Description of Manufacture of a Chemisorption Fibre from Polycaproamide Graft Copolymers

A study of the kinetics of hydrazidation of PCA—PGMA graft copolymers showed that the reaction takes place with a high rate and practically ends in 10-15 min. Equations with the corresponding coefficients were obtained for describing the kinetics of the macromolecular reaction of hydrazidation of the graft polymer based on a mathematical model for solving a diffusion equation with a boundary condition in the form of flow. This approach can be used for creating principles for regulation of processes in chemical engineering of polymer systems.     

Thermooxidation of Modified Polycaproamide Fibre Containing Graft Poly(Dimethylaminoethyl Methacrylate)

The effectiveness of the polymer modifier poly(dimethylaminoethyl methacrylate) (PDMAEMA) in cross-linking and carbonization of polycaproamide fibre was demonstrated. The optimum composition of the PCA—PDMAEMA graft copolymer was determined and the conditions of conducting thermooxidation (temperature, time) to decrease the thermoplasticity of modified PCA were found.     

疏水化水溶性两性纤维素接枝共聚物CGAO的合成及其水溶液的粘度性能

通过丙烯酰胺（AM）及甲基丙烯酰氧乙基二甲基辛基溴化铵（ADMOAB）与羧甲基纤维素钠（Na－CMC）进行接枝共聚制备了疏水化水溶性两性纤维素接权共聚物（CGAO）。用红外光谱与元素分析对CGAO的组成进行了分析。考察了CGAO的组成、浓度及无机盐对其水溶液粘度行为的影响。发现组成对粘度有直接的影响;水溶液粘度随共聚物的浓度增加而增大存在一临界聚合物浓度（cp）,cp与其组成紧密相关;在低的无机盐浓度时,溶液的粘度随无机盐浓度增加而降低,进一步增加无机盐浓度时,溶液粘度随无机盐浓度增加而提高,显示出了这种疏水化水溶性两性聚电解质特有的耐盐增粘性能。     

Effect of Chromium Compounds on Thermochemical Transformations of Graft Copolymers of Polycaproamide and Poly(Dimethylaminoethyl Methacrylate)

IR spectroscopy and differential thermal and thermogravimetric analysis showed that impregnation of PCA fibre modified by grafting poly(dimethylaminoethyl methacrylate) (PDMAEMA) and chromium-containing compounds causes loss of thermoplasticity, accumulation of double bonds, a decrease in the maximum rate of decomposition, and an increase in coke residue. It was found that the yield of the final product increases in fabrication of carbon fibre from graft PCA—PDMAEMA copolymers in the presence of Cr(NO₃)₃ + (NH₄)₂HPO₄. The carbon fibre containing chromium salts has a more developed pore structure than the initial fibre, as the almost ten-fold increase in the value of sorption of I₂ indicates.     

Fibre Chemisorbents for Treatment of Industrial Sewage

An industrial method was developed for treatment of electroplating plant sewage to remove heavy metal ions [zinc, chromium (VI)] with chemisorption materials. The high efficiency of removal of toxic contaminants from aqueous medium with fibre sorbents is demonstrated.     

Fabrication of Polycaproamide Chemisorption Fibre with Hydrazide Groups

The possibility of the reaction of hydrazidation of polymeric oxiranes in graft copolymers was demonstrated. Polycaproamide chemisorption fibre with a static exchange capacity for HCl of 2.5-3.0 mmole/g was fabricated.     

Synthesis of New Derivatives of Polycaproamide Graft Copolymers Containing 2-(4-Aminophenyl)Quinoline-4-Carboxylic Acid Fragments

2-(4-Aminophenyl)quinoline-4-carboxylic acid, an internal salt, was synthesized from isatin and 4-aminoacetophenone with the Pfitzinger reaction. The data from IR spectroscopy and chemical methods of analysis showed that new derivatives of PCA-PGMA graft copolymer not described previously are formed during polymer-analog transformations of PCA-PGMA graft copolymer under the effect of 2-(4-aminophenyl)quinoline-4-carboxylic acid.     

Effect of Ethyl Alcohol Vapors on the Structure of Polycaproamide Fibre

It was found that ethyl alcohol vapors induce a spontaneous elongation effect in PCA fibres. Modification of PCA fibres with ethyl alcohol vapors makes the structure pass from the unstable -modification to the stable -modification, eliminating the process of repeated orientational drawing.     

Synthesis of Grafted Copolymers of Polycaproamide with Preheating of the Monomer

Fibre Chemistry - Chemical modification of polymers via synthesis of grafted copolymers and other methods is one strategy for producing polymers with predetermined properties. The design of an...     

