Crossover of the concentration dependence of swelling and elastic properties for polysiloxane networks crosslinked in solution

Urayama, Kenji; Kohjiya, Shinzo

doi:10.1063/1.471018

Cited by 56 publications

(69 citation statements)

References 57 publications

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“…; [13,43] while there were a few studies to report the crossover of the f m -dependence at f ÃÃ . Urayama et al [26] reported the crossover using the end-linked PDMS networks. This difference may be attributed to the difference of the network structure.…”

Section: Effect Of Swelling and Deswelling On The Mechanical Propertimentioning

confidence: 98%

Effect of Swelling and Deswelling on Mechanical Properties of Polymer Gels

Katashima

Chung

Sakai

2015

Macromolecular Symposia

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Summary: Polymer gels exhibit some unique features that are not seen in the uncrosslinked polymer system, rubber elasticity and swelling. In this paper, we review our recent studies towards the molecular understanding of the relationship between the elasticity and the swelling ratio using the Tetra-PEG gels. The dependence of the polymer volume fraction of interest state (f m ) on the elasticity exhibits the power-law behaviors and the crossovers at f Ã and f c due to the presence of the excluded volume effect and the supercoiling. The Obukhov model successfully describes the power-law behaviors. The fractal dimension of network strands (D f ) based on the stress-elongation relationships using the Pincus blob revealed that the gyration radius of the network strands decreases with deswelling in affine manner. As for the equilibrium swelling, the definite f 0 -dependences of f m and E s are observed due to the effect of the excluded volume effect at preparation state. The Obukhov model can predict this result, while the C Ã theorem cannot predict it. Using the polymer gels with precisely controlled network structures, we successfully verify the molecular models to describe the relationships between the elasticity and the swelling degree of polymer gels.

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Section: Effect Of Swelling and Deswelling On The Mechanical Propertimentioning

confidence: 98%

Effect of Swelling and Deswelling on Mechanical Properties of Polymer Gels

Katashima

Chung

Sakai

2015

Macromolecular Symposia

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“…If the network is crosslinked in bulk, entanglements are trapped whenever the PDMS chain length exceeds the entanglement molecular weight. On the other hand, in the system where PDMS is crosslinked in solution, the number of trapped entanglements is governed by the polymer concentration [24].…”

Section: Introductionmentioning

confidence: 99%

“…In some studies, the PDMS networks are cured for 2 -3 days at 75°C [10,22,23]. Furthermore a few authors crosslink the networks in solution [8,9,15,[24][25][26][27]. If the network is crosslinked in bulk, entanglements are trapped whenever the PDMS chain length exceeds the entanglement molecular weight.…”

Section: Introductionmentioning

confidence: 99%

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Some experimental results for the end-linked polydimethylsiloxane network system

Larsen

Sommer‐Larsen²,

Hassager

2004

E-Polymers

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Small-strain equilibrium modulus data of polydimethylsiloxane (PDMS) networks are reviewed. 58 different articles in the literature with values of the modulus of end-linked PDMS networks were found [1-58] including more than 250 values of the small-strain equilibrium modulus as function of variables in the crosslinking system. The dominating variable is shown to be the molecular weight of PDMS as expected, whereas the functionality of the crosslinker methylhydrosiloxane/dimethylsiloxane copolymer is shown to be less important in good agreement with the phantom model. The data collected was fitted to the phenomenological model of Langley and Graessley including an entanglement contribution. The fitted entanglement plateau (0.16 MPa) is in good agreement with literature values and with the theoretical prediction of the tube model. Experimental data for the Mooney-Rivlin constants was found and it was shown that C 2 is constant with increasing functionality. Furthermore it was found that trapped entanglements can be split into two categories, viz. locked entanglements contributing to the C 1 term and traditionally trapped entanglements contributing to C 2 .

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“…The trapped entanglements formed in the crosslinking stage are, however, not disentangled by swelling because the network topology is fixed upon crosslinking. In fact, several studies 16,17 have clearly revealed a significant contribution of the trapped entanglements to the small-strain modulus of fully swollen networks. On this basis, we simply expect the trapped entanglements to also contribute to a large-deformation behavior in the highly swollen state.…”

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confidence: 99%