Campus Units
Chemical and Biological Engineering
Document Type
Article
Research Focus Area
Advanced and Nanostructured Materials
Publication Version
Published Version
Publication Date
6-16-2020
Journal or Book Title
ACS Macro Letters
Volume
9
Issue
6
First Page
781
Last Page
787
DOI
10.1021/acsmacrolett.0c00211
Abstract
Here we report microphase-separated poly(styrene-block-dimethylsiloxane) (PS-b-PDMS) as a reinforcing filler in PDMS thermosets that overcomes the long-standing problem of aging in the processing of silica-reinforced silicone. Surprisingly, PS-b-PDMS reinforced composites display comparable mechanical performance to silica-modified analogs, even though the modulus of PS is much smaller than that of silica and there is no evidence of percolation with respect to the rigid PS domains. We have found that a few unique characteristics contribute to the reinforcing performance of PS-b-PDMS. The strong self-assembly behavior promotes batch-to-batch repeatability by having well-dispersed fillers. The structure and size of the fillers depend on the loading and characteristics of both filler and matrix, along with the shear effect. The reinforcing effect of PS-b-PDMS is mostly brought by the entanglements between the corona layer of the filler and the matrix, rather than the hydrodynamic reinforcement of the PS phase.
Rights
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.
Language
en
File Format
application/pdf
Recommended Citation
Shen, Liyang; Wang, Tung-Ping; Lin, Fang-Yi; Torres, Sabrina; Robison, Thomas; Kalluru, Sri Harsha; Hernández, Nacú B.; and Cochran, Eric W., "Polystyrene-block-Polydimethylsiloxane as a Potential Silica Substitute for Polysiloxane Reinforcement" (2020). Chemical and Biological Engineering Publications. 430.
https://lib.dr.iastate.edu/cbe_pubs/430
Comments
This article is published as Shen, Liyang, Tung-ping Wang, Fang-Yi Lin, Sabrina Torres, Thomas Robison, Sri Harsha Kalluru, Nacú B. Hernández, and Eric W. Cochran. "Polystyrene-block-Polydimethylsiloxane as a Potential Silica Substitute for Polysiloxane Reinforcement." ACS Macro Letters 9, no. 6 (2020): 781-787. To access the final edited and published work see DOI: 10.1021/acsmacrolett.0c00211.