Characterization of thermoplastic interpenetrating polymer networks by various thermal analysis techniques

Vatalis, A. S.; Delides, C. G.; Georgoussis, George K.; Kyritsis, Apostolos; Grigorieva, O. P.; Sergeeva, L. M.; Brovko, A. A.; Zimich, O. N.; Shtompel, V. І.; Neagu, Eugen R.; Pissis, P.

doi:10.1016/s0040-6031(01)00420-8

Cited by 28 publications

(31 citation statements)

References 11 publications

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“…This cannot be explained by partial miscibility or interphase phenomena since in both cases an increase of the glass transition should be expected in these polymers. A decrease of the glass transition temperature has been found in some amorphous polymer confined in nanometric three-dimensional domains [34][35][36] and one can speculate that the dispersion of the PCL phase in nanometric domains dispersed between the hard segment blocks could produce the decrease of their glass transition temperature. The increment of the heat capacity in the glass transition and the intensity of the a relaxation decrease as the crystalline fraction of PCL decreases in PUUs as it should (Table I and Figs.…”

Section: Discussionmentioning

confidence: 99%

Segmented poly(urethane‐urea) elastomers based on polycaprolactone: Structure and properties

May-Hernandez

Hernández-Sánchez

Ribelles

et al. 2010

J of Applied Polymer Sci

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A series of segmented poly(urethane-urea) polymers have been synthesized varying the hard segments content, based on the combination of polycaprolactone diol and aliphatic diisocyanate (Bis(4-isocyanatocyclohexyl) methane), using diamine (1,4-Butylenediamine) as the chain extender. The microstructure and properties of the material highly depend on the hard segments content (from 14 to 40%). These PUUs with hard segment content above 23% have elastomeric behaviors that allow high recoverable deformation. The chemical structure and hydrogen bonding interactions were studied using FTIR and atomic force microscopy, which revealed phase separation that was also confirmed by DSC, dynamic-mechanical, and dielectric spectroscopy.

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Section: Discussionmentioning

confidence: 99%

Segmented poly(urethane‐urea) elastomers based on polycaprolactone: Structure and properties

May-Hernandez

Hernández-Sánchez

Ribelles

et al. 2010

J of Applied Polymer Sci

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“…Thermally stimulated depolarization currents (TSDC) is a special dielectric technique in the temperature domain. It roughly corresponds to measuring isochronally dielectric loss at a low equivalent frequency of the order of mHz, 33 typically not accessible by conventional dielectric techniques.…”

Section: Macromoleculesmentioning

confidence: 99%

Reduced Phase Separation and Slowing of Dynamics in Polyurethanes with Three-Dimensional POSS-Based Cross-Linking Moieties

et al. 2015

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Octa-OH-functional POSS has been incorporated into a model polyurethane elastomer as a comparatively massive and notionally "robust" 3-dimensional cross-linking core. The effects of this cross-linking moiety on the morphology and molecular dynamics of the system are studied over a range of size and time scales. Microscopy, scattering, spectroscopic, thermal, and dielectric techniques, in agreement with each other, show that the covalent inclusion of the crosslinking particles restricts microphase separation, inhibits the formation of hard-block domains, and decelerates the motional dynamics of the polyurethane backbone. The effects on both the morphology and the dynamics of the polyurethane system are not continuous but occur in a steplike manner in the loading region of 4−6 wt % POSS. This critical region is thought to correspond to a sterically induced transition from one dominant morphology (microphase segregated) to an increasingly homogeneous nanophase segregated domain morphology. Contrary to expectations, cross-linking, even by the presumably rigid siliceous nanoparticles, reduces the mechanical modulus. In conjunction with the reduction of microphase separation, this observation indicates that the hard microdomains reinforce the polymer more effectively than the chemical cross-links.

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“…Polymers are the most popular objects of TSDC investigations typically parallel to DRS, DSC, and other thermal analysis techniques [1][2][3][4][5][6][7][8][9][10][11][12][13][14][217][218][219]. By using these methods, many properties of polymers can be investigated such as chemical relaxation [220], cold crystallization [221] and stabilizer effects [222], influence of space charges on molecular microstructure [223] and thermal-induced structural changes [224,225], physical aging [226] and the effects of gamma and neutron radiation [227].…”

Section: Relaxation Phenomena In Polymersmentioning

confidence: 99%

TSDC spectroscopy of relaxational and interfacial phenomena

Gun'ko

Zarko

Goncharuk

et al. 2007

Advances in Colloid and Interface Science

133

167

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Characterization of thermoplastic interpenetrating polymer networks by various thermal analysis techniques

Cited by 28 publications

References 11 publications

Segmented poly(urethane‐urea) elastomers based on polycaprolactone: Structure and properties

Segmented poly(urethane‐urea) elastomers based on polycaprolactone: Structure and properties

Reduced Phase Separation and Slowing of Dynamics in Polyurethanes with Three-Dimensional POSS-Based Cross-Linking Moieties

TSDC spectroscopy of relaxational and interfacial phenomena

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