Biodegradability and Thermostability of Renewable Waterborne Polyurethane Synthesized from Trihydroxyl poly(L-malic acid)/glycol Based Polyols and Polycaprolactone Diol

IF 5.4 3区材料科学 Q2 CHEMISTRY, PHYSICAL

ACS Applied Energy Materials Pub Date : 2023-09-27 DOI:10.1007/s10924-023-03062-y

Mingxuan Yu, Xin Song, Haibin Niu, Chao Zhou, Li Liu, Guangfeng Wu

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Abstract

A biodegradable composite polyester-based waterborne polyurethane (L-AWPU) was synthesized by coupling L-malic acid with polyethylene glycol, resulting in poly (L-malic acid ethylene glycol ester, PL-A), with polycaprolactone (PCL) being used as a raw material. The primary objective of this research was to enhance biodegradability while maintaining thermal stability and mechanical properties. To achieve this, the content of PL-A in the polymer system was meticulously controlled, leading to the formulation of L-AWPU with outstanding biodegradability and thermal stability. Compared to the traditional PCL-WPU, the incorporation of PL-A not only introduced naturally degradable bio-based molecular chains into WPU but also increased the branching degree of the polyurethane molecular chains. This was attributed to the trifunctional hydroxyl group present in malic acid, which formed intramolecular cross-linking structures. When the PL-A content reached 20 mol%, the temperature of thermal weight loss (T5%) and maximum weight loss rate (T_max) of the polyurethane coating rose from 237.93 to 259.91 °C to 333.86 and 343.13 °C, respectively. This indicated that the establishment of intramolecular cross-linking structures and the increase in molecular weight had effectively enhanced the thermal stability of the polyurethane. At a PL-A content of 20 mol%, there was no significant decrease in the tensile strength and elongation at break of L-AWPU when compared to PCL-WPU.

Graphical Abstract

Abstract Image

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由三羟基聚（L-苹果酸）/乙二醇基多元醇和聚己内酯二元醇合成的可再生水性聚氨酯的生物降解性和热稳定性

通过将 L-苹果酸与聚乙二醇偶联，合成了聚（L-苹果酸乙二醇酯，PL-A），并以聚己内酯（PCL）为原料，合成了一种可生物降解的复合聚酯基水性聚氨酯（L-AWPU）。这项研究的主要目的是在保持热稳定性和机械性能的同时，提高生物降解性。为此，我们对聚合物体系中 PL-A 的含量进行了严格控制，最终配制出具有出色生物降解性和热稳定性的 L-AWPU。与传统的 PCL-WPU 相比，PL-A 的加入不仅在 WPU 中引入了可自然降解的生物基分子链，还增加了聚氨酯分子链的支化度。这要归功于苹果酸中存在的三官能团羟基，它形成了分子内交联结构。当 PL-A 含量达到 20 mol% 时，聚氨酯涂层的热失重温度（T5%）和最大失重率（Tmax）分别从 237.93 ℃ 至 259.91 ℃ 升至 333.86 ℃ 和 343.13 ℃。这表明分子内交联结构的建立和分子量的增加有效提高了聚氨酯的热稳定性。当 PL-A 含量为 20 mol% 时，L-AWPU 的拉伸强度和断裂伸长率与 PCL-WPU 相比没有显著下降。

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来源期刊

ACS Applied Energy Materials Materials Science-Materials Chemistry

CiteScore

10.30

自引率

6.20%

发文量

1368

期刊介绍： ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.