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Study on Preparation and Flame Retardancy of Halogen Free Styrene-containing Polymer Composites

Author: LiQingZuo
Tutor: LiuJiChun
School: Henan University of Science and Technology
Course: Polymer Chemistry and Physics
Keywords: Polystyrene Flame retardant properties In situ polymerization Polymer composites
CLC: TB332
Type: Master's thesis
Year: 2009
Downloads: 140
Quote: 3
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Abstract


The styrene polymer has been widely used due to having good dimensional stability, electrical insulating properties and processing performance. However, this type of polymer heat temperature is not high, combustible, drip drip severe and release a lot of smoke in the combustion process, so its flame-retardant and smoke suppression processing is very necessary. Physical filling method and the chemical modification method combination, halogen-free flame retardant prepared by a variety of modified styrene-containing polymer composites, focusing on the flame retardant properties of the composites and flame retardant mechanism thesis as follows : 1. the molten compound prepared PS / MCA, PS / PPO PS / MCA / PPO and PS / MH composite material, respectively, using an oxygen index (OI) instrument and cone calorimeter instrument (Cone) Composites flame-retardant properties were evaluated. The results showed that: With the increase in the amount of flame retardants, the above-mentioned composite material OI gradually increased, the heat release rate (HRR), the mass loss rate (MLR) were gradually reduced, and exhibit good flame retardancy and smoke suppression. The same amount of flame retardant PS / MCA / PPO retardant properties of the composite material than PS / MCA and PS / PPO composite material better, indicating that the MCA better synergy with the PPO. The MH heat treatment, the preparation of a series of PS / t-MH composites, studies show that MH flame retardant mechanism of gas-phase flame retardant and condensed phase flame retardant interaction, provides a clear flame retardant mechanism of MH experimental evidence. In situ polymerization cross-linking St / MH / DVB composite. The study showed that the OI of crosslinked PS / divinyl benzene (DVB) as a crosslinking agent prepared MH composites increases with the increase of the content of the MH. In same MH dosage, St / n-horizontal burning rate of the composite material and OI ratio St / m-MH MH / DVB / DVB composites exhibit more excellent flame retardancy. Melt intercalation method allows the of SMA molecular chain in the molten state into the OMMT lamellar form intercalated nanocomposites. The research shows that the more superior thermal stability and flame retardant properties of SMA / OMMT nanocomposites than that of pure SMA. Surface alkali treatment of SMA and SAM / OMMT composites can significantly improve the performance into carbon; thermal stability so that the two materials under the same conditions, after KOH treatment, the heat resistance of the composite material and flame retardant properties better than the heat resistance and flame retardant properties of the NaOH-treated composite material.

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Composite materials > Non-metallic composite materials
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