PREPARATION OF LOW MOLECULAR WEIGHT POLY（GLYCIDYL METHACRYLATE） BY PHOTOPOLYMERIZATION

Low molecular weight poly（glycidyl methacrylate）s （PGMAs） were prepared by photopolymerization in ethyl acetate, with benzophenone （BP） as photoinitiator, and triethylamine （TEA） as hydrogen donor. The existence of semipinacol dormant end groups in PGMA was confirmed by FT-IR and ^1H-NMR, and the content of the semipinacol dormant groups was determined quantitatively by ^1H-NMR measurement. The effects of various thctors, such as reaction time, BP concentration and monomer concentration on the synthesis of the polymers were investigated systematically. The molecular weights of the polymers were also investigated with GPC. It is shown that increasing BP concentration and decreasing irradiation time and monomer concentration led to a significant decrease of the molecular weights.     

SYNTHESIS OF HIGH MOLECULAR WEIGHT POLY(p-PHENYLENE SULFIDE)RESINS

利用天然气脱硫厂的酸气、氢氧化钠、对二氯苯和助剂磷酸钠，在六甲基苯磷酰三胺溶剂中，常压下缩聚４～６小时，制备了线型结晶性高分子量聚苯硫醚（ＨＭＷＰＰＳ）。该方法具有的明显优点是：设备简单、容易操作、活性高、溶剂稳定、产品收率高、成本低、适宜于大规模工业生产。     

STUDY ON SOLUBILIZATION MECHANISM IN THE SYNTHESIS OF HIGH MOLECULAR WEIGHT POLY(p-PHENYLENE TEREPHTHALAMIDE)

The salts dissolved in the amide solvent play an important role in the synthesis of high molecular weight poly(p-phenylene terephthalamide) (PPTA). The solubilization of salts was investigated in this paper. The effects of association-dissociation equilibrium of salts and the solvation of their ions as well as hydrogenbond on solubilization were discussed in some detail. The effects were attributed to cations and anions of salts respetively. Finally, the equation of solubilization was established according to the experimental results and some thermodynamic laws. The relations between molecular weight of PPTA and the solubilization were discussed.     

NOVEL HYPERBRANCHED POLY（PHENYLENE OXIDE）S WITH PHENOLIC TERMINAL GROUPS： EFFECTS OF REACTION TIME AND CORE MOLECULES ON THE MOLECULAR WEIGHT AND POLYDISPERSITY

A novel hyperbranched poly（phenylene oxide） （HPPO） with phenolic terminal groups was prepared from 4-bromo-4＇,4＂-dihydroxytriphenylmethane as AB2 monomer in dimethylsulfoxide （DMSO） via a modified Ullmann reaction. The molecular weight and polydispersity （PD） of the resulting polymers increased with increasing reaction time. In the presence of core molecules （bisphenol A and 1,3,5-trihydroxybenzene）, which have the similar molecular backbones to the reactive monomer, the molecular weight could be controlled by varying the core-to-monomer ratio. Incorporation of a very small amount of core molecules could lead to a higher molecular weight as compared with that without the addition of core molecules. However, when the core content reached certain extent, the molecular weight would decrease with the further increase in the core content. A new similar behavior of control over the PD was also obtained. The resulting polymers were characterized by ^1H-NMR, ^13C-NMR, FT-IR, and GPC.     

A SIMPLE METHOD FOR THE INCORPORATION OF LOW MOLECULAR WEIGHT DYES IN ULTRATHIN FILMS

A simple method for the fabrication of ultrathin films containing low molecular weight dye material is introduced(post-adsorption technique). The chromophore used is 4-nitro-4'-decyloxy azobenzene quaternary ammonium salt (azo-10Q).In classical layer-by-layer (LBL) procedures, where the substrate is dipped alternately into the chromophore solution and thecomplementary polyelectrolyte, the chromophore tends to desorb from the film during subsequent immersion in thepolyanion solution, and there is little or no indication of multilayer growth. The extent of desorption depends somewhat onthe selection of polyelectrolyte, the ionic strength and the pH of solution. An alternative approach is to first prepareconventional LBL films from a pair of oppositely charged polyelectrolytes, and then to soak this film into the chromophoresolution, where adsorption by penetration into the LBL film may take place. In preliminary results, a linear dependence ofUV absorbance on layer number of LBL film thus prepared was found, demonstrating the apparent effectiveness of the post-adsorption technique for the preparation of azo-10Q-containing ultrathin films.     

