Synthesis of high molecular weight poly(L-lactic acid)s by direct polycondensation with organic acids as catalyst

Sung Yeon Hwang; Dongyeop X. Oh; Jeyoung Park

doi:10.4028/www.scientific.net/KEM.773.25

Synthesis of high molecular weight poly(L-lactic acid)s by direct polycondensation with organic acids as catalyst

Sung Yeon Hwang, Dongyeop X. Oh, Jeyoung Park

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

2 Citations (Scopus)

Abstract

In this study, high molecular weight (HMW) poly (L-lactic acid)s (PLLAs) were synthesized by direct polycondensation using organic acid catalysts alone in a nitrogen-controlled environment. The melting point and enthalpy of the pre-polymer produced by melt polycondensation increased as molecular weight grew during solid-state polycondensation. It was observed that the nitrogen-controlled external environment had lower molecular weight than air, but the low molecular weight tail was significantly reduced, as indicated by gel permeation chromatography. This is because it inhibited the reverse reaction by preventing the penetration of water inside the reactor. Also, the control of moisture improved the color of PLLA. The amount of organic acid catalyst used was 1 wt%, which was favorable for achieving HMW. Both p-toluenesulfonic acid and 4-ethylbenzenesulfonic acid are examples of organic acids that were able to produce HMW PLLA.

Original language	English
Title of host publication	Applied Engineering, Materials and Mechanics II
Editors	Jong Wan Hu
Publisher	Trans Tech Publications Ltd
Pages	25-29
Number of pages	5
ISBN (Print)	9783035713374
DOIs	https://doi.org/10.4028/www.scientific.net/KEM.773.25
Publication status	Published - 2018
Event	3rd International Conference on Applied Engineering, Materials and Mechanics, ICAEMM 2018 - Okinawa Island, Japan Duration: 20 Apr 2018 → 22 Apr 2018

Publication series

Name	Key Engineering Materials
Volume	773 KEM
ISSN (Print)	1013-9826
ISSN (Electronic)	1662-9795

Conference

Conference	3rd International Conference on Applied Engineering, Materials and Mechanics, ICAEMM 2018
Country/Territory	Japan
City	Okinawa Island
Period	20/04/18 → 22/04/18

Bibliographical note

Publisher Copyright:
© 2018 Trans Tech Publications, Switzerland.

Keywords

Direct polycondensation
Moisture control
Organic acid
PLLA
Poly(L-lactic acid)

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10.4028/www.scientific.net/KEM.773.25

Cite this

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title = "Synthesis of high molecular weight poly(L-lactic acid)s by direct polycondensation with organic acids as catalyst",

abstract = "In this study, high molecular weight (HMW) poly (L-lactic acid)s (PLLAs) were synthesized by direct polycondensation using organic acid catalysts alone in a nitrogen-controlled environment. The melting point and enthalpy of the pre-polymer produced by melt polycondensation increased as molecular weight grew during solid-state polycondensation. It was observed that the nitrogen-controlled external environment had lower molecular weight than air, but the low molecular weight tail was significantly reduced, as indicated by gel permeation chromatography. This is because it inhibited the reverse reaction by preventing the penetration of water inside the reactor. Also, the control of moisture improved the color of PLLA. The amount of organic acid catalyst used was 1 wt%, which was favorable for achieving HMW. Both p-toluenesulfonic acid and 4-ethylbenzenesulfonic acid are examples of organic acids that were able to produce HMW PLLA.",

keywords = "Direct polycondensation, Moisture control, Organic acid, PLLA, Poly(L-lactic acid)",

author = "Hwang, {Sung Yeon} and Oh, {Dongyeop X.} and Jeyoung Park",

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year = "2018",

doi = "10.4028/www.scientific.net/KEM.773.25",

language = "English",

isbn = "9783035713374",

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publisher = "Trans Tech Publications Ltd",

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}

Hwang, SY, Oh, DX & Park, J 2018, Synthesis of high molecular weight poly(L-lactic acid)s by direct polycondensation with organic acids as catalyst. in JW Hu (ed.), Applied Engineering, Materials and Mechanics II. Key Engineering Materials, vol. 773 KEM, Trans Tech Publications Ltd, pp. 25-29, 3rd International Conference on Applied Engineering, Materials and Mechanics, ICAEMM 2018, Okinawa Island, Japan, 20/04/18. https://doi.org/10.4028/www.scientific.net/KEM.773.25

Synthesis of high molecular weight poly(L-lactic acid)s by direct polycondensation with organic acids as catalyst. / Hwang, Sung Yeon; Oh, Dongyeop X.; Park, Jeyoung.
Applied Engineering, Materials and Mechanics II. ed. / Jong Wan Hu. Trans Tech Publications Ltd, 2018. p. 25-29 (Key Engineering Materials; Vol. 773 KEM).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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T1 - Synthesis of high molecular weight poly(L-lactic acid)s by direct polycondensation with organic acids as catalyst

AU - Hwang, Sung Yeon

AU - Oh, Dongyeop X.

AU - Park, Jeyoung

PY - 2018

Y1 - 2018

N2 - In this study, high molecular weight (HMW) poly (L-lactic acid)s (PLLAs) were synthesized by direct polycondensation using organic acid catalysts alone in a nitrogen-controlled environment. The melting point and enthalpy of the pre-polymer produced by melt polycondensation increased as molecular weight grew during solid-state polycondensation. It was observed that the nitrogen-controlled external environment had lower molecular weight than air, but the low molecular weight tail was significantly reduced, as indicated by gel permeation chromatography. This is because it inhibited the reverse reaction by preventing the penetration of water inside the reactor. Also, the control of moisture improved the color of PLLA. The amount of organic acid catalyst used was 1 wt%, which was favorable for achieving HMW. Both p-toluenesulfonic acid and 4-ethylbenzenesulfonic acid are examples of organic acids that were able to produce HMW PLLA.

AB - In this study, high molecular weight (HMW) poly (L-lactic acid)s (PLLAs) were synthesized by direct polycondensation using organic acid catalysts alone in a nitrogen-controlled environment. The melting point and enthalpy of the pre-polymer produced by melt polycondensation increased as molecular weight grew during solid-state polycondensation. It was observed that the nitrogen-controlled external environment had lower molecular weight than air, but the low molecular weight tail was significantly reduced, as indicated by gel permeation chromatography. This is because it inhibited the reverse reaction by preventing the penetration of water inside the reactor. Also, the control of moisture improved the color of PLLA. The amount of organic acid catalyst used was 1 wt%, which was favorable for achieving HMW. Both p-toluenesulfonic acid and 4-ethylbenzenesulfonic acid are examples of organic acids that were able to produce HMW PLLA.

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KW - Moisture control

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KW - Poly(L-lactic acid)

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BT - Applied Engineering, Materials and Mechanics II

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ER -

Synthesis of high molecular weight poly(L-lactic acid)s by direct polycondensation with organic acids as catalyst

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