Polymer Journals

Polymers and Polymer Composites

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Title: PERMANENT, TRANSPARENT, NON-BLOOMING AND NON-HYGROSCOPIC ANTISTATIC AGENTS BASED ON COMBINED NEOALKOXY ORGANOMETALLICS
Page Range: p.1-32
Author(s): Monte S J
File size: 959K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 10
Issue No: No. 1

Abstract
A new class of antistatic agents are used to prepare antistatic polymer compositions via treatment with selected combinations of neoalkoxy titanates and zirconates and trineoalkoxy zirconates. They are added in minor amounts during compounding to form non-blooming, bipolar layers of dissimilar organometallics, creating a surface and volume electron-transfer circuit, which results in an antistatic effect that works independently of atmospheric moisture. These materials are soluble in, but not limited to polyolefins, polyesters, polystyrenes, polyurethanes, vinyls, elastomers, solvent and waterborne acrylics and coatings, and remain stable during processing. The relative merits and inherent chemistries of the different antistatic agents are discussed, and application data are included for the new organometallic materials. The discussion includes definitions, conventional antistatic chemistry, and methods of improving efficiency of conductive particulates through coupling and catalysis. 19 refs.

Title: HALOGENATED AND NON-HALOGENATED FLAME RETARDANT ADDITIVES IN POLYPROPYLENE (PP) HOMOPOLYMER FOR BATTERY APPLICATIONS
Page Range: p.33-36
Author(s): Rangaprasad R; Rangen K; Vasudeo Y B
File size: 374K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 10
Issue No: No. 1

Abstract
Experimental work is described to develop flame retardant PP using halogenated and halogen-free additives, to meet V0 requirements according to the UL94 standard for the manufacture of injection moulded battery cases, and to study the effects of the flame retardant on the mechanical properties of PP. The batteries investigated are used as back-up units in the telecommunications industries, and use sulphuric acid as the electrolyte. The effect of flame retardant additives on the heat sealing properties is also investigated.

Title: ANTIOXIDANTS AS SOURCES OF PLASTICS DISCOLORATION: STRUCTURAL EFFECTS
Page Range: p.37-48
Author(s): Pospisil J; Habicher W D; Zweifel H; Pilar J; Nespurek S; Piringer O G
File size: 534K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 10
Issue No: No. 1

Abstract
The sacrificial transformation of antioxidants is an inevitable consequence of their active role in the protection of plastics from oxidation. The process results in various new products, some of which are responsible for the discoloration of plastics. The chemical structures of the principal colourants arising from phenolic and aromatic amine antioxidants and phenolic UV absorbers are outlined. 23 refs.

Title: SILOXANES AS ADDITIVES FOR PLASTICS
Page Range: p.49-62
Author(s): Stadtmueller S
File size: 906K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 10
Issue No: No. 1

Abstract
The use is discussed of organomodified siloxanes as additives for plastics for use as modifiers and process aids. The products, due to their modification, combine the efficiency of silicone oils with good compatibility with polymeric resins, and depending on the nature of the organic moiety and the overall molecular weight, organomodified siloxanes can be adapted to special applications within polymers. Functions range from performance additives, lubricants or dispersing agents, as in filled compounds, to surface modifying additives to improve characteristics such as scratch resistance. An evaluation is made of various filled and unfilled PP compounds containing representatives of such organomodified siloxanes processed via extrusion, injection and blow moulding. It was demonstrated that process parameters such as energy consumption, pressure build up and output rate on a twin-screw extrusion line could be increased, and a positive influence on surface properties obtained. 12 refs.

Title: SPECIFIC CONDUCTIVE CARBON BLACKS IN PLASTICS APPLICATIONS
Page Range: p.63-72
Author(s): Van Bellingen C; Probst N; Grivei E
File size: 751K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 10
Issue No: No. 1

Abstract
Features are described of high structure/low surface area/low surface activity conductive carbon blacks used in plastics applications, with particular reference to grades of Enasco conductive carbon blacks from Erachem Europe. These products can be used at low loadings and with ease of compounding to impart properties to plastics. They are claimed to provide a new generation of compounds which offer a specific balance of compounding, mechanical, flow and conductive properties. 8 refs.

Title: ANALYSING THE CONTENT OF ANTIOXIDANTS IN PP MATERIALS
Page Range: p.73-82
Author(s): Schroeder H F; Zeynalov E B; Bahr H; Rybak T
File size: 518K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 10
Issue No: No. 1

Abstract
Evidence is presented that the model reaction of the initiated oxidation of cumene can be used for the simultaneous determination of phenolic and hindered amine functionalities of stabilisers, with particular reference to Chimassorb 119 and 944 grades. The condition of the stabiliser is useful for assessing the consumption of stabilisers by different processes during the production, storage, weathering and service life, and is therefor important in the compounding of durable products for recycling and in critical applications. The established dependence offers a way of determining the effective concentration of the active groups of HAS and SHPh stabilisers in polyolefin formulations by means of one model reaction. 30 refs.

Title: USE OF POST-LIFE WASTE AND PRODUCTION WASTE IN THERMOPLASTIC POLYMER COMPOSITIONS
Page Range: p.83-92
Author(s): Kowalska E; Wielgosz Z; Pelka J
File size: 746K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 10
Issue No: No. 1

Abstract
The management of waste rubbers and plastics and waste from the production of fertiliser phosphogypsum is discussed with reference to their re-use in blends with virgin and recycled polymers. The novel polymer compositions are used to make porous pipes, vehicle parts, flooring, road safety and traffic control equipment, sound absorbing motorway screens, packing in biological wastewater treatment, and biodegradable flower pots, buckets, fencing and similar profiles. Formulations and properties are tabulated.

Title: REVOLUTIONARY LIGHT STABILISER SYSTEM FOR POLYOLEFINS AND OTHER RESINS
Page Range: p.93-100
Author(s): Arnaboldi P; Davis L; Samuels S-B; Zenner J M; Vulic I
File size: 751K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 10
Issue No: No. 1

Abstract
Cytec has developed a new class of light stabilisers which are claimed to provide an extraordinary efficiency in polyolefin systems beyond what is afforded by current state-of-the-art hindered amine light stabiliser (HALS) technology. At equivalent or reduced stabiliser loading, the systems are demonstrated to extend the UV stability of thick section PE and PP. In addition, aesthetic properties such as colour and gloss are improved. The superior performance properties of the new high efficiency light stabilisers, UV-4611 and UV-6435 are shown in studies involving LLDPE, HDPE, and PP. 15 refs.

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