PDMDAAC-AM共聚物的反相乳液聚合研究

研究了用二甲基二烯丙基氯化铵(DimethylDiallylAmmoniumChloride，DMDAAC)和丙烯酰胺(Acylamide，AM)为原料。以煤油为分散剂，在反相乳液环境中合成PDMDAAC-AM(Poly DMDAAC—AM)的方法．从反相乳液聚合的机理出发。研究了油水体积比、引发剂的用量、单体配比、引发温度和反应温度等因素对共聚产物的特性黏度和转化率的影响，确定了最佳反应条件．在DMDAAC／AM=2：8，油水比为3：7，采用过硫酸钾为引发剂，其用量为体系总质量的0．05％的条件下，采用逐步聚合的方法得到了固含量为45％，特性黏度为800．5cm^3／g，溶解迅速且絮凝效果好的产品．     

分散剂对三元共聚反相悬浮聚合法合成高吸水性树脂的影响

以丙烯酸、丙烯酞胺、2—丙烯酰胺-2—甲基丙磺酸为原料，过硫酸钾为引发剂，N，N—亚甲基双丙烯酰胺为交联剂，环已烷为连续相，水为分散相，用反相悬浮聚合法合成了一系列高吸水性树脂，考察了分散剂种类、用量、混合分散剂、防粘剂对树脂物理状态和吸水性能的影响。     

多元有机载体固定化酶水解氨基酸研究

选用反应性单体丙烯酰胺(AM)、N-羟基琥珀酰亚胺(NHM),以N,N’-亚甲基(双丙烯酰胺)(GM)为交联剂,以甲酰胺为制孔剂条件下进行反相悬浮聚合,得到珠状共聚物载体,该载体是一种新的载体形式,在国内外的相关文献中均未见报道.将载体分别用吸附和包埋两种方法固定化中性蛋白酶,测得吸附和包埋两种载体固定化酶量分别为0.328 0和0.026 4 mg/g,固定化酶的活性分别于175.63~484.72μ/g和50.95~82.25μ/g之间变化,比较吸附法和游离态酶水解蚯蚓体蛋白的氨基酸含量,将中性蛋白酶用吸附法固定在所合成的载体上可得到高活性的生物催化剂.     

Mathematical Simulation of High-Conversion Binary Copolymerization

A new model for mathematical simulation of high-conversion binary copolymerization was established by combination of the concept of the three stage polymerization model (TSPM) proposed by Qin et al. for bulk free radical homopolymerization with the North equation to describe high-conversion copolymerization reaction exhibiting a strong gel effect, and the mathematical expressions of this new model were derived. Like TSPM, the new model also assmnes that the whole course of binary copolymerization can be divided into three different stages: low conversion, gel effect and glass effect stages. In addition, the reaction rate constants and the initiator efficiency at each copolymerization stage do not vary with conversion. Based on the expressions derived, a plot method for determining the overall rate constants and critical conversions was proposed. The literature data on conversion history for styrene (St)-methyl methacrylate (MMA) and ethylene glycol dimethacrylate (EGDMA)-MMA copolymerizations were treated to examine the model, which shows that the model is satisfactory.     

Sulfonate-containing Copolymers Prepared by SemiContinuous Emulsion Copolymerizaiton of Styrene and Sodium Styrene Sulfonate

Soap-free emulsion copolymerization of styrene （St） and sodium sulfonate styrene （NaSS） could yield homodisperse sulfonate-containing particles with clean surface. But the incorporation of NaSS could never be increased beyond 2.6 % by weight in the conventional batch and seeded emulsion copolymerization in the ab- sence of emulsifier because large amounts of soluble polyelectrolyte would unstablize the reaction system if ex- cessive amount of NaSS was used. In our work, semi-continuous copolymerizations were carried out in the presence of mixed emulsifiers, and a new method to purify the latex polymer was developed. The influences of the NaSS mole ratio in the total monomers and the monomer addition time on the S content in the purified copolymer were investigated by elemental analysis.     

