Synthesis of Shape Memory Polyurethane/Nanoclay Composites: Chemical Structure and Interactions between Polymer and Nanoclay Particles
| Autor: | Mahnaz sadat Haghayegh, Gity Mir Mohamad Sadeghi, bahman shamayeli |
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| Jazyk: | perština |
| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | علوم و تکنولوژی پلیمر, Vol 25, Iss 1, Pp 19-30 (2012) |
| Druh dokumentu: | article |
| ISSN: | 1016-3255 2008-0883 |
| DOI: | 10.22063/jipst.2012.545 |
| Popis: | Although there are many works published on shape memory polyurethanes, but no report is found on PCL-based polyurethane composite using PCL with molecular weight of 2000 g/mol and nanoclay particles via in-situ polymerization. In this work, we try to approach some problems concerning the chemical structure, dispersion of a noparticles in the matrix and interaction between nanoparticles and polymer in shape memory of PCL (Mn= 2000 g/mol)-based polyurethane/nanoclay composites. While PCL (Mn= 2000 g/mol) polyurethane constituted the soft segments, MDI/BD formed the hard segments. The weight ratio of soft to hard segments was found to be 65/35. Composites were synthesized in presence 1 and 3 wt% of nanoclay (Cloisite®30B) via in-situ polymerization by a two-step method. Effect of nano particles on their interactions with polyurethane chains, crystallinity, mechanical properties and shape memory have been investigated using |
| Databáze: | Directory of Open Access Journals |
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