Green based composite polyurethane coatings for steel

IF 2.4 3区 化学 Q3 POLYMER SCIENCE Iranian Polymer Journal Pub Date : 2024-06-08 DOI:10.1007/s13726-024-01341-6
Dmitry S. Konovalov, Natalia N. Saprykina, Vjacheslav V. Zuev
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Abstract

The polyurethane composites based on vegetable source were prepared and their properties were investigated. Castor oil was used as polyol and diatomite and birch flour were used as fillers. The introduction of diatomite led to development of ordered quasi-lamellar morphology of polyurethane matrix. This effect in combination with loading of birch flour with fiber structure allowed to obtain polymer composites with improved tensile strength (up to 14 MPa, an increase on five times in comparison with the neat polyurethane). The glass-transition temperatures of polymer composites increased more than 40 °C relative to the neat polymer. Adhesion to steel increased more than in five times in comparison with the neat polyurethane for composite containing 20 wt% diatomite additives). The SEM and FTIR spectroscopy techniques were used to evaluate the microphase structure of the polyurethane composites. SEM micrographs showed that the diatomite particles served as nucleation centers for formation of lamellar-like structure of PU matrix. At the optimal loading (20 wt%) the almost uniform lamellar-like structure of PU matrix was formed, that provided the best mechanical performance of PU composites. However, as FTIR study showed, formation of lamellar-like structure of PU matrix did not induce its inner microphase transformation. The presence of wood fibers in composites, despite their better mechanical performance, led to the decrease of their adhesion to steel.

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用于钢材的绿色复合聚氨酯涂料
制备了基于植物来源的聚氨酯复合材料,并对其性能进行了研究。蓖麻油用作多元醇,硅藻土和桦树粉用作填料。硅藻土的引入使聚氨酯基质形成了有序的准胶束状形态。这种效应与纤维结构中的桦树粉负载相结合,使聚合物复合材料的拉伸强度得到提高(高达 14 兆帕,与纯聚氨酯相比提高了五倍)。与纯聚合物相比,聚合物复合材料的玻璃转化温度提高了 40 °C。与纯聚氨酯相比,含有 20 wt%硅藻土添加剂的复合材料对钢材的粘附力增加了五倍以上。)扫描电镜和傅立叶变换红外光谱技术用于评估聚氨酯复合材料的微相结构。扫描电镜显微照片显示,硅藻土颗粒是聚氨酯基质形成片状结构的成核中心。在最佳添加量(20 wt%)下,聚氨酯基体形成了几乎均匀的片状结构,从而使聚氨酯复合材料具有最佳的机械性能。然而,傅立叶变换红外光谱研究表明,聚氨酯基质片状结构的形成并没有引起其内部微相的转变。尽管复合材料具有更好的机械性能,但复合材料中木纤维的存在导致其与钢的粘附力下降。
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来源期刊
Iranian Polymer Journal
Iranian Polymer Journal 化学-高分子科学
CiteScore
4.90
自引率
9.70%
发文量
107
审稿时长
2.8 months
期刊介绍: Iranian Polymer Journal, a monthly peer-reviewed international journal, provides a continuous forum for the dissemination of the original research and latest advances made in science and technology of polymers, covering diverse areas of polymer synthesis, characterization, polymer physics, rubber, plastics and composites, processing and engineering, biopolymers, drug delivery systems and natural polymers to meet specific applications. Also contributions from nano-related fields are regarded especially important for its versatility in modern scientific development.
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