PVA/UiO-66复合薄膜的制备及性能表征

采用溶剂热法合成出了金属有机骨架材料UiO-66,并通过流延法制备出了一系列PVA/UiO-66复合膜.通过红外光谱仪(FTIR)、X射线衍射仪(XRD)、扫描电子显微镜(SEM)、接触角、溶胀度、拉伸强度和透光性等表征方法,详细研究了UiO-66含量对复合膜各种物性的影响.结果表明,PVA在经富马酸交联后,耐水溶胀性...     

Synthesis of 4-Methacryloylmethyldiphenylsulphone and its Copolymerization

This paper presents the synthesis of two new compounds: 4-chloromethylphenylsulphone (4-CmDPhSu) and 4-methacryloylmethylphenylsulphone (4-McMDPhSu) which are derivatives of diphenylsuphone. Introduction of the methacryloyl group into 4-CmDPhSu transferred this compound into the vinyl monomer 4-McMDPhSu. This monomer was polymerized and copolymerized with the use of two types of initiators: a mixture containing benzoyl peroxide (BP) and N,N-dimethylaniline (DMA), as well as the photoinitiators Irgacure 651 or Darocur 1173. In further studies, its copolymers with methyl methacrylate were used. Their thermomechanical properties were studied.     

Synthesis and polymerization of alkyl halide-functional cyclic carbonates

To increase the diversity in functional aliphatic polycarbonates, a series of novel chloro- and bromo-functional six-membered cyclic carbonate monomers were synthesized. Despite asymmetry in the monomer functionalities, homopolymerization of the monomers afforded semicrystalline polycarbonates with a high tendency to crystallize from the melt and/or on precipitation from a THF solution. Melting points were found in the 90-105 °C or 120-155 °C range for polymers comprising methyl or ethyl moieties, respectively, in the backbone. The monomers were further copolymerized with trimethylene carbonate to form random copolymers. Even among some of these random copolymers elements of semicrystallinity were found as confirmed by melting endotherms in DSC. The results clearly show that the incorporation of alkyl halide functionalities in aliphatic polycarbonates may lead to materials with a high ability to form crystallites, even in random copolymers, likely driven by polar interactions due to the presence of the halide functionalities.     

Development of a novel emitting vinyl polymer and its application in organic electroluminescent devices

Abstract— A novel emitting vinyl polymer, poly[4‐(7‐{4‐[N,N‐bis(9,9‐dimethylfluoren‐2‐yl)amino]phenyl}‐2,1,3‐benzothiadiazol‐4‐yl)phenylethylene] (PVFABT), was designed and synthesized. The new vinyl polymer was found to form smooth amorphous films with a high glass‐transition temperature of 199°C. The polymer possesses bipolar character with both electron‐donating and accepting properties. It undergoes reversible anodic oxidation and cathodic reduction to give stable cation and anion radicals. It exhibits intense orange fluorescence in solution and as film. A multilayer organic electroluminescent device using PVFABT as an emitting material emitted orange light, exhibiting high performance.     

苎麻织物的吸水散湿性能研究

本文利用回归分析方法探讨了苎麻织物某些结构因素与吸水散湿性能之间的关系。实验结果表明:影响吸水率的主要因素是织物组织与平方米重。织物的散湿性能可用特征参数——散湿加速度a′及初始散湿速率b′来表述;影响a′的主要因素是织物组织,而影响b′的主要因素是平方米重与织物组织。     

氯丁橡胶辐射硫化工艺的研究

研究了氯丁橡胶的辐射硫化工艺,发现含有４份多官能团单体４Ｇ,４份氧化镁及３０份碳黑的氯丁橡胶试样接受３０￣５０ｋＧｙ电子束辐射后,发生了交联。产品物理性能均达到或超过了化学硫化可达到的数值,因而在某些场合氯丁橡胶辐射硫化法可以取代化学硫化法。     

Electrochemically induced hydrogenolysis of 1,1-dibromoalkenes to vinyl bromides

Vinyl bromides 2a-f, useful intermediates in organic synthesis, have been obtained under mild conditions and in good yields via electrochemical reduction of 1,1-dibromoalkenes 1a-f (readily available substrates). The reduction has been carried out in MeCN-tetraethylammonium perchlorate (TEAP) solutions, in the presence of a proton donor, at a Au, Hg, C or Ag cathode. The use of specific reducing agents, catalysts and bases, employed in the classical procedures, has been avoided. The isomeric E/Z ratio in vinyl bromides 2a-f is affected by the cathode material.     

Surface wetting phenomena of plasma polymer-coated sheets of poly(l-lactic acid)/poly(butylene succinate)

Water-repellent surfaces were fabricated on blend sheets of poly(l-lactic acid)/poly(butylene succinate) with various blending ratios by the successive processing; (1) plasma etching, followed by (2) the hydrophobic plasma polymer coating. Rough morphology was formed effectively on the mosaic structured surface of blend sheets via the oxidative etching, and advanced water repellency was achieved after the thin membrane coating was synthesized with a hydrophobic plasma polymer coating by use of hexamethyldisiloxane or hexamethyldisilazane. High water repellency is expressed through the columnar hair-like structured model, where the air-water surface interaction in the voids is taken into account.     

The chemistry of α, β-unsaturated sulfoxides and sulfones: an update

A comprehensive review of recent chemistry of α, β-unsaturated sulfoxides and sulfones is presented. Emphasis has been placed on new reactions and strategies, stereo- and enantio-selective reactions, and emerging areas of interest such as metal-mediated asymmetric synthesis, solid-phase organic synthesis (SPOS), and cascade or ‘Domino’ reactions.     

The Effect of Variation of the Isocyanate Content on the Refractometric Determination of the Concentration in Polyurethane Treatment Baths

A knot not previously used in the textile industry, the double-harness bend, is described and its performance in torque-unbalanced weaving yarn reported.

It is shown that the knot can be tied in three distinct ways, which behave differently under stress when tied in torque-unbalanced yarn. The performance of the knots is compared with that of the fisherman's knot, and it is shown that the best of the double-harness bends is likely to offer improved weaving.