Polysiloxane with Pendant Benzo Crown Ether via a Spacer of Undecyloxymethyl as Stationary Phase for Capillary Chromatography

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三乙醇胺交联聚硅氧烷树脂对羧酸吸附性能研究

本文研究了甲酸、乙酸、丙酸和戊酸在三乙醇胺交联聚硅氧烷树脂上的吸附行为。通过其吸附速度、吸附等温线的研究,得出甲酸和乙酸在该树脂上以单分子吸附为主,丙酸和戊酸以多分子吸附为主,而且吸附的强弱与羧酸的解离有关,解离越强吸附越弱,反之,吸附越强。     

主链含环三硅氮烷的聚硅氧烷的合成——环硅氮阴离子引发环硅氧烷开环聚合

在极性溶剂中合成了六苯基环三硅氮烷锂盐（Ｐ３ＮＬｉ） ．在促进剂的作用下,此锂盐成功地引发了环硅氧烷的开环聚合．通过对聚合物的含氮量、１Ｈ ＮＭＲ、２９Ｓｉ ＮＭＲ 谱的测试,结果证明所得到的聚合物中含有六苯基环三硅氮烷,并研究了聚合物的分子量（ＧＰＣ） 与特性粘数的关系．     

大环聚硅氧烷分子

聚硅氧烷是一种重要的高分子材料,其优良的物理化学性能使其在化工、冶金、建筑等众多领域具有广泛的应用,由于缺少链端基,环状聚硅氧烷这种特殊的空间结构使其具有尤为特定的性质和应用性能.本文主要简述了环状聚硅氧烷相比一般线形聚硅氧烷所具有的本体、溶液和化学特性.因为聚二甲基硅氧烷是硅氧烷中最主要的一种,所以本文主要对大环聚二甲基硅氧烷的合成方法和基本性质进行了综述,并介绍了大环聚硅氧烷的应用方向,主要是在拓扑嵌入、形成索烃和聚轮烷等方面的应用.     

Brustimplantate

Breast implants are applied in a larger number each year. To prevent an adverse interaction with the body, bioinert materials are used for the fabrication, with silicones playing a major role both for the shell and the filling. Physiological saline solution is also used as biocompativble filling material. As long as biomaterials with a high purity are used, the application of breast implants can be considered as medically safe.     

LINEAR POLYSILOXANE WITH DIBENZO-18-CROWN-6 MOIETIES AS LIQUID MEMBRANE CARRIER

A modified method of preparing crown functionalized linear polysiloxane has beendescribed. 4'-Allyldibenzo-18-crown-6 was subjected to hydrosilylation withmethyldichlorosilane, followed by polycondensation with silanol-terminatedpolydimethylsiloxane to give the title crown functionalized linear polysiloxane. Thetransport properties of sodium, potassium, and ammonium salt through a bulk liquidmembrane system using the new type of crown functionalized linear polysiloxane as acarrier were investigated. It is worthy to point out that the carrier can be used repeatedlyat least six runs with no apparent change in the transport rate of potassium ion.     

STUDIES ON POLYSILOXANE-POLYSTYRENE COMPOSITE LATEXES

Polysiloxane-polystyrene composite latexes were prepared by two-stage emulsionpolymerization. Polymerization of styrene in swollen polysiloxane latex particles were studied.Formation of simple polystyrene particle in the 2nd-stage polymerization depends on the particlesize of the lst-stage latex and the polymerization temperature. Polystyrene domains in thevulcanizates reinforce the silicone rubbers effectively.     

SYNTHESIS AND CHARACTERIZATION OF SIDE CHAIN LIQUID CRYSTATALLINE POLYSILOXANES CONTAINING BENZYL ETHER LINKING UNITS

Side chain liquid crystalline polysiloxanes containing benzyl ether linkingunits were synthesized by the hydrosilylation of poly (methylhydrosiloxane) with a series of4-(4-alkoxybenzyloxy)-4'-allyloxybiphenyl monomers [4-(4-methoxybenzyloxy )-4'-allyloxy-biphenyl(M_1), 4-(4-ethoxybenzyloxy)-4'-allyloxybiphenyl (M_2), 4-(4-propoxybenzyloxy)-4'-allyloxybiphenyl (M_3), 4-(4-butoxybenzyloxy)-4'-allylox(M_4), 4-(4-pentoxy-benzyloxy)-4'-allyloxybiphenyl (M_5), 4-benzyloxy-4'-allyloxybiphenyl (M_6)]. The phasebehavior of monomeric and polymeric liquid crystals was characterized by differential scan-ning calorimetry and optical polarization microscopy where the groups are ranged frommethoxy to pentoxy Both the monomeric and polymeric liquid crystals exhibit 1iquidcrystal behaviors.     

可紫外光固化的超支化聚硅氧烷合成及固化研究

同线型聚硅氧烷聚合物相比，超支化聚硅氧烷聚合物具有低粘度、高反应活性和良好的相容性等特点，其中以制备超支化的聚硅氧烷基硅氧烷和聚烷氧基硅氧烷为主．对于超支化聚硅氧烷主要是以ABx（X=2～6）（其中A为双键，B为硅氢键）型单体为原料，在氯铂酸或Pt／C的催化下，通过硅氢加成反应一步制备，最终聚合物的端基（B）为硅氢键，而双键则完全反应，此外也可通过含不同数目烷氧基硅烷的水解缩合制备超支化聚硅氧烷．