检索结果-南通市图书馆

Chemical Research in Chinese Universities 2009年第5期25卷 760-766页

作者： FU Qi shi wen-fang Joint Laboratory of Polymer Thin Films and Solution Department of Polymer Science and Engineering University of Science and Technology of China Hefei 230026 P. R. China

An octa-functional acrylate of C-tetramethyl calix[4]resorcinarene（CMC-4-RA） was facilely synthesized and characterized with ^1H NMR, ^13C NMR and FTIR spectroscopy. The CMC-4-RA was added to a thiol-acrylate system with different mass ratios, and exposed to a middle pressure mercury lamp. The maximum photopolymerization rate and final vinyl group conversion in the cured film increased greatly along with CMC-4-RA addition that was monitored with Photo-DSC. The tensile strength and pendulum hardness were improved significantly after the addition of CMC-4-RA. With increasing the content of CMC-4-RA to 60%（mass fraction）, the glass transition temperature increased from 34.2 ℃ to 84.1 ℃; the cross-link density was calculated to be increased from 23.83 mmol/cm^3 to 82.40 mmol/cm^3 according to dynamic mechanical thermal analysis; the thermostability was greatly improved.

关键词： Calixresorcinarene Acrylate UV curing Film

Hyperbranched Polyurethane Acrylate Applied to UV Curable Flame Retardant Coatings

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2001年第3期17卷 331-333页

作者： ZHU Sheng-Wu shi wen-fang State Key Laboratory of Fire Science Department of Applied ChemistryUniversity of Science and Technology of ChinaHefei 230026P.R.China

UV curable hyperbranched prepolymers based on amine-ester, ester-amide and ether-amide started with AB_2-type monomers have been prepared by the authors. A series of work on allyl ether maleate hyperbranched polyesters for UV curing coatings by Hult and his colleagues has been reported. However, the UV cured films from those materials are all flammable when attached to fire without addition of flame retardants.

关键词： Flame retardant Polyurethane acrylate Phosphorus UV curing

Preparation and Conducting Behavior of Amphibious Organic/Inorganic Hybrid Proton Exchange Membranes Based on Benzyltetrazole

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2012年第2期28卷 345-352页

作者： QIAO Li-gen shi wen-fang CAS Key Laboratory of Soft Matter Chemistry Department of Polymer Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026P.R.China

A series of novel amphibious organic/inorganic hybrid proton exchange membranes with H3PO4 doped which could be used under both wet and dry conditions was prepared through a sol-gel process based on acrylated triethoxysilane（A-TES） and benzyltetrazole-modified triethoxysilane（BT-TES）.The dual-curing approach including UV-curing and thermal curing was used to obtain the crosslinked *** glycol（400） diacrylate（PEGDA） was used as an oligomer to form the polymeric *** molecular structures of precursors were characterized by 1 H,13 C and 29 Si NMR *** thermogravimetric analysis（TGA） results show that the membranes exhibit acceptable thermal stability for their application at above 200 *** differential scanning calorimeter（DSC） determination indicates that the crosslinked membranes with the mass ratios of below 1.6 of BT-TES to A-TES and the same mass of H3PO4 doped as that of A-TES possess the-T g s,and the lowest T g（-28.9 ℃） exists for the membrane with double mass of H3PO4 doped as *** high proton conductivity in a range of 9.4―17.3 mS/cm with the corresponding water uptake of 19.1%―32.8% of the membranes was detected at 90 oC under wet ***,the proton conductivity in a dry environment for the membrane with a mass ratio of 2.4 of BT-TES to A-TES and double H3PO4 loading increases from 4.89×10-2 mS/cm at 30 ℃ to 25.7 mS/cm at 140 ℃.The excellent proton transport ability under both hydrous and anhydrous conditions demonstrates a potential application in the polymer electrolyte membrane fuel cells.

