for a variety of polymer systems in a more appropriate way than their autoclave based homologues, it is claimed. They provide compatibility with both polar and non-polar polymers. The incorporation of a reactive functional group such as maleic anhydride is used to provide optimal morphology for polymer modification, and such use is examined with reference to nylon-6. Further property enhancements are reported, together with the additional application as a coupling agent for mineral fillers and polymer matrices. 4 refs.

Title: STUDIES ON THE MECHANISM OF THERMAL DECOMPOSITION OF UNSATURATED POLYESTER RESINS WITH REDUCED FLAMMABILITY
Page Range: p.127-134
Author(s): Kicko-Walczak E
File size: 137K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 12
Issue No: No. 2

Abstract
An investigation is reported of the thermal decomposition of halogenated unsaturated polyester resins, flame retarded by zinc hydroxystannate and crosslinked with styrene. Thermogravimetry in both dynamic and isothermal mode, and coupled on-line with FTIR spectroscopy or mass spectroscopy were used as analysis methods. Results showed that elimination of phthalic anhydride takes place at ca. 330 degrees C and then at ca. 380 degrees C, styrene and a complex mixture of other aromatic compounds were evolved. Further studies using TG-FTIR revealed that the evolution of carbon dioxide is considerably reduced by zinc hydrostannate, whereby, at a later stage of decomposition of H2O and HBr (traces), can be identified. On the basis of the results obtained, a mechanism of decomposition was formulated that takes into account the reactions of tin compounds with the products coming from ester linkage rupture processes. 19 refs.

Title: RESPONDING TO THE CONSUMERS' DESIRE FOR IMPROVED HYGIENE WITH ANTIBACTERIAL PLASTICS
Page Range: p.135-142
Author(s): Payne J
File size: 121K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 12
Issue No: No. 2

Abstract
Market research into the potential market for antibacterial plastics is examined which shows a strong positive response to the incorporation of antibacterial performance in domestic articles, and in particular, in public places. Details are given of the results of the surveys carried out by telephone questionnaires. Avecia has launched a range of antibacterial additives aimed at polyolefins and PVC, and experimental data are included for antibacterial PVC, which are the result of using a quantitative method, the JIS Test Method Z2801, with two relevant organisms. Interpretation of the data to support performance claims is detailed. 5 refs.

Title: NEW FORMULATIONS FOR SYNDIOTACTIC POLYSTYRENE
Page Range: p.143-150
Author(s): Kowalska E; Skupinski W; Wielgosz Z; Nicinski K; Pasynkiewicz S
File size: 282K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 12
Issue No: No. 2

Abstract
The formation of syndiotactic polystyrene in the presence of catalysts of the formula CpTiCl2(OC6H4Cl)/MAO was investigated and optimised parameters were determined. Results of rheological and endurance tests, molecular weight and syndiotacity and melt temperature are reported. After synthesis, the polymeric powder was granulated with stabilisers and modifiers. Syndiotactic polystyrene was modified by glass fibre or talc, plasticisers and/or polyoxyphenylene. Physical and mechanical properties of the resultant composites were investigated. 23 refs.

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