INVESTIGATION ON THE RELATIONSHIP BETWEEN INTRINSIC VISCOSITY AND MOLECULAR WEIGHT OF POLY (VINYL CHLORIDE-DIETHYL MALEATE)

A poly (vinyichloride-diethyl maleate) copolymer has been fractionated by repeated precipitation method. All fractions and the unfractionated sample have been characterized by viscometry, dynamic osmometry, Zimm static osmometry, light scattering and gel permeation chromatography. After correction for polydispersity, a [η]～M relationship for monodisperse polymer solutions has been obtained:[η]=1.99×10~(-3)M~(0.87) (ml/g, at 25℃, in cyclohcxanone)For the copolymer solution in THF, the second virial coefficient A_2 decreases as the molecular weight increases. The relationship isA_2=2 slope ((?)_n RT)~(-1/2).     

TRANSFER HYDROGENATION OF KETONES BY PROPAN－2－OL OVER POLY（PHENYLENE OXIDE） ANCHORED RUTBENIUM CATALYST

ＴＲＡＮＳＦＥＲ　ＨＹＤＲＯＧＥＮＡＴＩＯＮ　ＯＦ　ＫＥＴＯＮＥＳ　ＢＹ　ＰＲＯＰＡＮ－２－ＯＬ　ＯＶＥＲ　ＰＯＬＹ（ＰＨＥＮＹＬＥＮＥ　ＯＸＩＤＥ）　ＡＮＣＨＯＲＥＤ　ＲＵＴＢＥＮＩＵＭ　ＣＡＴＡＬＹＳＴ￥ＨａｎＲｏｎｇＧＡＯ；ＹｕｎＸＵ；ＳｈｉＪ...     

IN SITU COMPATIBILIZATION OF LDPE/NYLON-6 BLEND USING LOW MOLECULAR WEIGHT INTERFACIAL AGENT AS A CHEMICAL COMPATIBILIZER

In situ compatibilization of low density polyehylene (LDPE) (30%) and nylon-6(70%)blends through one-step reactive extrusion using t-BuOOH as an initiator and low molec-ular weight interfacial agents as compatibilizers was studied. The compatibilizer containeda long chain bydrocarbon, double bond and two polar functional groups which was capableof reacting with both LDPE and nylon-6 in the presence of initiator to form a copolymerat the interface of the two polymer phases. The extruded blends exhibited significant en-hancement in their compatibility based on morphological, thermal analysis and mechanicalstudies. The effect of the hydrocarbon chain length and structure of the functional groupof the compatibilizer was also examined. It was found that blends prepared by using thecompatibilizer containing longer hydrocarbon chain and amide group had better mechanicalproperties.     

STUDIES ON SEPARATION AND DETERMINATION OF THE COUMARINS IN MURRAYA PANICULATA（L）JACK BY RP－HPLC

ＳＴＵＤＩＥＳ　ＯＮ　ＳＥＰＡＲＡＴＩＯＮ　ＡＮＤ　ＤＥＴＥＲＭＩＮＡＴＩＯＮ　ＯＦ　ＴＨＥ　ＣＯＵＭＡＲＩＮＳ　ＩＮ　ＭＵＲＲＡＹＡ　ＰＡＮＩＣＵＬＡＴＡ（Ｌ）ＪＡＣＫ　ＢＹ　ＲＰ－ＨＰＬＣＳＴＵＤＩＥＳＯＮＳＥＰＡＲＡＴＩＯＮＡＮＤＤＥＴＥＲＭＩ...     

STUDIES ON SYNTHESIS AND PROPERTIES OF BIS（β－ALKOXYCARBONYALKYL）TIN POLYTHIOETHERS

ＳＴＵＤＩＥＳＯＮＳＹＮＴＨＥＳＩＳＡＮＤＰＲＯＰＥＲＴＩＥＳＯＦＢＩＳ（β－ＡＬＫＯＸＹＣＡＲＢＯＮＹＡＬＫＹＬ）ＴＩＮＰＯＬＹＴＨＩＯＥＴＨＥＲＳＣｈｅＲｏｎｇｒｕｉ（ＩｎｓｔｉｔｕｔｅｏｆｔｈｅＰｏｌｙｍｅｒＣｈｅｍｉｓｔｒｙ，ＮａｎｋａｉＵｎ...     

