Micromechanisms of deformation and recovery in thermoplastic vulcanizates

Boyce, Mary C.; Socrate, Simona; Kear, K.L.; Yeh, Oscar C.; Shaw, Karla

doi:10.1016/s0022-5096(00)00075-2

Cited by 67 publications

(27 citation statements)

References 13 publications

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“…These domains experience negligible strain but undergo large rotations. This local behavior has also been observed to be a deformation mechanism in thermoplastic vulcanizates (Boyce et al, 2001).…”

Section: Article In Pressmentioning

confidence: 66%

“…Initially, the oblique array is observed to be linearly elastic with homogeneous and gradual compression of the circular holes (see images of the deformed configuration at strains of 0.02, 0.10 for Specimen 4 in Fig. 4 (right)); at this stage the deformation is accommodated by local shearing of the diagonal matrix domains, a mechanism that has also been found in thermoplastic vulcanizates (Boyce et al, 2001).…”

Section: Circular Holes On An Oblique Latticementioning

confidence: 69%

See 1 more Smart Citation

Mechanics of deformation-triggered pattern transformations and superelastic behavior in periodic elastomeric structures

Bertoldi

Boyce

Deschanel

et al. 2008

Journal of the Mechanics and Physics of Solids

298

220

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Section: Article In Pressmentioning

confidence: 66%

Section: Circular Holes On An Oblique Latticementioning

confidence: 69%

Mechanics of deformation-triggered pattern transformations and superelastic behavior in periodic elastomeric structures

Bertoldi

Boyce

Deschanel

et al. 2008

Journal of the Mechanics and Physics of Solids

298

220

View full text Add to dashboard Cite

“…This behavior is common in thermoplastic elastomers and is attributed to the effect of the thermo-mechanical history on chain conformation and phase domains distribution. 30,31 Thus, the shape recovery was also calculated with respect to the deformations of the previous cycle. Table IV summarizes the shape memory properties for the SPU 2000 with different contents of HS and for the SPU 2000 reinforced with 1 wt % cellulose added after reaction.…”

Section: Shape Memory Effectmentioning

confidence: 99%

Nanocomposites made from cellulose nanocrystals and tailored segmented polyurethanes

Auad

Mosiewicki

Richardson

et al. 2009

J of Applied Polymer Sci

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The effect of the addition of microcrystalline cellulose nanofibers into linear segmented polyurethanes (SPU) was investigated. The polymers were synthesized with 4,4-methylene-bisphenyldiisocyanate (MDI) and poly (tetramethyleneglycol) (PTMG) with 1,4-butanediol (BD) as chain extender. The nanocrystals were introduced during the PU polymerization, which resulted in cellulose nanofibrils covalently linked to the polymer. The interactions between the cellulose nanofibrils and the matrix lead to interesting changes in the behavior of the PU, with the hard segment (HS) phase being more affected by these interactions. SPUs with different contents of HS were synthesized to better understand these effects (23 to 45 wt %). Thermal, thermo-mechanical and mechanical characterization of the nanocomposites were performed. In general, the nanocellulose favored the phase separation between the soft and hard domains generating an upward shift in the melting temperatures of the crystalline phases, an increase in the Young's modulus and a decrease in deformation at break.Comparison of the unfilled polymer responses and that of the nanocomposites showed that by increasing cellulose content, increased dynamic storage and tensile modulus as well as melting temperatures and enthalpy of melting of the soft domains can be achieved. Addition of cellulose during the polymerization essentially erased the potential shape memory behavior originally displayed by some of the SPU. However, a sample prepared by adding the cellulose nanocrystals after the reaction showed that the mechanical properties were still improved, while the shape memory behavior of the polymer was preserved.

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“…Several models have been suggested to answer this question (41)(42)(43)(44)(45)(46)(47). Inoue group first analyzed the origin of rubber elasticity in TPVs (43).…”

Section: Mechanical and Rheological Propertiesmentioning

confidence: 99%

“…In a series of works on the TPVs, Boyce et al also analyzed such unusual elasticity of TPVs by deformation analysis using stress-strain curve of TPVs with a constitutive model and/or simulation (44)(45)(46). In particular, Boyce et al reported the important role of matrix ligament thickness in controlling the initial stiffness and flow stress of the TPVs (45); thinner ligaments lead to earlier matrix yielding and thus earlier formation of the pseudocontinuous rubber phase.…”

Section: Mechanical and Rheological Propertiesmentioning

confidence: 99%