高氯酸为催化剂乙酰化法测定伯醇或仲醇

提出了以主氯酸为催化剂，分析纯乙酸乙酯为介质，乙酸化法测定伯、仲醇的实验条件，实现了对经典方法的改进，简化了操作程序。     

酰胺扩链剂对聚脲扩链反应动力学的影响

采用红外光谱(FT-IR)技术研究了新型位阻型酰胺扩链剂二乙酰乙二胺(MEDA)和二乙酰己二胺(MHAD)与4,4′-二苯甲烷二异氰酸酯(MDI)的扩链反应。考察了酰胺扩链剂对聚脲凝胶时间的影响,得出酰胺扩链剂能大大延长聚脲的凝胶时间,有利于反应动力学分析。扩链反应动力学研究结果表明,脂肪族酰胺扩链剂合成聚脲的扩链反应中,在反应初期低转化率时,反应均遵循二级动力学关系,得出MEDA和MHAD合成聚脲反应的活化能Ea分别为36.81 kJ/mol和43.99kJ/mol;MEDA反应活性高于MHAD.     

Synthesis and characterization of the new cellulose derivative films based on the hydroxyethyl cellulose prepared from “Stipa Tenacissima” cellulose of Eastern Morocco. I. Solubility study

Hydroxyethyl cellulose Acetate (HECA) was prepared starting from hydroxyethyl cellulose (HEC), acetic anhydride and perchloric acid which was used as catalyst. The synthesized product was characterized by FTIR, ¹³C NMR, and ¹H NMR. Substitution degree (DS) of HECA was determined using FTIR spectra taking a classical titration method as reference. The ¹H NMR spectroscopy was also used to confirm the results obtained by FTIR. The DS is substantially affected by the temperature, the time of reaction and especially the equivalent number (eq. nb.) of the acetic anhydride added. We have studied and discussed in the context of usage in modification reactions, the solubility of the HECA samples by varying their DS. This investigation was based on the determination of the Flory‐Huggins interaction parameters (χ_SP) using the partial Hansen solubility parameters (HSP). HSP of HEC and the HECA samples were calculated from the Van‐Krevlen‐Hoftyze (VKH) method and the T. Lindvig approximation. We have focused our work on predicting and controlling family solvents of HECA with various DS, to facilitate and to optimize the homogenous modification reaction conditions. From results on a range of HECA samples, it is conclude that their prediction solubility taking the value of DS into account is possible, and then the surface modification can relatively be easily realized. The thermal analysis study shows some differences in T_g and thermal degradation between HEC and HECA, moreover these thermal temperatures are influenced by DS values. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

大豆磷脂改性的研究

本课题主要研究了大豆磷脂的酰化改性。选用适宜的酰化剂与磷脂反应，使脑磷脂游离胺基接上酰基，并加碱性试剂中和，以降低产品酸价。酰化改性后的磷脂乳化性能较原料磷脂有显著提高，其质量指标完全符合同类产品要求。     

乙酰化改性亚麻二粗纤维的研究

探讨对亚麻二粗纤维进行乙酰化改性的工艺,通过乙酰化改性对亚麻二粗纤维物理机械性能产生影响,从而提高了亚麻纤维的性能和可纺性指标,以适应高支和满足生产高档亚麻针织物的要求。     

亚麻纤维乙酰化改性工艺研究

文章根据纤维素纤维的特点对亚麻纤维进行乙酰化改性,在保持纤维原有特点的基础上使亚麻纤维的微观结构发生变化,从而使纤维更加柔软,物理机械性能发生变化.采用正交试验分析和处理试验数据,研究氢氧化钠的浓度、浸碱时间、乙酸浓度、乙酰化时间等改性条件对纤维物理机械性能的影响,分析改性工艺的主要影响因素与改性后纤维的性能变化,优选出最佳亚麻纤维乙酰化改性的工艺,使改性后的纤维可纺性能得到改善,以适应高支和满足生产高档亚麻轻薄织物的要求.     

醋酐—丙酮法羟值的测定

本文对难以分析的有机高分子聚醚化合物羟值的测定,提出了设备简单、快速适用的醋酐—丙酮法。文中叙述了此法的原理、操作程序,并对其稳定性进行了讨论。