Polymer Journals

Polymers and Polymer Composites

Logged into APC, CP, IPSAT, PPC, PRR, RRR & PRPRT.

Back  Search



Title: A NOVEL COUPLING AGENT TECHNOLOGY
Page Range: p.71-79
Author(s): Scofield J D; Bloyce P E; Thetford D; Rothon R; Liauw M
File size: 119K
Download the pdf (subscribers only)
Buy the pdf (non-subscribers)
Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 11
Issue No: No. 2

Abstract
Results from the development of a novel coupling agent technology soon to be commercialised, are described. Potential coupling agents were studied including carboxylic acid or cyclic anhydride groups as the coupling agent-to-filler bonding group. On the grounds of cost effectiveness and safety and ease of handling, a particular low molecular weight oligomeric carboxylic acid, containing high reactivity double bond per molecule, was selected for further study. This materials is referred to as Solplus C800. Particular reference is given to the performance of the technology in ATH filed EVA systems, and to its benefits over existing coupling agent technologies. 5 refs.

Title: EFFECT OF TESTING CONDITIONS ON PERFORMANCE AND DURABILITY OF STABILISERS IN PLASTICS
Page Range: p.81-90
Author(s): Pospisil J; Horak Z; Pilar J; Nespurek S; Billingham N C; Habicher W D
File size: 87K
Download the pdf (subscribers only)
Buy the pdf (non-subscribers)
Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 11
Issue No: No. 2

Abstract
The understandable trend to increase the durability of stabilised materials requires the application of reproducible and reliable accelerated testing methods, which allow for the adjustment of additive formulations whilst matching the commercial requirements, and allowing lifetime predictions, it is argued. However, the harshness of the testing method affects the individual processes involved regarding their activation energies and mechanisms, the physical relations in the polymer-stabiliser system, and the chemical and physical processes accounting for the consumption of stabilisers. The principal factors affecting any comparison of accelerated results with natural testing are outlined. 30 refs.

Title: ADDITIVES WITH DUAL FUNCTION - ACRYLATE ESTER COPOLYMERS AS MODIFIERS FOR ENGINEERING POLYMERS AND AS CARRIER RESIN FOR MASTERBATCHES
Page Range: p.91-100
Author(s): Hausmann K; Chou R
File size: 156K
Download the pdf (subscribers only)
Buy the pdf (non-subscribers)
Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 11
Issue No: No. 2

Abstract
The use is described of a family of ethylene copolymers for use as polymeric modifiers in engineering plastics and with the dual function of carrier resins for masterbatches. The copolymers are characterised through a very heterogeneous molecular architecture and thus, an enhanced compatibility with other polymers and fillers, making them suitable for use as either compatibilisers or impact modifiers, and also, due to their high filler acceptance, as carrier resins. The copolymers, known as Elvaloy AC, can be produced with both a high comonomer content and a low melt flow index. They are copolymers of ethylene and acrylate esters, which are produced by a high pressure free radical polymerisation process using a tubular reactor. 4 refs.

Title: THE WHY, WHAT AND WHEREFORE OF ANTIMICROBIAL SYSTEMS
Page Range: p.101-113
Author(s): Simmons J
File size: 381K
Download the pdf (subscribers only)
Buy the pdf (non-subscribers)
Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 11
Issue No: No. 2

Abstract
The use of antimicrobial systems in plastics products is discussed, with particular reference to the products from Wells Plastics. It is emphasised that it is important to choose the correct system to suit the product and its intended application, and that the efficacy of the antimicrobial system must be verified through appropriate antimicrobial testing. Antimicrobial test methods such as the halo and viable count methods are described. 12 refs.

Title: IMPROVEMENT OF THE PROPERTIES OF POLYETHYLENE WITH CHLORINATED POLYETHYLENE (CPE)
Page Range: p.115-122
Author(s): Marossy K; Barczy P
File size: 138K
Download the pdf (subscribers only)
Buy the pdf (non-subscribers)
Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 11
Issue No: No. 2

Abstract
Blends of HDPE and chlorinated polyethylene (CPE) are tested across the whole concentration range to determine improvements in properties of thus modified polyethylene. Conventional mechanical tests and dynamic mechanical tests were carried out. The blends were found to be multiphase systems of excellent technological compatibility. Between 10-15% by weight CPE was found to increase the modulus of PE. The results of analysis by X-ray scattering showed that the blends contained structural units not present either in the polyethylene or in the CPE. In addition, the blends are melt processable. 7 refs.

