Some biophysical properties of castor oil esterified with some acid anhydrides
Some biophysical properties of castor oil esterified with some acid anhydrides
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DOI：
10.1002/ejlt.200800001
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发表时间：
2008-10-01
影响因子：
2.7
通讯作者：
Nour, Kamal N. Abdell
中科院分区：
文献类型：
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作者：
Saied, Mona A.;Mansour, Sarnia H.;Nour, Kamal N. Abdell
以蓖麻油为原料，分别与邻苯二甲酸酐、马来酸酐和丁二酸酐进行酯化反应，合成了一系列蓖麻油加合物。用红外光谱和核磁共振氢谱对蓖麻油及其加合物的结构进行了表征。通过凝胶渗透色谱法测量数均和重均分子量。通过介电常数、介电损耗和电导率测量研究了其电性能，认为其处于电绝缘范围内。电导率，它描述了系统的离子迁移率，被发现是在10（-9）至10（-12）S/cm的范围内。这表明蓖麻油及其酯可用于抗静电应用。粘度η和活化能E-eta，从粘度对温度的依赖性，使用Arrhenius方程得到，被认为是随着增加的分子量的系统。研究了不同浓度蓖麻油及其酯类对甜菜病原菌R. solani和S.通过测定种子萌发率、菌丝平均伸长长度等指标，对罗尔夫氏菌进行了研究。干物质产量和菌核的产生。所获得的数据表明，蓖麻油与酸酐的酯化提高了抗真菌活性。
A series of castor oil adducts were synthesized by esterification of castor oil with acid anhydrides: phthalic, maleic and succinic anhydrides. The chemical structure of castor oil and the prepared adducts were characterized by means of IR and H-1 NMR spectroscopy. The number-average and weight-average molecular weights were measured by gel permeation chromatography. The electrical properties were studied through the permittivity, dielectric loss and conductivity measurements, which are considered to be in the range of electrical insulation. The electrical conductivity, which describes the ionic mobility of the systems, was found to be in the range of 10(-9) to 10(-12) S/cm. This indicates that castor oil and its esters could be used for antistatic applications. The viscosity eta and the activation energy E-eta, obtained from the dependency of viscosity on temperature using the Arrhenius equation, were found to increase with increasing Molecular weight of the system. The effect of different concentrations of castor oil and its esters oil the growth activities of the sugar beet pathogens R. solani and S. rolfsii was studied through the determination of percent germination, average length of hyphal extensions. dry mass yield and the production of sclerotia. The obtained data indicate that the esterification of castor oil with anhydrides improves the antifungal activity.