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Polymers and Polymer Composites

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Title: THERMAL STABILITY AND DEGRADATION OF THERMALLY STABLE PREPOLYMERS UNDER CONTROLLED ATMOSPHERE. IV- THERMAL STABILITY AND DEGRADATION OF CROSS-LINKED SYSTEMS PREPARED FROM CYANATE MONOMERS
Page Range: p.103-120
Author(s): Richer S; Alamercery S; Raffin G; Sanglar C; Waton H; Grenier-Loustalot M F
File size: 205K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 10
Issue No: No. 2

Abstract
A study is reported on the thermal degradation of cyanate prepolymers and corresponding materials prepared in the molten state by the homopolymerisation of monomers in a controlled atmosphere, (nitrogen), and in the temperature range of 100 to 500 degrees C. Degradation mechanisms are proposed for these materials based on the analysis of physicochemical data obtained by DSC, TGA, gas chromatography-mass spectrometry, and Fourier transform infrared spectroscopy of volatile organic compounds and residues after the thermal cycle. The degradation mechanisms are shown to be dependent on the structure of the carbon skeleton. 8 refs.

Title: NEOALKOXY TITANATE AND ZIRCONATE COUPLING AGENT ADDITIVES IN THERMOPLASTICS
Page Range: p.121-172
Author(s): Monte S J
File size: 374K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 10
Issue No: No. 2

Abstract
A comprehensive review is presented of neoalkoxy titanate and neoalkoxy zirconate coupling agent additives in thermoplastics. Titanates are compared to silanes, and titanate retractability with substrates such as calcium carbonate, carbon black and organic substrates is demonstrated. The superiority of titanates over silanes on silane retractable substrates is shown with respect to filler coupling and polymer catalysis mechanisms. Improvements in properties and cycle times are illustrated by means of application examples. References from literature searches are further discussed. 54 refs.

Title: PROCESSING AND PROPERTIES OF POLYPROPYLENE COMPOSITES WITH HIGH FILLER CONTENT
Page Range: p.173-182
Author(s): Ren Z; Shanks R A; Rook T J
File size: 163K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 10
Issue No: No. 2

Abstract
Tests were carried out on highly filled PP composites with varying filler contents up to 70 wt.%. The fillers used were calcium carbonate, talc and barium sulphate. These underwent surface modification with titanate or silicone. Such surface modification of the fillers facilitated extrusion, and reduced brittleness, while providing hard composites with high density. Tensile properties were measured and related to the composition, filler type and surface treatment. 10 refs.

Title: MODIFICATION OF POLYPROPYLENE BY BLENDING WITH OLIGOPINENE
Page Range: p.183-188
Author(s): Mendes L C; Martins B B B
File size: 94K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 10
Issue No: No. 2

Abstract
The aim of this work is to find a new material by blending PP with oligopinene resins in order to modify the mechanical, adhesive, permeability and sealing properties of PP and to find ways of increasing the usage of pinene oligomers. Changes in the physical properties, melting behaviour and morphology of PP blended with low molar mass oligopinene resin were evaluated. When the amount of oligopinene increased n the blends, the elastic modulus, stress at break, hardness and density all increase, while the elongation at break shows an abrupt drop because of the hard-brittle nature of the oligomer. The blend changes its behaviour from ductile to brittle above 10%-wt. of the oligomer. SEM results indicate that the oligopinene phase is located mainly in the intraspherulitic regions of the PP. 13 refs.

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