STUDIES ON THE TOTAL SYNTHESIS OF（－）－（2R，5S）－2－METHYL－5－HYDROXYMETHYL－δ－VALEROLACTONE

ＳＴＵＤＩＥＳ　ＯＮ　ＴＨＥ　ＴＯＴＡＬ　ＳＹＮＴＨＥＳＩＳ　ＯＦ（－）－（２Ｒ，５Ｓ）－２－ＭＥＴＨＹＬ－５－ＨＹＤＲＯＸＹＭＥＴＨＹＬ－δ－ＶＡＬＥＲＯＬＡＣＴＯＮＥＳＴＵＤＩＥＳＯＮＴＨＥＴＯＴＡＬＳＹＮＴＨＥＳＩＳＯＦ（－）－（２Ｒ，５Ｓ）－...     

STUDIES ON NUCLEOSIDES（Ⅲ）．STEREOSELECTIVE SYNTHESES OF TRIAZOLINE－THIONE NUCLEOSIDES

ＳＴＵＤＩＥＳ　ＯＮ　ＮＵＣＬＥＯＳＩＤＥＳ（Ⅲ）．ＳＴＥＲＥＯＳＥＬＥＣＴＩＶＥ　ＳＹＮＴＨＥＳＥＳ　ＯＦ　ＴＲＩＡＺＯＬＩＮＥ－ＴＨＩＯＮＥ　ＮＵＣＬＥＯＳＩＤＥＳＳＴＵＤＩＥＳＯＮＮＵＣＬＥＯＳＩＤＥＳ（Ⅲ）．ＳＴＥＲＥＯＳＥＬＥＣＴＩＶＥＳＹ...     

REACTIVE POLY（ARYLENEETHERSULPHONE） ：MALEIMIDE－TERMINATED POLY（ARYLENEETHERSULPHONE） OLIGOMERS USING N－（4－HYDROXYPHENYL） MALEIMIDE AS AN ENDBLOCKING MONOMER

ＲＥＡＣＴＩＶＥ　ＰＯＬＹ（ＡＲＹＬＥＮＥＥＴＨＥＲＳＵＬＰＨＯＮＥ）　：ＭＡＬＥＩＭＩＤＥ－ＴＥＲＭＩＮＡＴＥＤ　ＰＯＬＹ（ＡＲＹＬＥＮＥＥＴＨＥＲＳＵＬＰＨＯＮＥ）　ＯＬＩＧＯＭＥＲＳ　ＵＳＩＮＧ　Ｎ－（４－ＨＹＤＲＯＸＹＰＨＥＮＹＬ）　ＭＡＬＥ...     

STUDIES ON THE PRENYLFLAVONOIDS PART XI： THE TOTAL SYNTHESIS OF （±）－AMORISIN AND （±）－SIGMOIDIN－B

ＳＴＵＤＩＥＳＯＮＴＨＥＰＲＥＮＹＬＦＬＡＶＯＮＯＩＤＳＰＡＲＴＸＩ：ＴＨＥＴＯＴＡＬＳＹＮＴＨＥＳＩＳＯＦ（±）－ＡＭＯＲＩＳＩＮＡＮＤ（±）－ＳＩＧＭＯＩＤＩＮ－Ｂ￥ＬｉａｎＹｕｎＺＨＡＯ；ＹｕＬｉｎＬＩ（ＳｔａｔｅＫｅｙＬａｂｏｒｓｔｏｒｙｏｆ...     

INFLUENCE OF MOLECULAR STRUCTURES OF SECONDARY AMINE TERMINATED POLY（ESTER-AMINE）S ON THE CURING PERFORMANCE WITH EPOXY RESIN

Five secondary amine terminated poly(ester-amine)s(defined as PEA)with controlled molecular structures were synthesized through reacting excessive piperazine with phthalicdiglycol diacrylate(PDDA)and 1,1,1-trimethylolpropane triacrylate(TMPTA)at a constant secondary amine/acrylate group ratio of 1.5/1 and at different PDDA/TMPTA molar ratios. Both IR and ~(?)H-NMR spectra indicated that all acrylate groups were consumed in the reaction,based on which the structural parameters were calculated from the ~(?)H-NMR spectra.With decreasing PDDA/TMPTA ratio,the content of secondary amine,degree of branching,molecular weight,T_g and T_d increased accordingly.These polymers were further used as both crosslinkers and flexibilizers for a linear epoxy resin E51 to form cured films under ambient condition.The gel content, relative hardness and T_g of the resulting films increased as PEA molecules changed from linear to highly branching structures.Due to the flexibility of PEA molecules,all the films possessed excellent mechanical performance.     

