Matrix-Free Polymer Nanocomposite Thermoplastic Elastomers

Yucheng Huang, Yang Zheng, Amrita Sarkar, Yanmei Xu, Morgan Stefik, Brian C. Benicewicz

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

Thermoplastic elastomer (TPE) grafted nanoparticles were prepared by grafting block copolymer poly(styrene-block-(n-butyl acrylate)) onto silica nanoparticles (NPs) via surface-initiated reversible addition-fragmentation chain transfer (RAFT) polymerization. The effects of polymer chain length and graft density on the mechanical properties were investigated using films made solely from the grafted NPs. The ultimate tensile stress and elastic modulus increased with increasing PS chain length. The dispersion of the silica NPs and the microphase separation of the block copolymer in the matrix-free polymer nanocomposite were investigated using small-angle X-ray scattering (SAXS), transmission electron microscopy (TEM), differential scanning calorimetry (DSC), and dynamic mechanical analysis (DMA). The higher polymer graft density TPEs exhibited better microphase separation of the block copolymers and more uniform silica NP dispersion than lower polymer graft density TPEs with similar polymer chain length and composition.

Original languageEnglish
Pages (from-to)4742-4753
Number of pages12
JournalMacromolecules
Volume50
Issue number12
DOIs
StatePublished - 27 Jun 2017

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