Journal
EUROPEAN POLYMER JOURNAL
Volume 48, Issue 2, Pages 260-274Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2011.11.009
Keywords
Epoxy-POSS hybrid; POSS; Thermomechanical properties; Polymer nanocomposite
Categories
Funding
- Grant Agency of the Czech Republic [IAA 400500701]
- Academy of Sciences of the Czech Republic [M200500903]
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The epoxy-POSS hybrid networks with POSS bound as pendant cages or with untethered POSS dispersed in the matrix were prepared and their structure was controlled. Formation of the hybrid network was followed by chemorheology. In situ development of physical crosslinks in the pregel stage of the network build-up was observed in case of the hybrids with tethered POSS. The complex effect of POSS on mechanical properties is manifested by either increase or decrease in rubbery modulus of different hybrids. This behavior reflects (a) reinforcement due to POSS hard aggregates. (b) diminishing of crosslinking density of the epoxy network by tethered monofunctional POSS and (c) physical crosslinking via PUSS domains. Theories of network formation and rubbery elasticity as well as the model of mechanicalbehavior of particulate composites were applied to interpret the mechanical properties of the hybrids. (C) 2011 Elsevier Ltd. All rights reserved.
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