3D－QSAR STUDY ON HUPERZINE A ANALOGS WITH MOLECULAR MODELING AND COMPARATIVE MOLECULAR FIELD ANALYSIS（COMFA） METHODS

３Ｄ－ＱＳＡＲＳＴＵＤＹＯＮＨＵＰＥＲＺＩＮＥＡＡＮＡＬＯＧＳＷＩＴＨＭＯＬＥＣＵＬＡＲＭＯＤＥＬＩＮＧＡＮＤＣＯＭＰＡＲＡＴＩＶＥＭＯＬＥＣＵＬＡＲＦＩＥＬＤＡＮＡＬＹＳＩＳ（ＣＯＭＦＡ）ＭＥＴＨＯＤＳ￥ＨｕａＬｉａｎｇＪＩＡＮＧ；ＫａｉＸｉａｎＣ...     

IN－SITU FTIR AND UV－VISIBLE－NEAR－IR SPECTROELECTROOHEMICAL STUDIES OF MIXED－VALENCE ISOPOLYANION Mo＿6O＿（19）￣（3－） IN APROTIC MEDIA

ＩＮ－ＳＩＴＵ　ＦＴＩＲ　ＡＮＤ　ＵＶ－ＶＩＳＩＢＬＥ－ＮＥＡＲ－ＩＲ　ＳＰＥＣＴＲＯＥＬＥＣＴＲＯＯＨＥＭＩＣＡＬ　ＳＴＵＤＩＥＳ　ＯＦ　ＭＩＸＥＤ－ＶＡＬＥＮＣＥ　ＩＳＯＰＯＬＹＡＮＩＯＮ　Ｍｏ＿６Ｏ＿（１９）￣（３－）　ＩＮ　ＡＰＲＯＴＩＣ　Ｍ...     

STUDIES ON THE DETERMINATION METHOD OF TRACE ELEMENTS IN THE FOSSIL OF DINOSAURIANEGG（Ⅰ）

ＳＴＵＤＩＥＳ　ＯＮ　ＴＨＥ　ＤＥＴＥＲＭＩＮＡＴＩＯＮ　ＭＥＴＨＯＤ　ＯＦ　ＴＲＡＣＥ　ＥＬＥＭＥＮＴＳ　ＩＮ　ＴＨＥ　ＦＯＳＳＩＬ　ＯＦ　ＤＩＮＯＳＡＵＲＩＡＮＥＧＧ（Ⅰ）ＳＴＵＤＩＥＳＯＮＴＨＥＤＥＴＥＲＭＩＮＡＴＩＯＮＭＥＴＨＯＤＯＦＴＲＡＣ...     

CARRIER PHOTOGENERATION IN POLY（N-VINYL-CARBAZOLE）-BASED PHOTOCONDUCTIVE THIN-FILM DEVICES

In this paper, photoexcitation processes in the bilayer devices based on inorganic materials and poly（N-vinylcarbazole） （PVK） were investigated. In order to clarify the roles of inorganic materials in photoconductive properties of bilayer devices, TiO2 and ZnS were chosen to combine with PVK. A model for generation of photocurrent （Iph） in single layer device of PVK was obtained. It is deduced that the recombination rate constant （Pcomb） and the ionization rate constant （y） ofexcitons should be considered as the most important factors for Iph. For inorganic materials （TiO2 or ZnS）/PVK bilayer devices, in reverse bias of-4 V, the photocurrent of 115 mA/cm^2 in the TiO2/PVK device was observed, but the photocurrent in the ZnS/PVK device was only 10 mA/cma under the illumination light of 340 nm and the light intensity of 14.2 mW/cm^2. The weaker photocurrent is attributed to the absorption of ZnS within UV region and the energy offset at the interface between PVK and ZnS, which impedes the transport of charge carriers.