The urethan linkage (-NHCOO-), which is a characteristic feature of polyurethane polymers, can be detected through the FTIR spectrum of variously composed polyurethane samples. ...

2022年10月19日 · 聚氨酯结构和组成分析中，红外光谱(IR) 分析技术是一种重要的分析方法，提供分子结构信息量多，准确性高。 异氰酸酯、多元醇、催化剂、 泡沫稳定剂、防老剂、扩链剂等有机化合物都有自已独特的红外吸 收光谱。 根据各基团的特征峰。 可推测聚氨酯中所含的成分。 2 红外光谱分析过程. 对聚氨酯及其原料进行IR谱图分析，首先可根据对样晶用途、性状等信息以及特征峰位置，初步判断样品的种类，如有条件，可查找标准光谱图，或与已知类似的样品请图 …

2009年8月27日 · Fourier Transformed Infrared Spectroscopy, Thermogravimetric Analysis, and X-ray Diffractometry have been used to investigate the rigid, semi rigid, and soft polyurethane (PU) forms, which were developed by the Group of Analytic Chemistry and Technology of Polymers - USP - São Carlos.

We present a composite elastic electrolyte based on polyurethane (PU) with high ionic conductivity of 10⁻³ S/cm and excellent mechanical properties (stress-strain) of 4.5 MPa by incorporating...

2023年6月23日 · Polyurethanes are widely made into foam rubber, elastic, and wood coatings, amongst other things. The spectra of polyurethanes are similar to polyamides since both polymer types contain C=O and N-H bonds. Therefore, we will begin with a …

Figure 1 shows the FTIR spectrum of pristine SMPU and PKO-p based SMPU. The absence of NCO peak at 2260 cm -1 and the presence of NH peak in the range of 3331 cm -1 to 3347 cm -1 indicates the...

本文介绍了将___变换红外光谱（ftir）应用于聚氨酯纤维的研究。 FTIR光谱通过分析官能团的红外特征吸收频率范围来表征聚合物的结构组成。 聚氨酯分子结构中的官能团比一般的聚合物复杂得多，除含有一NH—COO这一特征基团外，还会同时存在酯基、醚基、烃基 ...

FTIR光谱是通过官能团的红外特征吸收频率范围来表征聚合物的结构组成的合成PU的单体通常在3种以上，加上新品种的不断开发，PU分子结构中的官能团比一般的聚合物复杂得多，除含有一NH—COO这一特征基团外，还会同时存在酯基、醚基、烃基、芳香基、脲基、酰氨基等基团。 强度很大,它是鉴定NCO基最有效的特征峰。 2）1375-1395处的吸收峰归属于NCO对称伸缩振动，其强度比较弱，还长于CH峰混在一起，常无法辨认，所以其对于鉴定NCO的意义不大。 醚键区 …

2017年1月1日 · FTIR spectra of a polyurethane model compound. Nuclear magnetic resonance (NMR) spectroscopy is also an important tool to identify reactions during PU synthesis and the quantification of the hydrogen bonding interactions.

• The chemical composition of rigid polyurethane foams was studied using FTIR microscopy and diffuse re˜ectance Fourier transform spectroscopy (DRIFTS) FTIR. • Temperature gradients during the processing of rigid polyurethane (PU) foams leads to chemical gradients that might be observed across the radial and axial dimensions of the foam.