关键词： Amphibious Benzyltetrazole Organic/inorganic hybrid membrane Phosphorus acid Proton conductivity

Facile Route to Aromatic Hyperbranched Poly(ester amines)

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2009年第3期25卷 400-403页

作者： ZHANG Zheng-hui shi wen-fang Department of Polymer Science and Engineering Joint Laboratory of Polymer Thin Films and Solution University of Science and Technology of China Hefei 230026 P. R. China

The aromatic hyperbranched poly（ester amines）（AHPEAs） were successfully synthesized via the mild condensation of N-4-cyanobenzyl diethanolamine hydrogenchloride as an AB2 monomer in concentrated HCI. The polymerization was monitored by FTIR to suppose the reasonable reaction mechanism. The degree of branching was determined to be 0.55 by 1H NMR with an increased conversion of up to 96%. The glass transition temperature was measured by differential scanning calorimetry to range from -19 to 15℃ The molecular weights and polydispersities were investigated by gel permeation chromatography.

关键词： Hyperbranch Poly(ester amine) 4-Cyanobenzyl chloride Alcoholysis

Photoinitiating Characteristics of Benzophenone Derivatives as Type II Macromolecular Photoinitiators Used for UV Curable Resins

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2011年第1期27卷 145-149页

作者： CHENG Liang-liang ZHANG Yong shi wen-fang CAS Key Laboratory of Soft Matter Chemistry Department of Polymer Science and Engineering University of Science and Technology of China Hefei 230026 P.. R. China

Dodecyl-benzophenone（DBP） and hexadecoxyl-benzophenone（HDBP） as type 11 photoinitiators used for radical photopolymerization systems were synthesized by Friedel-Crafts reaction, and characterized by 1H NMR and FTIR spectroscopy. The UV-Vis absorption spectra of DBP and HDBP, propitious to photopolymerization under a commercial mercury UV bulb are centered at 345 and 335 nm, respectively. HDBP has higher extinction coefficient than DBP, but lower photoinitiating efficiency. Their photoinitiating performances for EB605, a bisphenol A epoxy acrylate with 40%（mass fraction） tripropyleneglycol diacrylate （TPGDA）, resin consisting of bisphenol A epoxy acrylate and tripropyleneglycol diacrylate in the presence of triethanolamine as a coinitiator were investigated by photo-differential scanning calorimetry（photo-DSC）. DBP initiates the curing of acrylate more efficiently than HDBP, showing higher photopolymerization rate and unsaturation conversion, resulted from the poor compatibility of HDBP with the resin. The photoinitiating activity of DBP to epoxy acrylate resin is even higher than that of BP at lower loadings.

关键词： Macromolecular photoinitiator Benzophenone derivative Photopolymerization

Cure Kinetics of DGEBA with Hyperbranched Poly(3-hydroxyphenyl) Phosphate as Curing Agent Studied by Non-isothermal DSC

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2006年第1期22卷 118-122页

作者： YAO Liang DENG Jing QU Bao-jun shi wen-fang State Key Laboratory of Fire Science Department of Polymer Science and Engineering University of Science and Technology of China Hefei 230026 P. R. China

The cure kinetics of diglycidyl ether of bisphenol A （DGEBA） with hyperbranched poly （3-hydroxyphenyl） phosphate（HHPP） as the curing agent was investigated by means of non-isothermal differential scanning calorimetry （DSC） at various heating rates. The results were compared with the corresponding results by using 1,3-dihydroxybenzene（DHB） as a model compound. The results show that HHPP can enhance the cure reaction of DGEBA, resulting in the decrease of the peak temperature of the curing curve as well as the decrease of the activation energy because of the flexible --P--O-- groups in the backbone of HHPP. However, both the activation energy of the cured polymer and the peak temperature of the curing curve are increased with DHB as a curing agent. The cure kinetics of the DGEBA/HHPP system was calculated by using the isoconversional method given by Malek. It was found that the two-parameter autocatalytic model（Sestak-Berggren equation） is the most adequate one to describe the cure kinetics of the studied System at various heating rates. The obtained non-isothermal DSC curves from the experimental data show the results being accordant with those theoretically calculated.

关键词： Hyperbranched polyphosphate Cure kinetics Epoxy resin Non-isothermal DSC

Photopolymerization of Dendritic Acrylated Aromatic/Aliphatic Polyesters and Properties of Their Cured Films

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2002年第3期18卷 354-357页

作者： XU Gang LIANG Hong-bo shi wen-fang BAO Jin-wen State Key Laboratory of Fire Science and Department of Applied Chemistry University of Science and Technology of ChinaHefei 230026China Institute of Aeronautical Materials Beijing 100095

The radiative curable dendritic acrylated aromatic/aliphatic polyesters based on pentaerythritol, 1,2,4 benzenetricaboxylic anhydride and epoxy propane modified with acryloyl chloride were synthesized via a divergent procedure, and their photopolymerization kinetics was studied by photo differential scanning calorimetry. The mechanical properties and the morphology of the fracture surface of the cured dendritic polyester films were investigated by means of dynamic mechanical thermal analysis and scanning electron microscopy, respectively.