Title: DEGRADATION OF POLY(VINYL CHLORIDE) WITH DIFFERENT ADDITIVES STUDIES BY MICRO RAMAN SPECTROSCOPY
Page Range: p.123-132
Author(s): Gupper A; Wilhelm P Schiller M
File size: 138K
Download the pdf (subscribers only)
Buy the pdf (non-subscribers)
Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 11
Issue No: No. 2

Abstract
Raman spectroscopy was used to study the thermal degradation of PVC. Intensity enhancements of vibrations belonging to conjugated double bond sequences in the corresponding spectra allowed for the detection at the very first stage. In this initial period, the kinetics of degradation showed a linear increase in conjugated sequences. The influence of additives (calcium stearate, zinc stearate and zinc chloride) on the resistance of PVC to thermal stress was investigated by the same method, and results are compared with those for unstabilised PVC. A positive development in thermal behaviour was observed upon stabilisation, and predicted reaction mechanisms for single components were confirmed. 9 refs.

Title: EXCELLENT FLOW- AND CONVEYANCE- BEHAVIOUR, LOW DUST EMISSION AND OUTSTANDING PROPERTIES OF HALOGEN FREE FLAME RETARDANT COMPOUNDS REALIZED BY A NEW GENERATION OF ALUMINIUM-TRI-HYDRATE
Page Range: p.133-140
Author(s): Sauerwein R
File size: 1204K
Download the pdf (subscribers only)
Buy the pdf (non-subscribers)
Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 11
Issue No: No. 2

Abstract
This paper presents a new generation of non-post treated fine precipitated aluminium trihydrate (ATH), which is claimed to offer excellent powder processing and also outstanding compound properties in its use as a flame retardant additive. Details are given of the performance of Apyral 40CD in wire and cable applications, and in the compounding industry, where large productivity benefits can be realised, it is demonstrated.

Title: BLOWN FILMS FROM LINEAR LOW DENSITY POLYETHYLENE INCORPORATING BIODEGRADABLE ADDITIVE
Page Range: p.141-144
Author(s): Kale N; Jani K; Awate S; Rangaprasad R; Vasudeo Y
File size: 55K
Download the pdf (subscribers only)
Buy the pdf (non-subscribers)
Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 11
Issue No: No. 2

Abstract
Results are discussed of the use of a biodegradable additive in blown LLDPE films. The degradation additive/promoter, based on a complex mixture of natural polymers and catalysts, was converted into a 50% masterbatch in LLDPE at different levels, and the properties of the blown films derived therefrom were investigated. The films were subjected to real time degradation tests using natural soil and under vermicompost conditions.

Title: A NOVEL ADDITIVE CONCEPT FOR THE STABILISATION OF ABS
Page Range: p.145-152
Author(s): Wegmann A
File size: 217K
Download the pdf (subscribers only)
Buy the pdf (non-subscribers)
Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 11
Issue No: No. 2

Abstract
Details are given of a new liquid sterically hindered phenolic antioxidant, which besides imparting excellent thermal stability to the grafted rubber phase of emulsion ABS, can be dosed with a low margin of error, and easily emulsified. Such an emulsion, is claimed to have very good storage stability, and mixes well with the aqueous ABS latex. To reduce the initial colour of ABS after processing, new synergistic process stabilisers, based on lactone chemistry, have been developed. These new stabilisation concepts for ABS graft phase and ABS graft compounds, are shown to significantly improve the technical performance of ABS compounds. 1 ref.

Title: STABILIZATION OF SYNDIOTACTIC POLYSTYRENE OBTAINED IN PRESENCE OF CpTiCl2(OC6H4Cl)/MAO CATALYST
Page Range: p.153-158
Author(s): Kowalska E; Skupinski W; Wozniewski T; Wielgosz Z; Borensztejn M
File size: 114K
Download the pdf (subscribers only)
Buy the pdf (non-subscribers)
Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 11
Issue No: No. 2

Abstract
The stabilisation of syndiotactic polystyrene, obtained in the presence of the original cyclopentadienyl (p-chlorophenoxy) dichlorotitanium (IV)/methylaluminoxane catalytic system, was investigated. Use of this catalytic system, syndiotactic polystyrene melted in the temperature region of 250-260 degrees C, giving a wider temperature window for processing. Five types of commercial antioxidant and stabilisers were used, together with two specially synthesised stabilisers. These were used in amounts from 0.05 to 1.0 wt.%, and the stability of unstabilised and stabilised syndiotactic polystyrene in a moulding process was evaluated by measuring the melt flow rate in a plastometer, and after four extrusion passes. A second method for the evaluation of the stability of sPS was the measurement of the Index of Thermal Stability. Results of the trials are given. 14 refs.

%>