Lu Yongshang, Larock Richard C
Department of Chemistry, Iowa State University, Ames, Iowa 50011, USA.
Biomacromolecules. 2008 Nov;9(11):3332-40. doi: 10.1021/bm801030g. Epub 2008 Oct 21.
The environmentally friendly vegetable-oil-based waterborne polyurethane dispersions with very promising properties have been successfully synthesized without difficulty from a series of methoxylated soybean oil polyols (MSOLs) with different hydroxyl functionalities ranging from 2.4 to as high as 4.0. The resulting soybean-oil-based waterborne polyurethane (SPU) dispersions exhibit a uniform particle size, which increases from about 12 to 130 nm diameter with an increase in the OH functionality of the MSOL from 2.4 to 4.0 and decreases with increasing content of the hard segments. The structure and thermophysical and mechanical properties of the resulting SPU films, which contain 50-60 wt % MSOL as renewable resources, have been studied by Fourier transform infrared spectroscopy, differential scanning calorimetry, dynamic mechanical analysis, thermogravimetric analysis, transmission electron microscopy, and mechanical testing. The experimental results reveal that the functionality of the MSOLs and the hard segment content play a key role in controlling the structure and the thermophysical and mechanical properties of the SPU films. These novel films exhibit tensile stress-strain behavior ranging from elastomeric polymers to rigid plastics and possess Young's moduli ranging from 8 to 720 MPa, ultimate tensile strengths ranging from 4.2 to 21.5 MPa, and percent elongation at break values ranging from 16 to 280%. This work has addressed concerns regarding gelation and higher cross-linking caused by the high functionality of vegetable-oil-based polyols. This article reports novel environmentally friendly biobased SPU materials with promising applications as decorative and protective coatings.
已经成功地从一系列羟值范围为2.4至高达4.0的甲氧基化大豆油多元醇（MSOL）中顺利合成出具有非常优异性能的环保型植物油基水性聚氨酯分散体。所得的大豆油基水性聚氨酯（SPU）分散体呈现出均匀的粒径，随着MSOL的羟值从2.4增加到4.0，粒径从约12nm增加到130nm，并且随着硬段含量的增加而减小。通过傅里叶变换红外光谱、差示扫描量热法、动态力学分析、热重分析、透射电子显微镜和力学测试研究了所得含有50-60wt％MSOL作为可再生资源的SPU薄膜的结构、热物理和力学性能。实验结果表明，MSOL的官能度和硬段含量在控制SPU薄膜的结构、热物理和力学性能方面起着关键作用。这些新型薄膜表现出从弹性体聚合物到刚性塑料的拉伸应力-应变行为，杨氏模量范围为8至720MPa，极限拉伸强度范围为4.2至21.5MPa，断裂伸长率范围为16至280％。这项工作解决了关于植物油基多元醇高官能度引起的凝胶化和更高交联的问题。本文报道了具有作为装饰和保护涂层的潜在应用的新型环保型生物基SPU材料。
