期刊
POLYMER INTERNATIONAL
卷 64, 期 11, 页码 1607-1616出版社
WILEY
DOI: 10.1002/pi.4960
关键词
morphology; segmented polyurethanes; isosorbide; chain extender
资金
- Honeywell
- Division of Chemistry (CHE)
- Division of Materials Research (DMR)
- National Science Foundation [NSF/CHE-1346572]
- US DOE [DE-AC02-06CH11357]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1346572] Funding Source: National Science Foundation
Isosorbide, a cyclic, rigid and renewable diol, was used as a chain extender in two series of thermoplastic polyurethanes (PUs). Isosorbide was used alone or in combination with butanediol to examine the effects on the morphology of PU. Two series of materials were prepared-one with dispersed hard domains in a matrix of polytetramethylene ether glycol soft segments of molecular weight 1400gmol(-1) (at 70wt% soft segment concentration, SSC) and the other with co-continuous soft and hard phases at 50wt% SSC. We investigated the detailed morphology of these materials with optical and atomic force microscopy, as well as ultra-small-angle X-ray scattering. The atomic force microscopy measurements confirmed the different morphologies in PUs with 50wt% SSC and with 70wt% SSC. Small-angle X-ray scattering data showed that in PU with 70wt% SSC, the hard domain size varied between 2.4 and 2.9nm, and decreased with increasing isosorbide content. In PU with 70wt% SSC, we found that the correlation length and average repeat distances became smaller with increasing isosorbide content. We estimated the thickness of the diffuse phase boundary for PU with 70wt% SSC to be ca 0.5nm, decreasing slightly with increasing isosorbide content. (c) 2015 Society of Chemical Industry
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