Concentration-Dependent Mechanical Behavior of Physically Assembled Triblock Copolymer Gels

2020 ◽  
Vol 2 (12) ◽  
pp. 5388-5397
Author(s):  
Satish Mishra ◽  
Rosa Maria Badani Prado ◽  
Santanu Kundu
Keyword(s):  
Mechanical Behavior ◽  
Triblock Copolymer ◽  
Copolymer Gels

scholarly journals Decoupling of Mechanical and Transport Properties in Organogels via Solvent Variation

Gels ◽  
2021 ◽  
Vol 7 (2) ◽  
pp. 61
Author(s):  
Kenneth P. Mineart ◽  
Cameron Hong ◽  
Lucas A. Rankin
Keyword(s):  
Mechanical Properties ◽  
Mechanical Behavior ◽  
Transdermal Drug Delivery ◽  
Triblock Copolymer ◽  
Polymer Concentration ◽  
Mineral Oil ◽  
Solute Diffusion ◽  
Oil Viscosity ◽  
Chain Entanglement ◽  
Mineral Oils

Organogels have recently been considered as materials for transdermal drug delivery media, wherein their transport and mechanical properties are among the most important considerations. Transport through organogels has only recently been investigated and findings highlight an inextricable link between gels’ transport and mechanical properties based upon the formulated polymer concentration. Here, organogels composed of styrenic triblock copolymer and different aliphatic mineral oils, each with a unique dynamic viscosity, are characterized in terms of their quasi-static uniaxial mechanical behavior and the internal diffusion of two unique solute penetrants. Mechanical testing results indicate that variation of mineral oil viscosity does not affect gel mechanical behavior. This likely stems from negligible changes in the interactions between mineral oils and the block copolymer, which leads to consistent crosslinked network structure and chain entanglement (at a fixed polymer concentration). Conversely, results from diffusion experiments highlight that two penetrants—oleic acid (OA) and aggregated aerosol-OT (AOT)—diffuse through gels at a rate inversely proportional to mineral oil viscosity. The inverse dependence is theoretically supported by the hydrodynamic model of solute diffusion through gels. Collectively, our results show that organogel solvent variation can be used as a design parameter to tailor solute transport through gels while maintaining fixed mechanical properties.

Structural Development and Adhesion of Acrylic ABA Triblock Copolymer Gels

1999 ◽  
Vol 32 (21) ◽  
pp. 7251-7262 ◽  
Author(s):  
Cynthia M. Flanigan ◽  
Alfred J. Crosby ◽  
Kenneth R. Shull
Keyword(s):  
Triblock Copolymer ◽  
Structural Development ◽  
Copolymer Gels ◽  
Aba Triblock Copolymer

Self-Assembly and Stress Relaxation in Acrylic Triblock Copolymer Gels

2007 ◽  
Vol 40 (4) ◽  
pp. 1218-1226 ◽  
Author(s):  
Michelle E. Seitz ◽  
Wesley R. Burghardt ◽  
K. T. Faber ◽  
Kenneth R. Shull
Keyword(s):  
Stress Relaxation ◽  
Self Assembly ◽  
Triblock Copolymer ◽  
Copolymer Gels

“Butterfly”-like patterns of triblock copolymer gels as observed by small-angle neutron scattering

1996 ◽  
Vol 34 (16) ◽  
pp. 2739-2745 ◽  
Author(s):  
N. Mischenko ◽  
K. Reynders ◽  
K. Mortensen ◽  
N. Overberg ◽  
H. Reynaers
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Triblock Copolymer ◽  
Copolymer Gels

Multiscale mechanical characterization of biomimetic physically associating gels

2006 ◽  
Vol 21 (8) ◽  
pp. 2084-2092 ◽  
Author(s):  
Thomas F. Juliano ◽  
Aaron M. Forster ◽  
Peter L. Drzal ◽  
Tusit Weerasooriya ◽  
Paul Moy ◽  
...  
Keyword(s):  
Triblock Copolymer ◽  
Injury Risk ◽  
Mechanical Response ◽  
Measurement Techniques ◽  
Synthetic Materials ◽  
Copolymer Gels ◽  
Ballistic Gelatin ◽  
Stress States ◽  
Impact Events

The mechanical response of living tissue is important to understanding the injury-risk associated with impact events. Often, ballistic gelatin or synthetic materials are developed to serve as tissue surrogates in mechanical testing. Unfortunately, current materials are not optimal and present several experimental challenges. Bulk measurement techniques, such as compression and shear testing geometries, do not fully represent the stress states and rate of loading experienced in an actual impact event. Indentation testing induces deviatoric stress states as well as strain rates not typically available to bulk measurement equipment. In this work, a ballistic gelatin and two styrene-isoprene triblock copolymer gels are tested and compared using both macroscale and microscale measurements. A methodology is presented to conduct instrumented indentation experiments on materials with a modulus far below 1 MPa. The synthetic triblock copolymer gels were much easier to test than the ballistic gelatin. Compared to ballistic gelatin, both copolymer gels were found to have a greater degree of thermal stability. All of the materials exhibit strain-rate dependence, although the magnitude of dependence was a function of the loading rate and testing method.

Phase behavior of SEBS triblock copolymer gels

2011 ◽  
Vol 49 (20) ◽  
pp. 1479-1491 ◽  
Author(s):  
Tanya L. Chantawansri ◽  
Andrew J. Duncan ◽  
Jan Ilavsky ◽  
Kristoffer K. Stokes ◽  
Michael C. Berg ◽  
...  
Keyword(s):  
Phase Behavior ◽  
Triblock Copolymer ◽  
Copolymer Gels
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