Cavitation-Induced Stiffness Reductions in Quantum Dot–Polymer Nanocomposites

Raja, Shilpa N.; Luong, Andrew J.; Zhang, Wencong; Lin, Liwei; Ritchie, Robert O.; Alivisatos, A. Paul

doi:10.1021/acs.chemmater.5b04165

Title: Cavitation-Induced Stiffness Reductions in Quantum Dot–Polymer Nanocomposites

Journal Article · Tue Apr 05 00:00:00 EDT 2016 · Chemistry of Materials

DOI:https://doi.org/10.1021/acs.chemmater.5b04165· OSTI ID:1532185

Raja, Shilpa N. ^[1]; Luong, Andrew J. ^[2]; Zhang, Wencong ^[2]; Lin, Liwei ^[2]; Ritchie, Robert O. ^[1]; Alivisatos, A. Paul ^[3]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Univ. of California, Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Univ. of California, Berkeley, CA (United States); Kavli Energy NanoScience Inst., Berkeley, CA (United States)

The elastic stiffness of two polymer nanocomposite systems is investigated. The nanoscale fillers comprise cadmium selenide (CdSe, ~4 nm) and cadmium selenide/cadmium sulfide (CdSe/CdS, ~13 nm) quantum dots (QDs). The QDs are embedded within an electrospun structural block copolymer, poly(styrene-ethylene-butylene-styrene) (SEBS). Tensile testing shows a monotonic decrease in the tensile Young's modulus with increasing partially phase-separated QD concentration; this is to be compared to corresponding nanocomposites reinforced with nanorod (NR) and tetrapod (TP)-SEBS nanocomposites which show a monotonic increase with particle loading. While most studies to date emphasize the increase in Young's modulus in polymer nanocomposites at higher reinforcement loadings, few focus on the tunability of the modulus from reductions in stiffness. The present work reveals up to an ~80% reduction in tensile Young's modulus with the addition of 5 vol % of QDs to electrospun SEBS. In this study, we sought mechanistic insight into this reduction in composite stiffness using a 2D lattice spring model. Simulation results reveal that the stiffness decrease with the addition of QD reinforcements is likely due to cavitation in the polymer in the vicinity of the QD aggregates arising from polymer debonding under tension. We anticipate that this study, performed with a commonly used structural rubber, may find use in designing polymer-matrix nanocomposite fibers with specific Young's moduli for applications requiring a tunable lower stiffness material.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1532185

Journal Information:: Chemistry of Materials, Vol. 28, Issue 8; ISSN 0897-4756

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 21 works

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