A new study of glass transition of polymers by high pressure DSC

Yongli Mi; Sixun Zheng

doi:10.1016/S0032-3861(97)10357-3

A new study of glass transition of polymers by high pressure DSC

Yongli Mi^*
, Sixun Zheng

^*Corresponding author for this work

Department of Chemical and Biological Engineering

Research output: Contribution to journal › Journal Article › peer-review

32 Citations (Scopus)

Abstract

The glass transition temperatures of polycarbonate (PC) were measured by means of high pressure DSC in He, N₂, and CO₂ atmospheres. It was found that the glass transition temperature (T_g) of PC was independent in He with pressure up to 70 atm, whereas the T_g of PC shifted by 6° towards the lower temperature end in N₂ atmosphere when the pressure was 70 atm. The depression in T_g by high pressure CO₂ was found to be even more remarkable due to a stronger plasticization effect. It was also found that the glass transition for PC/CO₂ system exhibited an endothermic peak. It was believed that the endothermic behaviour resulted from the excessive desorption of the absorbed gas at T_g due to the increase in chain mobility. This conclusion was further confirmed by examining the glass transition behaviour of poly(vinyl benzoate) in CO₂ at 2 atm.

Original language	English
Pages (from-to)	3709-3712
Number of pages	4
Journal	Polymer
Volume	39
Issue number	16
DOIs	https://doi.org/10.1016/S0032-3861(97)10357-3
Publication status	Published - 1 Jun 1998

Keywords

Glass transition temperatures
High pressure DSC

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10.1016/S0032-3861(97)10357-3

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title = "A new study of glass transition of polymers by high pressure DSC",

abstract = "The glass transition temperatures of polycarbonate (PC) were measured by means of high pressure DSC in He, N2, and CO2 atmospheres. It was found that the glass transition temperature (Tg) of PC was independent in He with pressure up to 70 atm, whereas the Tg of PC shifted by 6° towards the lower temperature end in N2 atmosphere when the pressure was 70 atm. The depression in Tg by high pressure CO2 was found to be even more remarkable due to a stronger plasticization effect. It was also found that the glass transition for PC/CO2 system exhibited an endothermic peak. It was believed that the endothermic behaviour resulted from the excessive desorption of the absorbed gas at Tg due to the increase in chain mobility. This conclusion was further confirmed by examining the glass transition behaviour of poly(vinyl benzoate) in CO2 at 2 atm.",

keywords = "Glass transition temperatures, High pressure DSC",

author = "Yongli Mi and Sixun Zheng",

year = "1998",

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doi = "10.1016/S0032-3861(97)10357-3",

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TY - JOUR

T1 - A new study of glass transition of polymers by high pressure DSC

AU - Mi, Yongli

AU - Zheng, Sixun

PY - 1998/6/1

Y1 - 1998/6/1

N2 - The glass transition temperatures of polycarbonate (PC) were measured by means of high pressure DSC in He, N2, and CO2 atmospheres. It was found that the glass transition temperature (Tg) of PC was independent in He with pressure up to 70 atm, whereas the Tg of PC shifted by 6° towards the lower temperature end in N2 atmosphere when the pressure was 70 atm. The depression in Tg by high pressure CO2 was found to be even more remarkable due to a stronger plasticization effect. It was also found that the glass transition for PC/CO2 system exhibited an endothermic peak. It was believed that the endothermic behaviour resulted from the excessive desorption of the absorbed gas at Tg due to the increase in chain mobility. This conclusion was further confirmed by examining the glass transition behaviour of poly(vinyl benzoate) in CO2 at 2 atm.

AB - The glass transition temperatures of polycarbonate (PC) were measured by means of high pressure DSC in He, N2, and CO2 atmospheres. It was found that the glass transition temperature (Tg) of PC was independent in He with pressure up to 70 atm, whereas the Tg of PC shifted by 6° towards the lower temperature end in N2 atmosphere when the pressure was 70 atm. The depression in Tg by high pressure CO2 was found to be even more remarkable due to a stronger plasticization effect. It was also found that the glass transition for PC/CO2 system exhibited an endothermic peak. It was believed that the endothermic behaviour resulted from the excessive desorption of the absorbed gas at Tg due to the increase in chain mobility. This conclusion was further confirmed by examining the glass transition behaviour of poly(vinyl benzoate) in CO2 at 2 atm.

KW - Glass transition temperatures

KW - High pressure DSC

UR - https://www.webofscience.com/wos/woscc/full-record/WOS:000073915000014

UR - https://openalex.org/W2042314972

U2 - 10.1016/S0032-3861(97)10357-3

DO - 10.1016/S0032-3861(97)10357-3

M3 - Journal Article

SN - 0032-3861

VL - 39

SP - 3709

EP - 3712

JO - Polymer

JF - Polymer

IS - 16

ER -

A new study of glass transition of polymers by high pressure DSC

Abstract

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