Journal
POLYMER
Volume 90, Issue -, Pages 256-263Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2016.03.022
Keywords
Thermoplastic polyurethane; Microdomain morphology; Carbon nanotubes
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Funding
- Parker Hannifin Corporation
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Carbon nanotubes (CNTs) can be effective in influencing the hard domain (HD) and soft domain (SD) morphology in thermoplastic polyurethanes (TPU), and their combination with cellulose nanocrystals (CNCs) can maximize these effects in TPU composites. Atomic force microscopy (AFM) indicated that TPU morphology exhibits multi-scale phase separation characterized by heterogeneous morphologies at the micro-and nano-scales. CNTs appear to preferentially aggregate in the HD regions, favoring the nucleation and growth of smaller and more distributed HD spherulites, while thermal analyses confirmed a significant changes in the crystallization behavior of TPU nanocomposites. Scanning electron microscopy (SEM) analyses performed on TPU nanocomposites prepared by in-situ polymerization and compression molding suggested that incorporation of a small amount of CNCs can have a positive effect on CNT dispersion and favor a more homogeneous distribution. (C) 2016 Elsevier Ltd. All rights reserved.
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