SiO2 Reinforcement and Morphology of a Novel Poly(imide-siloxane)-Based Thermal Plastic Elastomer Composite
| Autor: | Kuan-Pin Chen, Wen-Chang Liaw, Li-Wen Fu, Yu-Lin Cheng, Po-Chen Huang |
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| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | Polymer Journal. 41:822-834 |
| ISSN: | 1349-0540 0032-3896 |
| Popis: | Silica (SiO2) was used for the reinforcement of the poly(imide-siloxane) (PIS)-based thermal plastic elastomer. Tri-methylsilyl modified SiO2 was incorporated in the copolymer matrix to obtain the PIS/SiO2 composties. In preparing the PIS/SiO2 composite, the modified MeOH/THF solvent system provided a homogeneous reaction environment by offering good solubilities for the reactants and the intermediates while facilitating the dispersion of SiO2. The trimethylsilyl group modified fume silica offered excellent interfacial compatibility and kept the microphase separation at desirable level. SEM studies showed that such surface modification improved the dispersion of SiO2 in the copolymer matrix. Morphological and thermal studies revealed the likelihood of a spatial rearrangement of the long chain alternating pyromellitic dianhydride/polydimethyl siloxane (PMDA/PDMS) soft segments leading to a macroscopically homogeneous composite. Such spatial rearrangement further stabilized the microphase separation which is necessary for exhibiting TPE characteristics. The obtained composites have better thermal and mechanical properties than bare PIS copolymer. An elongation at break of 989% was obtained for the PIS/SiO2 composite at silica content of 3 wt%. |
| Databáze: | OpenAIRE |
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