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Processing and Properties of Supercritical Co2 Foamed Poly (Vinyl Alcohol)
Subject area: Science,Engineering and Technology · Area of research: Polymer
Abstract
In this study, polyvinyl alcohol was acetalized with formaldehyde under acidic conditions and foamed with supercritical CO2 to obtained foam products. We then studied the effects of temperature, CO2 pressure and formaldehyde concentration on properties such as foam density, swelling ratio and open cell ratio. It was found that the density decreased with increasing temperature, increasing CO2 pressure, but increased with increasing formaldehyde concentration. The swelling ratio decreased as the formaldehyde concentration increased, which meant that an increase in formaldehyde concentration could effectively increase the degree of crosslinking. However, CO2 pressure and processing temperature have no effect on the swelling ratio. The foam products obtained were mostly closed-cell type. The resulting open cell ratios were very low regardless of foaming temperature, CO2 pressure or formaldehyde concentration.
Keywords
Crosslink, Foam, Polyvinyl Alcohol, Supercritical Carbon Dioxide
How to cite this paper
@article{1705846,
author = {Horng-Jer Tai, Ming-Yuan Cheng},
title = {Processing and Properties of Supercritical Co2 Foamed Poly (Vinyl Alcohol)},
journal = {Iconic Research And Engineering Journals},
year = {2024},
volume = {7},
number = {11},
pages = {473-476},
issn = {2456-8880},
url = {https://www.irejournals.com/formatedpaper/1705846.pdf},
abstract = {In this study, polyvinyl alcohol was acetalized with formaldehyde under acidic conditions and foamed with supercritical CO2 to obtained foam products. We then studied the effects of temperature, CO2 pressure and formaldehyde concentration on properties such as foam density, swelling ratio and open cell ratio. It was found that the density decreased with increasing temperature, increasing CO2 pressure, but increased with increasing formaldehyde concentration. The swelling ratio decreased as the formaldehyde concentration increased, which meant that an increase in formaldehyde concentration could effectively increase the degree of crosslinking. However, CO2 pressure and processing temperature have no effect on the swelling ratio. The foam products obtained were mostly closed-cell type. The resulting open cell ratios were very low regardless of foaming temperature, CO2 pressure or formaldehyde concentration.},
keywords = {Crosslink, Foam, Polyvinyl Alcohol, Supercritical Carbon Dioxide},
month = {May},
}