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Xu T.,Chinese Academy of Forestry | Xu T.,Shenzhen Guanheng New Materials Technology Co. | Liu H.,Chinese Academy of Forestry | Song J.,University of Michigan-Flint | And 4 more authors.
Chinese Chemical Letters | Year: 2015

With the natural rosin derivative (maleopimaric acid, MPA) as the raw material, imide modified vinyl poly(dimethylsiloxane) (MP-VMS) was synthesized and characterized by 1H NMR and 13C NMR. The curing kinetic parameters of MP-VMS were determined by differential scanning calorimetry (DSC) at various heating rates (5, 8, 10, 15 °C/min) from the Kissingner, Ozawa and Crane methods. The activation energy (Ea), pre-exponential factor (A) and reaction order (n) were respectively 18.6 kJ/mol, 71,108 and 0.902. The low-temperature and high-temperature resistance of its curing product were respectively investigated by DSC and thermogravimetric analysis. The results showed that incorporation of MPA could significantly improve the thermal stability of silicone while had no effect on the low-temperature resistance, and the Tmax (the temperature corresponding to the maximum weight loss rate) increased by 70.7 °C. © 2015 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved. Source


Xu T.,Chinese Academy of Forestry | Xu T.,Shenzhen Guanheng New Materials Technology Co. | Liu H.,Chinese Academy of Forestry | Song J.,University of Michigan-Flint | And 4 more authors.
Journal of Polymer Science, Part A: Polymer Chemistry | Year: 2015

A novel imide modified vinyl-containing fluorosilicone resin (MP-VFS) was firstly prepared from maleopimaric acid (MPA), and characterized by 1H NMR and 13C NMR. Containing MPA based imide heterocycle (MPABI), MP-VFS was further used as a novel cross-linker to prepare MPA modified fluorosilicone rubber (MP-FSR). Morphology, mechanical and oil-resistance properties, thermal properties, and low temperature resistance of MP-FSR had been studied. Microphase separation was observed in MP-FSR. Although the tensile strength of fluorosilicone rubber was not significantly enhanced, the tearing strength, breaking elongation, rebound resilience and hardness were effectively improved. When the MP-VFS content was 2.0 wt %, the tearing strength of MP-FSR was increased by 23.5%, breaking elongation by 18.6% and rebound resilience by 9.7%. The thermal stability was enhanced due to the incorporation of MPABI. © 2015 Wiley Periodicals, Inc. Source


Xu T.,CAF Institute of Chemical Industry of Forest Products | Xu T.,Shenzhen Guanheng New Materials Technology Co. | Liu H.,CAF Institute of Chemical Industry of Forest Products | Song J.,University of Michigan-Flint | And 4 more authors.
Journal of Applied Polymer Science | Year: 2015

Imide-containing vinyl fluorosilicone resin (MR-VFS) was synthesized from maleated rosin (MR). And then, with MR-VFS as a new polar cross-linking agent in a heat curable fluorosilicone rubber composition, a series of maleated rosin-modified fluorosilicone rubbers (MR-FSR) were obtained. The effects of MR-VFS on the mechanical properties, oil resistance, thermal stability, and low-temperature performance were studied in detail. It was found that MR-VFS could increase the tearing strength and hightemperature thermal stability of fluorosilicone rubber. When the MR-VFS weight content reached to 2 wt %, the tearing strength of MR-FSR increased by 20.1% compared with that of common fluorosilicone rubber. However, MR-FSR showed a similar lowtemperature resistance and a little worse oil resistance. The morphological study showed that incorporation of maleated rosin could intensify the microphase separation of fluorosilicone rubber. © 2015 Wiley Periodicals, Inc. Source

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