Deformation behavior of poly(dimethyl siloxane) networks. I. Applicability of various theories to modulus prediction

Venkatraman, Subbu S.

doi:10.1002/app.1993.070480806

Cited by 13 publications

(6 citation statements)

References 23 publications

(2 reference statements)

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“…6 together with a fit of the affine model to the 2C 1 constant. It can be seen that the plateau modulus predicted from 2C 1 + 2C 2 is in good agreement with the plateau modulus predicted taking into account all experimental data, and furthermore the plateau modulus of 2C 1 is very close to the value of 0.12 according to the result of Venkatraman [140]. The agreement between the affine model and the 2C 1 constant is poor.…”

Section: Resultssupporting

confidence: 77%

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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Section: Resultssupporting

confidence: 77%

Some experimental results for the end-linked polydimethylsiloxane network system

Larsen

Sommer‐Larsen²,

Hassager

2004

E-Polymers

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“…The values of log G 0 observed depend on the frequency applied. This may indicate that these networks have unattached chains [35].…”

Section: Resultsmentioning

confidence: 99%

“…The shear storage ðG 0 Þ and shear loss ðG 00 Þ moduli of PDMS networks prepared by Pt-catalyzed hydrosilylation crosslinking of a,v-bis(divinyl)PDMS and tetrakis(dimethylsiloxy)silane have been reported [35]. G 0 and G 00 for V were measured at frequencies of 1, 5, and 10 Hz (Figs.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of terminal Si–H irregular tetra-branched star polysiloxanes. Pt-catalyzed hydrosilylation with unsaturated epoxides. Polysiloxane films by photo-acid catalyzed crosslinking

Cai

Weber

2004

Polymer

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“…The average mesh size ξ , defined as the linear distance between two adjacent crosslinks, was calculated from the swelling and rheological data according to the theories summarized by Venkatraman and Peppas – :

G^{'} = 0.5 \times (|, \frac{d R T}{M_{c}}) C_{x}

{({\bar{r_{0}}}^{2})}^{1 / 2} = l {(2 M_{normalc} / M_{normalr})}^{1 / 2} {C_{n}}^{1 / 2}

Q_{s} = Q = true(W_{2} - W_{1} true) / W_{1}

V_{2, s} = {((Q_{normals} + 1) (ρ_{2} / ρ_{1}))}^{- 1}

ξ = {(V_{2, normals})}^{- 1 / 3} {({\bar{r_{0}}}^{2})}^{1 / 2}

where G ′ is the shear storage...…”

Section: Methodsmentioning

confidence: 99%

“…The average mesh size n, defined as the linear distance between two adjacent crosslinks, was calculated from the swelling and rheological data according to the theories summarized by Venkatraman 34,35 and Peppas [36][37][38] :…”

Section: Rheological Characterizationmentioning

confidence: 99%

Synthesis of stiffness‐tunable and cell‐responsive Gelatin–poly(ethylene glycol) hydrogel for three‐dimensional cell encapsulation

Cao

Lee

Peled

et al. 2016

J Biomedical Materials Res

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Biosynthetic poly(ethylene glycol) (PEG)-based hydrogels have been extensively investigated as extracellular matrix (ECM) mimicking gels as they retain the benefits of both ECM (biological cues) and synthetic hydrogels (tunable mechanical properties). In this article, we developed and characterized a new gelatin-PEG (GP) hydrogel that retains the benefits of gelatin and synthetic hydrogels. In this strategy, the thiolation of gelatin was accomplished by reacting with Traut's reagent; the thiolated gelatin was then conjugated to one end of PEG diacrylate (PEGDA) by Michael-type addition reaction. Two kinds of GP precursors, GP30 and GP60, were synthesized by changing the amount of Traut's reagent, while the weight ratio between thiolated-gelatin and PEGDA of GP30 and GP60 was 1.451:1 and 0.785:1, respectively. Finally, neonatal human dermal fibroblasts were encapsulated into the hydrogel by cross-linking the remaining double bonds of precursor under ultraviolet light. These GP hydrogels can encapsulate the fibroblasts in situ with high cell viability. Moreover, the behaviors of cells within the GP hydrogels can be modulated by varying the cross-linking density of GP hydrogel (storage modulus from 40 to 2000 Pa). In particular, this article showed that a minimum amount of cell-binding motifs (gelatin >2.30 wt/vol % and 44.0% dry weight percentage) are required for attachment; and appropriate initial rheological and structural properties (storage modulus <∼100 Pa and mesh size >∼150 nm) can accelerate the attachment of cells and improve cell viability. Hence, this mixed-hydrogel platform allows an easily control hydrogel structure and modulates cell behavior to reconstruct new tissue in the three-dimensional microenvironments. © 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 104A: 2401-2411, 2016.

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Deformation behavior of poly(dimethyl siloxane) networks. I. Applicability of various theories to modulus prediction

Cited by 13 publications

References 23 publications

Some experimental results for the end-linked polydimethylsiloxane network system

Some experimental results for the end-linked polydimethylsiloxane network system

Synthesis of terminal Si–H irregular tetra-branched star polysiloxanes. Pt-catalyzed hydrosilylation with unsaturated epoxides. Polysiloxane films by photo-acid catalyzed crosslinking

Synthesis of stiffness‐tunable and cell‐responsive Gelatin–poly(ethylene glycol) hydrogel for three‐dimensional cell encapsulation

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