纤维素接枝共聚研究

本文论述了天然纤维素纤维的生产方法包括铜氨溶液、NMMO及LiCl/极性溶剂等对生态环境和纤维性能的影响 ,重点介绍了纤维素在LiCl/极性溶剂体系中溶解机理及各种溶解条件对溶解性能的影响。对纤维素接枝共聚及其产物也作了相应介绍。     

纤维素接枝反应的研究进展

纤维素是世界上最丰富的天然可再生资源。离子液体是一种新型的绿色溶剂,在纤维素的均相接枝研究中正起着越来越重要的作用。文章介绍了纤维素接枝反应尤其是均相接枝反应的研究进展。     

聚硅氧烷接枝共聚物

本文介绍了一些聚硅氧烷的接枝共聚物。它们的合成与普通聚合物类似，接枝共聚技术可用于橡胶、塑料及无机材料的改性，经改性后聚合物溶合了两者的性能，其应用领域进一步扩展。     

Effect of Aging of Polycaproamide Crumb on the Quality of Vidlon Textile Fibre

In storage in the hoppers of spinning machines in nitrogen medium with a regulated oxygen content, oxidative processes inevitably take place in PCA crumb and significantly change the properties of the fibres. Spinning of fibres from PCA crumb stored for different times is an additional cause of their nonuniform properties. Installation of an additional smaller hopper with a day's reserve of polymer under the machine's hopper improves the quality of the fibres obtained.     

变性淀粉—丙烯酰胺接枝共聚物的制备及其对瓦楞纸的增强作用

以硝酸铈为引发剂，合成了氧化淀粉及可溶性淀粉等变性淀粉与丙烯酰胺的接枝共聚物，详细考察了引发剂用量及淀粉性质对单体转化率和接枝率的影响。结果发现，用氧化淀粉，可溶性淀粉等变性淀粉与丙烯酰胺接枝共聚，可获得比原淀粉高得多的单体转化率和接枝率。在瓦楞纸中的使用表明，添加０．５％的氧化淀粉一丙烯酰胺接枝共聚物可使瓦楞纸的环压强度增加５２％。     

Grafting of Maleic Anhydride Copolymers onto Cellulose Acetate and Methyl Cellulose

A high level of control over grafting reactions onto cellulose derivatives was achieved by an acyl transfer reaction mechanism. Ethylene/maleic anhydride copolymer (EMA) and styrene/maleic anhydride copolymer (SMA) were grafted onto cellulose acetate (CA) and methyl cellulose (MC) in a simple and effective way under homogeneous reaction conditions. While pyridine, a commonly used catalyst for the reaction of an anhydride with an alcohol to form an ester, gave an inconveniently long reaction time, N-methylimidazole (NMID) and 4-(N,N-dimethylamino)pyridine (DMAP) were found to increase greatly the rate of esterification.     

The Importance of Long-Term Observations in Assessing the Strength of Polycaproamide Fibre

According to long-term observations, rewinding and slubbing operations have almost no effect on the unit strength of complex and slubbed polycaproamide fibres but affect the relative elongation at break. The stability of the deformation-strength properties of the fibres in time, assessed with the values of the coefficients of variation, during the manufacturing process, including slubbing, improves significantly. The fibre strength is not a function of fluctuations in the content of low-molecular-weight compounds in the initial polymer and its relative viscosity, spinning temperature, and elementary fibre thickness in the undrawn fibre in contrast to the moisture content of polymer going to spinning and the degree of orientational drawing of the fibre.     

醋酯纤维的纺前着色

该文介绍了醋酯纤维的纺前着色方法、着色剂及着色工艺,并以着色剂Dymicro PAC为例,介绍了着色工艺,各项性能,部分色谱用量。．     

壳聚糖接枝共聚物的应用研究

以壳聚糖与甲基丙烯酸接枝共聚物为载体,采用直接压片法制得药物非诺落芬钙的缓释片剂.测定了缓释片剂中的非诺落芬钙的体外溶出速率,用红外光谱(FT-IR)表征了缓释片剂中非诺落芬钙与接枝共聚物形成的分子间氢键.     

辐射接枝SBS的性能研究

采用旋转流变仪研究了苯乙烯-丁二烯-苯乙烯（sgs）嵌段聚合物接枝α-甲基丙烯酸（MAA）、甲基丙烯酸甲酯（MMA）接枝共聚物（SBS-g-MAA，SBS-g-MMA）的动态流变性能。结果表明：接枝共聚物的黏流活化能降低，温度敏感性降低；比较改性前后的共聚物的主曲线，接枝共聚物的相对分子质量分布变宽，在剪切应力作用下，黏度下降较快；接枝共聚物的相对分子质量分布变宽，接枝共聚物的抗氧化性增强。