Special structures and thermal stabilities of polyurethanes derived from diol and triol having oxazolidone moieties

IF 2.702 Q1 Materials Science Journal of Polymer Science Part A: Polymer Chemistry Pub Date : 2023-07-05 DOI:10.1002/pol.20230187
Yoshiaki Yoshida, Yuki Yoshinaga, Takeshi Endo
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Abstract

We synthesized regular polyurethanes from the diol having oxazolidone structure (Diol-1) and the aliphatic diisocyanate by typical polyaddition. The results of the structural analysis suggested that the polyurethane having a cyclic urethane structure such as oxazolidone formed a rod-like structure, although the control polyurethane having a chain urethane structure formed a linear structure. The polyaddition of Diol-1 and aliphatic diisocyanate with triol having oxazolidone structure (Triol-1) as a crosslinker also proceeded successfully to achieve corresponding polyurethanes. However, the polyurethanes containing a molar ratio of Triol-1 less than or equal 50% were soluble in high polar organic solvents nevertheless those polyurethanes contained some trifunctional units in the polymer chain. On the other hand, the polyurethanes containing a molar ratio of Triol-1 more than 50% were insoluble in any organic solvents. We hypothesized that the soluble polyurethanes containing Triol-1 formed multi-branched structure and the insoluble polyurethanes formed cross-linking structure. Such structures of polymer chain affected significantly to the thermal properties of the obtained polyurethanes.

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由具有恶唑酮部分的二醇和三醇衍生的聚氨酯的特殊结构和热稳定性
以具有恶唑酮结构的二醇(diol-1)和脂肪族二异氰酸酯为原料,通过典型的加成反应合成了规则聚氨酯。结构分析的结果表明,具有环状氨基甲酸酯结构如恶唑酮的聚氨酯形成杆状结构,尽管具有链氨基甲酸酯的对照聚氨酯形成线性结构。以具有恶唑酮结构的三醇(triol-1)作为交联剂的二ol-1和脂肪族二异氰酸酯的加聚也成功地进行,以获得相应的聚氨酯。然而,含有Triol-1摩尔比小于或等于50%的聚氨酯可溶于高极性有机溶剂,然而这些聚氨酯在聚合物链中含有一些三官能单元。另一方面,Triol-1摩尔比大于50%的聚氨酯不溶于任何有机溶剂。我们假设含有Triol-1的可溶性聚氨酯形成多支化结构,而不溶性聚氨酯形成交联结构。聚合物链的这种结构显著影响所获得的聚氨酯的热性能。
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来源期刊
CiteScore
5.20
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0.00%
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0
审稿时长
1.8 months
期刊介绍: Part A: Polymer Chemistry is devoted to studies in fundamental organic polymer chemistry and physical organic chemistry. This includes all related topics (such as organic, bioorganic, bioinorganic and biological chemistry of monomers, polymers, oligomers and model compounds, inorganic and organometallic chemistry for catalysts, mechanistic studies, supramolecular chemistry aspects relevant to polymer...
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Issue Information - Cover Description Cover Image, Volume 61, Issue 20 Issue Information - Cover Description Cover Image, Volume 61, Issue 19 Emerging researchers interview—Ji Liu, Southern University of Science and Technology
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