Thermal imidization of the precursor of a liquid crystalline polyimide

Kumari P. Pramoda; Songlin Liu; Tai Shung Chung

doi:10.1002/mame.200290027

Thermal imidization of the precursor of a liquid crystalline polyimide

Kumari P. Pramoda^*, Songlin Liu, Tai Shung Chung

^*Corresponding author for this work

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

68 Scopus citations

Abstract

Imidization of the precursor of a liquid crystalline polyimide was investigated using modulated differential scanning calorimetry (MDSC), Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and thermogravimetric analyzer (TGA) coupled to FTIR (TG-IR). The FTIR study revealed that the rate and degree of imidization are functions of curing temperature and time. Imidization proceeds in two stages under isothermal condition. The initial weight loss up to 250 °C as observed from TGA was due to thermal cyclization, i.e., imidization process. The XPS analysis shows that the poly(amic acid) has two nitrogen 1s species at 400.3 and 399.2 eV possibly due to the isomerism of the dianhydride carbonyl, while liquid crystalline polyimide shows only a single nitrogen 1s species at 400.8 eV due to imide species.

Original language	English (US)
Pages (from-to)	931-937
Number of pages	7
Journal	Macromolecular Materials and Engineering
Volume	287
Issue number	12
DOIs	https://doi.org/10.1002/mame.200290027
State	Published - Dec 30 2002
Externally published	Yes

Keywords

FT-IR
Liquid crystalline polymers (LCP)
Polyimides

ASJC Scopus subject areas

General Chemical Engineering
Materials Chemistry
Polymers and Plastics
Organic Chemistry

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10.1002/mame.200290027

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title = "Thermal imidization of the precursor of a liquid crystalline polyimide",

abstract = "Imidization of the precursor of a liquid crystalline polyimide was investigated using modulated differential scanning calorimetry (MDSC), Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and thermogravimetric analyzer (TGA) coupled to FTIR (TG-IR). The FTIR study revealed that the rate and degree of imidization are functions of curing temperature and time. Imidization proceeds in two stages under isothermal condition. The initial weight loss up to 250 °C as observed from TGA was due to thermal cyclization, i.e., imidization process. The XPS analysis shows that the poly(amic acid) has two nitrogen 1s species at 400.3 and 399.2 eV possibly due to the isomerism of the dianhydride carbonyl, while liquid crystalline polyimide shows only a single nitrogen 1s species at 400.8 eV due to imide species.",

keywords = "FT-IR, Liquid crystalline polymers (LCP), Polyimides",

author = "Pramoda, {Kumari P.} and Songlin Liu and Chung, {Tai Shung}",

year = "2002",

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doi = "10.1002/mame.200290027",

language = "English (US)",

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journal = "Macromolecular Materials and Engineering",

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publisher = "Wiley-VCH Verlag",

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TY - JOUR

T1 - Thermal imidization of the precursor of a liquid crystalline polyimide

AU - Pramoda, Kumari P.

AU - Liu, Songlin

AU - Chung, Tai Shung

PY - 2002/12/30

Y1 - 2002/12/30

N2 - Imidization of the precursor of a liquid crystalline polyimide was investigated using modulated differential scanning calorimetry (MDSC), Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and thermogravimetric analyzer (TGA) coupled to FTIR (TG-IR). The FTIR study revealed that the rate and degree of imidization are functions of curing temperature and time. Imidization proceeds in two stages under isothermal condition. The initial weight loss up to 250 °C as observed from TGA was due to thermal cyclization, i.e., imidization process. The XPS analysis shows that the poly(amic acid) has two nitrogen 1s species at 400.3 and 399.2 eV possibly due to the isomerism of the dianhydride carbonyl, while liquid crystalline polyimide shows only a single nitrogen 1s species at 400.8 eV due to imide species.

AB - Imidization of the precursor of a liquid crystalline polyimide was investigated using modulated differential scanning calorimetry (MDSC), Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and thermogravimetric analyzer (TGA) coupled to FTIR (TG-IR). The FTIR study revealed that the rate and degree of imidization are functions of curing temperature and time. Imidization proceeds in two stages under isothermal condition. The initial weight loss up to 250 °C as observed from TGA was due to thermal cyclization, i.e., imidization process. The XPS analysis shows that the poly(amic acid) has two nitrogen 1s species at 400.3 and 399.2 eV possibly due to the isomerism of the dianhydride carbonyl, while liquid crystalline polyimide shows only a single nitrogen 1s species at 400.8 eV due to imide species.

KW - FT-IR

KW - Liquid crystalline polymers (LCP)

KW - Polyimides

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DO - 10.1002/mame.200290027

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JO - Macromolecular Materials and Engineering

JF - Macromolecular Materials and Engineering

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ER -

Thermal imidization of the precursor of a liquid crystalline polyimide

Abstract

Keywords

ASJC Scopus subject areas

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