关键词： Dendritic polyester Radiation curing Photopolymerization kinetics Thermal mechanical property

Closed-form expressions for outage probability of decode-and-forward relaying over Nakagami-m fading channels

在线全文

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2010年第2期17卷 72-75页

作者： CHUAI Gang LI Xiu-xin LIU Sheng HU Yang shi fang-wen Key Laboratory of Universal Wireless Communications Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China School of Network Education Beijing University of Posts and Telecommunications Beijing 100876 China

In this article, an exact closed-form expression is derived for outage probability of decode-and-forward （DF） cooperative communications over independent identically distributed Nakagami-m fading channels. Simulation results verify that the theoretical expressions for the outage probability are correct. The optimal power allocation based on the derived outage probability is also studied.

关键词： decode-and-forward Nakagami-m fading ,outage probability optimal power allocation

在线全文

学校读者我要写书评

暂无评论

全偶氮苯官能化树枝状聚合物的合成

高等学校化学学报 2007年第5期28卷 1002-1004页

作者：张文泉施文芳中国科学技术大学高分子科学与工程系合肥230026

A series of novel dendrons and dendrimers skeleton-constructed with azobenzene moiety were synthesized with 4-carboxy-4′-(1,2-propanediolether)-azobenzene as an AB2 monomer and 4-carboxy-4′-(n-butylether)-azobenzene as a peripheral monomer via a convergent approach and proceeding in a repeated stepwise growth manner. The NMR, GPC, and MALDI-TOF-MS measurements show that the obtained products possess regular molecular architecture and thus monodispersed molecular weights. It will be of interest to investigate the self assemble behavior of the polymers and the promising applications for the dendrimers as the dendritic boxes in the subsequent works.

关键词：树枝状聚合物偶氮苯合成

Synthesis of Perfluorinated Oxetane and Surface Properties of Its Cationic UV Cured Coating as a Reactive Additive

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2012年第3期28卷 550-554页

作者： ZHAN Fu,ZHANG Yong and shi wen-fang * CAS Key Laboratory of Soft Matter Chemistry,Department of Polymer Science and Engineering,University of Science and Technology of China,Hefei 230026,P.R.China Univ Sci & Technol China Dept Polymer Sci & Engn CAS Key Lab Soft Matter Chem Hefei 230026 Peoples R China

Perfluorinated oxetane(F-OXE) was synthesized via the ring-opening reaction of epoxy-functionalized oxetane with 2-(perfluorooctyl)ethanol under base-catalysis,and characterized by FTIR and 1 H NMR *** synthesized F-OXE was mixed with a commercial cationic UV curable resin,UVR6110,as a reactive additive at different mass fractions,and UV-irradiation cured in the presence of triphenylsulphonium hexafluoroantimonate as a cationic *** surface property study of cured films indicated that both hydrophobicity and oleophobicity were effectively enhanced by the addition of a small amount of *** contact angles of water and 1-bromonaphthalene on the surface of the cured film with 1.0%(mass fraction) F-OXE loading increased from 72 o to 106o and from 0o to 76o,respectively,compared with those on the surface of the film without F-OXE *** surface tension of UVR6110-F-OXE cured film decreased greatly from 55.6 mN/m of referenced film to 22.9 mN/*** results from X-ray photoelectron spectroscopy analysis confirm the migration and aggregation effect of perfluoroalkyl group to the surface of cured *** 1%(mass fraction) addition of F-OXE,the relative content of fluorine greatly increased from 0.70%(mass fraction) in the interior of the cured film to 36.73%(mass fraction) at the surface of the cured film,whereas those of carbon and oxygen decreased from 73.29% to 40.96% and from 26.00% to 22.30%,respectively.

关键词： Cationic UV curing Oxetane Perfluoroalkyl Water and oil repellence