Free volumes in polymer nanocomposites

H. M. Chen; Ly James Lee; Jintao Yang; Xiaohong Gu; Y. C. Jean

doi:10.4028/www.scientific.net/MSF.607.177

Free volumes in polymer nanocomposites

H. M. Chen, Ly James Lee, Jintao Yang, Xiaohong Gu, Y. C. Jean

Institute of Biopharmaceutical Sciences

Research output: Contribution to journal › Conference article › peer-review

8 Scopus citations

Abstract

We have employed positron annihilation lifetime spectroscopy to measure the free volumes in nanocomposites of polystyrene with addition of carbon nanofiber (CNF) and carbon dioxide as a function of composition and of temperature. We found that the glass transition temperature (T_g) increases as a function of CNF compositions but significantly decreases as the exposure of CO₂. We also investigate the combination effect of CNF and CO ₂ and found that the CO₂ significantly weakens the bonding between PS and CNF interfaces. The T_g changes are compared with DSC.

Original language	English
Pages (from-to)	177-179
Number of pages	3
Journal	Materials Science Forum
Volume	607
DOIs	https://doi.org/10.4028/www.scientific.net/MSF.607.177
State	Published - Nov 2008
Event	9th International Workshop on Positron and Positronium Chemistry, PPC-9 - Wuhan, China Duration: 11 May 2008 → 15 May 2008

Keywords

Carbon nanofiber
Glass transition temperature
Nanocomposite
Polystyrene
Positron

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10.4028/www.scientific.net/MSF.607.177

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title = "Free volumes in polymer nanocomposites",

abstract = "We have employed positron annihilation lifetime spectroscopy to measure the free volumes in nanocomposites of polystyrene with addition of carbon nanofiber (CNF) and carbon dioxide as a function of composition and of temperature. We found that the glass transition temperature (Tg) increases as a function of CNF compositions but significantly decreases as the exposure of CO2. We also investigate the combination effect of CNF and CO 2 and found that the CO2 significantly weakens the bonding between PS and CNF interfaces. The Tg changes are compared with DSC.",

keywords = "Carbon nanofiber, Glass transition temperature, Nanocomposite, Polystyrene, Positron",

author = "Chen, {H. M.} and Lee, {Ly James} and Jintao Yang and Xiaohong Gu and Jean, {Y. C.}",

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TY - JOUR

T1 - Free volumes in polymer nanocomposites

AU - Chen, H. M.

AU - Lee, Ly James

AU - Yang, Jintao

AU - Gu, Xiaohong

AU - Jean, Y. C.

PY - 2008/11

Y1 - 2008/11

N2 - We have employed positron annihilation lifetime spectroscopy to measure the free volumes in nanocomposites of polystyrene with addition of carbon nanofiber (CNF) and carbon dioxide as a function of composition and of temperature. We found that the glass transition temperature (Tg) increases as a function of CNF compositions but significantly decreases as the exposure of CO2. We also investigate the combination effect of CNF and CO 2 and found that the CO2 significantly weakens the bonding between PS and CNF interfaces. The Tg changes are compared with DSC.

AB - We have employed positron annihilation lifetime spectroscopy to measure the free volumes in nanocomposites of polystyrene with addition of carbon nanofiber (CNF) and carbon dioxide as a function of composition and of temperature. We found that the glass transition temperature (Tg) increases as a function of CNF compositions but significantly decreases as the exposure of CO2. We also investigate the combination effect of CNF and CO 2 and found that the CO2 significantly weakens the bonding between PS and CNF interfaces. The Tg changes are compared with DSC.

KW - Carbon nanofiber

KW - Glass transition temperature

KW - Nanocomposite

KW - Polystyrene

KW - Positron

UR - http://www.scopus.com/inward/record.url?scp=64349105600&partnerID=8YFLogxK

U2 - 10.4028/www.scientific.net/MSF.607.177

DO - 10.4028/www.scientific.net/MSF.607.177

M3 - Conference article

AN - SCOPUS:64349105600

SN - 0255-5476

VL - 607

SP - 177

EP - 179

JO - Materials Science Forum

JF - Materials Science Forum

T2 - 9th International Workshop on Positron and Positronium Chemistry, PPC-9

Y2 - 11 May 2008 through 15 May 2008

ER -

Free volumes in polymer nanocomposites

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Keywords

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