FTIR and XPS study of the reaction of phenyl isocyanate and cellulose with different moisture contents
FTIR and XPS study of the reaction of phenyl isocyanate and cellulose with different moisture contents
复制标题
不同含水量下异氰酸苯酯与纤维素反应的 FTIR 和 XPS 研究
DOI：
10.1108/03699420510620300
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发表时间：
2005-01-01
影响因子：
1.4
通讯作者：
Bai, XD
中科院分区：
文献类型：
--
作者：
Gao, ZH;Gu, JY;Bai, XD
目的 - 评估异氰酸酯与纤维素和水的竞争反应，为异氰酸酯与木材的粘合和固化反应的进一步研究提供方向。 设计/方法/途径 - 使用两种现代分析技术，傅里叶变换红外（FTIR）和X射线光电子能谱（XPS）。 FTIR用于鉴定异氰酸苯酯(PI)与醇、水和纤维素的反应产物；研究结果 - 建立了 PI 与正丙醇、水和纤维素反应结果的红外鉴定方法，其中 PI 与水和 PI 与纤维素反应分别生成 N,N'-二苯基脲和氨基甲酸酯。结果发现，随着纤维素MC的增加，异氰酸酯与纤维素的反应程度降低，当MC达到9.78％时，92.98％的异氰酸酯与水反应。已证实PI反应的产物主要分布在纤维素颗粒的表面。研究局限性/意义 - 该研究仅关注PI的反应。然而，工业异氰酸酯，例如异氰酸酯。亚甲基二苯基二异氰酸酯 (MDI)、聚合亚甲基二苯基二异氰酸酯 (p-MDI) 的化学结构和成分复杂，无法使用 FTIR 和 XPS 进行分析。 实际意义 - 本文提供了一些有关异氰酸酯反应的指导性信息，有助于了解异氰酸酯的特性，指导异氰酸酯与纤维、木材等粘合技术的设计。 原创性/价值 - FTIR 和 XPS 的应用评估异氰酸酯与具有不同MC的纤维素的反应是新颖的，可以作为其他相关研究的参考。
Purpose - To evaluate the competing reaction of isocyanate with cellulose and water which can provide direction for further studies on bonding and curing reactions of isocyanate with wood.Design/methodology/approach - Two modern analytical techniques, Fourier transform infra-red (FTIR) and X-ray photoelectron spectroscopy (XPS), were used. The FTIR was used to identify the products of the reaction of phenyl isocyanate (PI) with alcohol, water, and cellulose; while the XPS was used to evaluate the proportions of isocyanate that reacted with water or cellulose when PI reacted with cellulose at different moisture contents (MCs), respectively.Findings - Methods for the IR identifications of reaction results of PI with n-propanol, water, and cellulose, in which the reactions of PI with water and PI with cellulose resulted in N,N'-diphenylurea and carbamate, respectively, were developed. It was discovered that the extent of reaction of isocyanate and cellulose decreased with increasing cellulose MC, and 92.98 per cent isocyanate reacted with water when 9.78 per cent MC was reached. It was confirmed that the products of the PI reaction were distributed mainly on the surface of the cellulose particles.Research limitations/implications - The study only focused on the reaction of PI. However, the industrial isocyanates, e.g. methylene diphenyl diisocyanate (MDI), polymerized methylene diphenyl diisocyanate (p-MDI) that have complexities in chemical structures and components, make analyses with FTIR and XPS impossible.Practical implications - The paper provides some instructive information about the isocyanate reaction that will help understanding the characteristics of isocyanate and guiding the design of technology bonding isocyanate to fibre, wood, etc.Originality/value - The application of FTIR and XPS for evaluating the reaction of isocyanate with cellulose having different MCs was novel and may be used as a reference for other relevant studies.