NVF/DMAM的共聚反应和相应共聚物的玻璃化温度(NVF-体系的共聚反应及其共聚物性能…Ⅳ)

用N-乙烯基甲酰胺与甲基丙烯酸缩水甘油酯进行不同摩尔配比的共聚反应,分析研究不同摩尔配比的共聚反应过程.并对共聚产物进行元素分析,测定相应共聚物的玻璃化转变温度.为N-乙烯基甲酰胺与它的共聚物代替聚丙烯酰胺及其相应系列共聚物的开发提供了实验依据.     

NVF/DMAM的共聚反应和相应共聚物的玻璃化温度(NVF-体系的共聚反应及其共聚物性能…Ⅲ)

用N-乙烯基甲酰胺与N,N-二甲基丙烯酰胺进行不同摩尔配比的共聚反应,分析研究不同摩尔配比的共聚反应过程.并对共聚产物进行元素分析和红外光谱分析,测定了相应共聚物的玻璃化转变温度.为N-乙烯基甲酰胺与它的共聚物代替聚丙烯酰胺及其相应系列共聚物的开发提供了实验依据.     

甲基丙烯酸甲醇与氰乙基化交联淀粉的接枝共聚反应及其改性接枝物对金属离子吸附性能的研究

以ＡＰＳ－ＴＵ和ＡＰＳ－Ｕ为引发体系，研究了氰乙基化交联淀粉与甲基丙烯酸甲酯（ＭＭＡ）的接枝共聚反应规律；ＩＲ，ＳＥＭ表征了产物的结构；当［ＡＰＳ］＝［ＴＵ］＝［Ｕ］＝３×１０－２Ｍ，［ＭＭＡ］＝６×１０－１Ｍ，Ｓ：Ｌ＝４：１００，６０℃，反应６小时时，Ｇ％、Ｅ％值最高．用ＮＨ２ＮＨ２改性后，含－ＣＯＯＮＨＮＨ２功能基的接枝共聚淀粉对Ｃｕ、Ｃｄ、Ｃｒ、Ｐｈ等重金属离子有较好的吸附性能．     

甲基丙烯酸甲酯与琼脂糖的接枝反应及其共聚物的研究

本文研究硝酸铈铵作引发剂，甲基丙烯酸甲酯与琼脂糖的接枝共聚反应．考察了引发剂浓度、单体浓度、反应温度、反应时间及加料顺序对转化率，接技效率等的影响．红外光谱及热分析结果表明，所得产物为接枝共聚物．共聚物的玻璃化转变温度随接枝百分率的增加而降低，接枝共聚物可溶解于部分有机溶剂剂，并具有良好的热压成型性质．     

乙烯系单体自由基聚合的阻聚效应(XX)取代哌啶羟胺及其稳定自由基对苯乙烯-甲基丙烯酸甲酯共聚合的影响

研究了２，２，６，６－四甲基－４－羟基哌啶羟胺（ＴＭＨＰＨＡ）和２，２，６，６－四甲基－羟基哌啶－１－氧自由基（ＴＭＨＰＯ）对偶氮二异丁腈（ＡＩＢＮ）６０℃引发的苯乙烯（Ｍ１）－甲基丙烯酸甲酯（Ｍ２）共聚合的行为．结果表明，两种阻聚剂对苯乙烯（Ｓｔ）－甲基丙烯酸甲酯（ＭＭＡ）共聚合均呈现良好的阻聚效应，其中ＴＭＨＰＨＡ略优于ＴＭＨＰＯ；同时观察到Ｓｔ－ＭＭＡ共聚表观活化能和竞聚率表现出的差异．当阻聚剂为２００μｇ时，共聚物组成发生改变，它们的恒比共聚点由对照实验的０．５２９分别变化为０．５４３（ＴＭＨＰＨＡ）和０．５６７（ＴＭＨＰＯ）．