水乳液型纸塑复合粘合剂的研制

研究以丙烯酸酯为主体的水乳液型纸塑复合粘合剂的制备方法 .考察了单体配比、加料方式、引发剂与乳化剂的用量对产品性能的影响 .     

甲基丙烯酸丁酯的"活性"/可控自由基聚合研究

提出一个新的原子转移自由基聚合催化／引发体系,将该体系应用于甲基丙烯酸丁酯的聚合反应,所得聚合物的相对分子质量分布窄（１．３〈－／Ｍｗ／－／Ｍｎ〈１．４）聚合物数均分子质量－／Ｍｎ与单体转化率呈线性关系,此体系以结构简单的二氯甲烷为引发剂,以物质的量比为１：２的四水合氯化亚铁与三苯基膦的反应产物作催化剂,同时还分别对以三氯甲烷、四氯化碳为引发剂时甲基丙烯酸丁酯的聚合反应进行了讨论。     

新型阴离子聚合引发剂的合成和表征

以对甲氧基苯甲酸为原料经多步合成,得到了含噻二唑环的新型阴离子型聚合引发剂,用ＩＲ,ＮＭＲ对产物进行了表征。     

微波辐照合成单分散、大粒径的聚苯乙烯微球

以聚乙烯吡咯林酮为稳定剂,十六醇为助稳定剂,４,４’－偶氮二异（４－氰基）戊酸或偶氮二异丁腈为引发剂,无水乙醇为分散介质,在微波辐射合成了聚苯乙烯大粒径,在透射电镜下观察粒子形状和大小,制备出直径１－２．５μｍ的单分散聚苯乙烯微球,并讨论了引发剂浓度对所得聚合物颗粒直径和直径分布的影响。     

Fragile X mental retardation protein interacts with TDG

Fragile X syndrome is the most common form of inherited mental retardation disease, resulting from absent of expression of its disease geneFMR1. To study the function of the fragile X mental retardation protein (FMRP) through protein/protein interaction, a mouse embryo cDNA library was screened by the yeast two-hybrid system. A clone was found to interact specifically with FMRP. The cDNA of this clone (Genbank accession number af 102875) encoded a protein highly homologous to human G/T mismatch-specific DNA thymine glycosylase (hTDG). Interactions between various alternatively spliced FMRP isoforms and a series of mTDG deletion proteins were further studied in the yeast two-hybrid system and their interaction amino acid regions were determined. Interaction between FMRP and TDG existed inside exon 13 of FMRP (amino acid residue 397–425) and around amino acid residue 122–346 of TDG. These results will be helpful to the study of the biological role of FMRP.     

Synthesis and characterization of amphiphilc block copolymer poly(methyl acrylic acid)-block-polytetrahydrofuran

Under the specially designated condition the polymerization of both tetrahydrofuran (THF) and tert-butyl methacrylate (tBMA) is a living one. The diblock copolymer, poly(tert-butyl methacrylate)-block-polytetrahydrofuran (PtBMA-b-PTHF), was successfully synthesized by means of the coupling reaction of living cationic PTHF+, SbF6- with living anionic PtBMA-, Li+. LiCl, which has a beneficial effect on the molecular weight distribution (MWD) in the anionic polymerization of (meth)acrylates, hinders the coupling reaction of living chains and cannot be used in the preparation of tBMA precursor. The hydrolysis of the aforementioned diblock copolymer under acid condition results in the amphiphilic diblock copolymer, i.e. poly(methyl acrylic acid)-block-polytetra- hydrofuran (PMAA-b-PTHF). The diblock copolymers were characterized with GPC and IR.     

聚醚多元醇大分子单体与苯乙烯/丙烯腈共聚合反应动力学研究

利用大分子单体法合成了聚合物聚醚多元醇 .测定了各反应条件下乙烯基单体的转化速率和最终产品中微粒大小 .发现聚合反应的动力学规律 ,与以小分子物质为反应介质的分散聚合基本一致 .大分子单体用量、搅拌速率和反应温度均影响乙烯基单体转化速率和微粒大小 .     

本体法聚丙烯CSTR建模研究

以 Hypol工艺聚丙烯反应器为研究对象 ,根据汽液平衡和聚合反应动力学方程 ,建立了丙烯聚合机理模型。利用 BWR状态方程结合亨利定律计算液相中的氢气浓度 ,避免了求解多元平衡问题 ,提高了计算速度。利用现场工况数据 ,模型可以实时预报聚丙烯的熔融指数 ,聚合釜的聚合率、浆液浓度、聚合热等重要参数。计算结果较好地符合现场实测数据 ,熔融指数 (MI)的平均预报误差为 1 .6 % ,其它参数的预报也取得了满意的效果 ,可在线运行 ,指导生产     

Synthesis of styrene and tetrahydrofuran block copolymers by in situ transformation

In order to transfer the halogen terminus of polymers for block copolymer synthesis, the in situ transformation of living free radical polymerization of styrene into living cationic ring-opening polymerization of tetrahydrofuran was successfully performed. Three different initiator/catalyst systems of styrene were employed, i.e. (a) PhCH2Cl/ Bpy/CuCl, (b) 1-PEBr/Bpy/CuCl and (c) CCL/BDE/CuCl system. With these monofunctional initiator or difunction-al initiator, both AB and ABA type block copolymers of styrene and tetrahydrofuran were obtained using a silver salt with strong acid (AgC104) as the transformation agent in the transformation of polymerization type. Characterization of these copolymers by nuclear magnetic resonance hydrogen spectra ('H-NMR) , gel permeation chromatography (GPC) and differential scanning calorimetry (DSC) indicated this method is simple and feasible.     

双二硫代亚乙基四硫代富瓦烯聚合物的成膜和导电性能

将双羟烷基及双甲酸甲酯基取代的双二硫代亚乙基四硫代富瓦烯分别与己二酰氯及己二醇缩聚得到了两种含ＢＥＤＴ－ＴＴＦ结构单元的聚合物,用凝胶渗透色谱测定了聚合物的相对分子质量,讨论了聚合度ｎ对成膜性的影响,采用旋转涂膜法制得了它们的固体膜。经碘氧化后,制得ＣＴ－络合物,测试了导电率及其随时间的衰减。