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Effects of thermal annealing on the viscoelastic properties and morphology of bimodal hard/soft latex blends

Colombini, Didier LU ; Hassander, Helen LU ; Karlsson, Ola LU and Maurer, Frans LU (2005) In Journal of Polymer Science. Part B, Polymer Physics 43(17). p.2289-2306
Abstract
The effects of thermal annealing on the viscoelastic properties and morphology of films prepared from bimodal latex blends containing equal weight fractions of soft and hard latex particles with controlled sizes were investigated. The thermal and viscoelastic properties of as-dried and annealed samples were investigated with differential scanning calorimetry and dynamic mechanical analysis (DMA). Throughout the thermal annealing, the latex blend morphologies were also followed with atomic force microscopy and transmission electron microscopy (TEM). A particulate morphology, consisting of hard particles evenly dispersed in a continuous soft phase, was observed in the TEM micrographs of the as-dried latex blends and resulted in an... (More)
The effects of thermal annealing on the viscoelastic properties and morphology of films prepared from bimodal latex blends containing equal weight fractions of soft and hard latex particles with controlled sizes were investigated. The thermal and viscoelastic properties of as-dried and annealed samples were investigated with differential scanning calorimetry and dynamic mechanical analysis (DMA). Throughout the thermal annealing, the latex blend morphologies were also followed with atomic force microscopy and transmission electron microscopy (TEM). A particulate morphology, consisting of hard particles evenly dispersed in a continuous soft phase, was observed in the TEM micrographs of the as-dried latex blends and resulted in an enhancement of the mechanical film properties at temperatures between the a relaxations of the soft and hard phases in the DMA thermograms. As soon as the thermal annealing involved temperatures higher than the glass-transition temperature of the hard phase, the hard particles progressively lost their initial spherical shape and formed a more or less continuous phase in the latex blends. This induced coalescence of the hard particles was confirmed by the association of the experimental viscoelastic data with theoretical predictions, based on self-consistent mechanical models, which were performed by the consideration of either a particulate or cocontinuous morphology for the bimodal latex blends. (c) 2005 Wiley Periodicals, Inc. (Less)
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organization
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type
Contribution to journal
publication status
published
subject
in
Journal of Polymer Science. Part B, Polymer Physics
volume
43
issue
17
pages
2289 - 2306
publisher
John Wiley & Sons
external identifiers
  • wos:000231370000004
  • scopus:26944472075
ISSN
0887-6266
DOI
10.1002/polb.20461
language
English
LU publication?
yes
id
7adadd5d-3a96-45d2-8f7c-4f0be5a3868c (old id 152526)
date added to LUP
2007-07-11 09:04:28
date last changed
2017-08-20 04:33:09
@article{7adadd5d-3a96-45d2-8f7c-4f0be5a3868c,
  abstract     = {The effects of thermal annealing on the viscoelastic properties and morphology of films prepared from bimodal latex blends containing equal weight fractions of soft and hard latex particles with controlled sizes were investigated. The thermal and viscoelastic properties of as-dried and annealed samples were investigated with differential scanning calorimetry and dynamic mechanical analysis (DMA). Throughout the thermal annealing, the latex blend morphologies were also followed with atomic force microscopy and transmission electron microscopy (TEM). A particulate morphology, consisting of hard particles evenly dispersed in a continuous soft phase, was observed in the TEM micrographs of the as-dried latex blends and resulted in an enhancement of the mechanical film properties at temperatures between the a relaxations of the soft and hard phases in the DMA thermograms. As soon as the thermal annealing involved temperatures higher than the glass-transition temperature of the hard phase, the hard particles progressively lost their initial spherical shape and formed a more or less continuous phase in the latex blends. This induced coalescence of the hard particles was confirmed by the association of the experimental viscoelastic data with theoretical predictions, based on self-consistent mechanical models, which were performed by the consideration of either a particulate or cocontinuous morphology for the bimodal latex blends. (c) 2005 Wiley Periodicals, Inc.},
  author       = {Colombini, Didier and Hassander, Helen and Karlsson, Ola and Maurer, Frans},
  issn         = {0887-6266},
  language     = {eng},
  number       = {17},
  pages        = {2289--2306},
  publisher    = {John Wiley & Sons},
  series       = {Journal of Polymer Science. Part B, Polymer Physics},
  title        = {Effects of thermal annealing on the viscoelastic properties and morphology of bimodal hard/soft latex blends},
  url          = {http://dx.doi.org/10.1002/polb.20461},
  volume       = {43},
  year         = {2005},
}