Synthesis of Biodegradable Polyurethane Foams from Condensed Tannin and Bark of Acacia mearnsii

戈 進杰, Jin-jie Ge, ゲ ジンジェ
{"title":"Synthesis of Biodegradable Polyurethane Foams from Condensed Tannin and Bark of Acacia mearnsii","authors":"戈 進杰, Jin-jie Ge, ゲ ジンジェ","doi":"10.11501/3084040","DOIUrl":null,"url":null,"abstract":"Utilization of wattle tannin (WT) and Acacia meamsii bark (BK) was studied as a partial replacement for synthetic polyols in formulation of polyurethane (PU) preparation. Based on the urethane formation from (+ )-catechin, it is suggested that polyhydric condensed tannin can be utilized as a polyol and constitutes hard segments in a PU polymer molecule. Rigid PU foams were prepared from WT and BK and their biodegradability was investigated. Various types of PU foams can be obtained by selecting the appropriate diisocyanates. Hydroxyl groups in B-ring of WT react with isocyanate, and hence WT and BK act as cross-linking agents as well as hard segments in PU foams so as to produce rigid foams at high levels of WT or BK contents. The PU foams derived from WT and BK obviously were degraded by some wood-rotting fungi. The BK moiety was degraded preferentially by fungi and soil microorganisms. The urethanes derived from catechin and WT were relatively stable under hydrolytic and aminolytic conditions at room temperature. The rates of decompo­ sition of urethanes derived from catechin and WT in both hydrolysis and aminolysis conditions at high temperatures were much faster than those of urethanes derived from phenethyl alcohol and trirnethylolpropane.","PeriodicalId":378300,"journal":{"name":"Bulletin of the Kyushu University Forests","volume":"79 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1998-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Bulletin of the Kyushu University Forests","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.11501/3084040","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 2

Abstract

Utilization of wattle tannin (WT) and Acacia meamsii bark (BK) was studied as a partial replacement for synthetic polyols in formulation of polyurethane (PU) preparation. Based on the urethane formation from (+ )-catechin, it is suggested that polyhydric condensed tannin can be utilized as a polyol and constitutes hard segments in a PU polymer molecule. Rigid PU foams were prepared from WT and BK and their biodegradability was investigated. Various types of PU foams can be obtained by selecting the appropriate diisocyanates. Hydroxyl groups in B-ring of WT react with isocyanate, and hence WT and BK act as cross-linking agents as well as hard segments in PU foams so as to produce rigid foams at high levels of WT or BK contents. The PU foams derived from WT and BK obviously were degraded by some wood-rotting fungi. The BK moiety was degraded preferentially by fungi and soil microorganisms. The urethanes derived from catechin and WT were relatively stable under hydrolytic and aminolytic conditions at room temperature. The rates of decompo­ sition of urethanes derived from catechin and WT in both hydrolysis and aminolysis conditions at high temperatures were much faster than those of urethanes derived from phenethyl alcohol and trirnethylolpropane.
缩合单宁与金合欢树皮合成可生物降解聚氨酯泡沫
研究了金合欢单宁(WT)和金合欢树皮(BK)在聚氨酯(PU)制备中的部分替代合成多元醇。基于(+)-儿茶素生成聚氨酯的研究表明,聚水缩合单宁可以作为多元醇并在PU聚合物分子中构成硬段。以WT和BK为原料制备了硬质聚氨酯泡沫塑料,并对其生物降解性进行了研究。通过选择合适的二异氰酸酯,可以得到各种类型的PU泡沫。WT的b环羟基与异氰酸酯反应,因此WT和BK在PU泡沫中充当交联剂和硬段,从而产生高WT或BK含量的刚性泡沫。由WT和BK制备的PU泡沫明显被一些腐木真菌降解。BK部分被真菌和土壤微生物优先降解。在室温水解和氨解条件下,由儿茶素和WT制备的聚氨酯相对稳定。在高温水解和氨解条件下,儿茶素和WT制得的聚氨酯的分解速率都比苯乙醇和三乙基丙烷制得的聚氨酯快得多。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
自引率
0.00%
发文量
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:604180095
Book学术官方微信