Alkaline hydrolysis of polymers with ester groups studied by isothermal calorimetry
(2013) In Polymer Degradation and Stability 98(1). p.73-78- Abstract
- Alkaline hydrolysis of polymers produces heat that can be measured with isothermal calorimetry to monitor the hydrolysis. We here report on two studies to measure the enthalpy of alkaline hydrolysis of polymers containing esters of carboxylic acids. The heat from the hydrolysis of films of poly(vinyl acetate), PVAc, was followed for up to 42 days and correlated with the amounts of acetic acid produced. The enthalpy per hydrolysed repeat unit was -57.3 kJ mol(-1) for PVAc. For poly(lactic acid), PLA, fibres the enthalpy of hydrolysis was determined by integrating the heat produced during complete hydrolysis. For PLA, the result per hydrolysed repeat unit was 57.9 kJ mol(-1). The determined values are within a few percent of the enthalpy of... (More)
- Alkaline hydrolysis of polymers produces heat that can be measured with isothermal calorimetry to monitor the hydrolysis. We here report on two studies to measure the enthalpy of alkaline hydrolysis of polymers containing esters of carboxylic acids. The heat from the hydrolysis of films of poly(vinyl acetate), PVAc, was followed for up to 42 days and correlated with the amounts of acetic acid produced. The enthalpy per hydrolysed repeat unit was -57.3 kJ mol(-1) for PVAc. For poly(lactic acid), PLA, fibres the enthalpy of hydrolysis was determined by integrating the heat produced during complete hydrolysis. For PLA, the result per hydrolysed repeat unit was 57.9 kJ mol(-1). The determined values are within a few percent of the enthalpy of neutralization of the carboxylic acids formed, as the hydrolysis itself has a low enthalpy; it is the neutralization of the acid that produces most of the measured heat. Isothermal calorimetry is thus a general quantitative method for the investigation of the rate and extent of alkaline hydrolysis of esters of carboxylic acids in polymers and other organic substances. (C) 2012 Elsevier Ltd. All rights reserved. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/3674805
- author
- Wadsö, Lars LU and Karlsson, Ola LU
- organization
- publishing date
- 2013
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Alkaline hydrolysis, Poly(vinyl acetate), Poly(lactic acid), Isothermal, calorimetry, Microcalorimetry, Degradation kinetics
- in
- Polymer Degradation and Stability
- volume
- 98
- issue
- 1
- pages
- 73 - 78
- publisher
- Elsevier
- external identifiers
-
- wos:000315171000009
- scopus:84871921524
- ISSN
- 1873-2321
- DOI
- 10.1016/j.polymdegradstab.2012.10.031
- language
- English
- LU publication?
- yes
- id
- 909b77e1-0688-44e9-bb33-d804239560c6 (old id 3674805)
- date added to LUP
- 2016-04-01 14:31:36
- date last changed
- 2022-01-28 01:02:58
@article{909b77e1-0688-44e9-bb33-d804239560c6,
abstract = {{Alkaline hydrolysis of polymers produces heat that can be measured with isothermal calorimetry to monitor the hydrolysis. We here report on two studies to measure the enthalpy of alkaline hydrolysis of polymers containing esters of carboxylic acids. The heat from the hydrolysis of films of poly(vinyl acetate), PVAc, was followed for up to 42 days and correlated with the amounts of acetic acid produced. The enthalpy per hydrolysed repeat unit was -57.3 kJ mol(-1) for PVAc. For poly(lactic acid), PLA, fibres the enthalpy of hydrolysis was determined by integrating the heat produced during complete hydrolysis. For PLA, the result per hydrolysed repeat unit was 57.9 kJ mol(-1). The determined values are within a few percent of the enthalpy of neutralization of the carboxylic acids formed, as the hydrolysis itself has a low enthalpy; it is the neutralization of the acid that produces most of the measured heat. Isothermal calorimetry is thus a general quantitative method for the investigation of the rate and extent of alkaline hydrolysis of esters of carboxylic acids in polymers and other organic substances. (C) 2012 Elsevier Ltd. All rights reserved.}},
author = {{Wadsö, Lars and Karlsson, Ola}},
issn = {{1873-2321}},
keywords = {{Alkaline hydrolysis; Poly(vinyl acetate); Poly(lactic acid); Isothermal; calorimetry; Microcalorimetry; Degradation kinetics}},
language = {{eng}},
number = {{1}},
pages = {{73--78}},
publisher = {{Elsevier}},
series = {{Polymer Degradation and Stability}},
title = {{Alkaline hydrolysis of polymers with ester groups studied by isothermal calorimetry}},
url = {{http://dx.doi.org/10.1016/j.polymdegradstab.2012.10.031}},
doi = {{10.1016/j.polymdegradstab.2012.10.031}},
volume = {{98}},
year = {{2013}},
}