Bibliographic Information

Measurement of polymer surface energy - effect of matrix materials on polymer film formation.     Wei, Xianzong; Wang, Jianqi.    Shijiazhuang No. 1 Rubber Fact.,  Shijiazhuang,  Peop. Rep. China.    Huaxue Yu Nianhe  (1991),   (1),  24-7.  CODEN: HYZHEN  ISSN: 1001-0017.  Journal  written in Chinese.    CAN 115:257360    AN 1991:657360    CAPLUS   (Copyright 2004 ACS on SciFinder (R)) 

Abstract

Polymer solns. formed homogeneous films on Al probably due to the similar surface energy of Al (0.0378 N/m) and polymers.  Polymer solns. hardly formed homogeneous films on glass due to the high surface energy of glass and the presence of -SiOH group which could adsorb certain amt. of water.  Surface energies of the polymers detd. by the method proposed by D.H. Kaeble et al. (1974) were more accurate compared with those detd. with the method proposed by W.A. Zisman (1963) or F.M. Fowkes (1964).  The calcd. surface energy for polyethylene and cis-polybutadiene rubber showed neg. values due to the low polarity of these polymers.

Bibliographic Information

Kinetics and mechanism of carbon monoxide substitution by phosphites of dodecacarbonyltetracobalt.     Wang, Jianqi; Shen, Jiankun; Gao, Yici; Shi, Qizhen; Basolo, Fred.    Dep. Chem.,  Lanzhou Univ.,  Lanzhou,  Peop. Rep. China.    Journal of Coordination Chemistry  (1991),  23(1-4),  345-50.  CODEN: JCCMBQ  ISSN: 0095-8972.  Journal  written in English.    CAN 115:79915    AN 1991:479915    CAPLUS   (Copyright 2004 ACS on SciFinder (R)) 

Abstract

The otherwise very fast CO substitution of Co4(CO)12 by P(OMe)3 and P(OEt)3 in aprotic solvents, affording phosphite-monosubstituted products, was retarded by the use of CHCl3 as solvent.  This made it possible to investigate these reactions by conventional methods.  Kinetic data were obtained by following changes in IR spectra during reaction.  The rates show predominantly a ligand-dependent pathway, with the usual 2-term rate law, rate = (k1 + k2[P(OR)3])[Co4(CO)12].  It is suggested that the rates are retarded in protonic solvents by decreasing the nucleophilicity of phosphites due to an H bonding interaction between the H atom of CHCl3 and the O atoms of the ligands.

Bibliographic Information

An investigation of the flame retardation mechanism of polypropylene containing a chlorine flame retardant system by XPS(ESCA).     Wang, Jianqi; Feng, Daming; Wu, Wenhui; Zeng, Minxiu; Li, Yi.    Dep. Chem. Eng.,  Beijing Inst. Technol.,  Beijing,  Peop. Rep. China.    Polymer Degradation and Stability  (1991),  31(2),  129-40.  CODEN: PDSTDW  ISSN: 0141-3910.  Journal  written in English.    CAN 114:208499    AN 1991:208499    CAPLUS   (Copyright 2004 ACS on SciFinder (R)) 

Abstract

The flame-retarding mechanism of polypropylene contg. a Cl system was explored by XPS(ESCA).  Chem. states of Cl and Sb on the surface as a function of temp. were obtained.  The synergistic effect between Cl and Sb was discussed on the basis of Cl1- on the surface.  The instability of metallic Sb in the surface was also revealed by the absence of Sb0 from Sb 3d-spectra.

Bibliographic Information

Surface characterization of blended poly(ether-ester) multiblock copolymer and its blood compatibility.     Ji, Kejian; Wang, Jianqi; Li, Xuefen; Chen, Chuanfu.    Dep. Chem. Eng.,  Beijing Inst. Technol.,  Beijing,  Peop. Rep. China.    Gaofenzi Xuebao  (1990),   (2),  168-75.  CODEN: GAXUE9  ISSN: 1000-3304.  Journal  written in Chinese.    CAN 113:237791    AN 1990:637791    CAPLUS   (Copyright 2004 ACS on SciFinder (R)) 

Abstract

By using XPS, surface contact angle, surface potential and blood compatibility, the relation between the compn. and property of the surface and the blood compatibility of poly (ether-ester) multiblock copolymer and its blend were studied.  The hydrophilic and hydrophobic balance, the distribution of the soft segment in the depth and zeta potential of the materialsurfaces were important factors affecting blood compatibility of the copolymers.

Bibliographic Information

X-ray photoelectron spectroscopic study of glass surface silylation.     Wang, Jianqi; Wei, Xianzhong.    Dep. Chem. Eng.,  Beijing Inst. Technol.,  Beijing,  Peop. Rep. China.    Fenxi Huaxue  (1990),  18(2),  106-11.  CODEN: FHHHDT  ISSN: 0253-3820.  Journal  written in Chinese.    CAN 113:10761    AN 1990:410761    CAPLUS   (Copyright 2004 ACS on SciFinder (R)) 

Abstract

The surface chem. of glass silylated by (Me3Si)2NH (HMDS) and Me2SiCl2 (DMDCS) was studied by XPS (ESCA).  DMDCS formed polymeric linkages on the glass surface with a silylated layer <8 .ANG., presenting a striking contrast to HMDS.  Only a very thin layer of the silylated surface was obsd. in the latter case.  The contamination by Na2CO3 and NaHCO3 layers on the glass surface was easily eliminated by DMDCS silylation via surface reactions.

Bibliographic Information

Mechanistic study of polynitro compounds by XPS.     Wang, Jianqi; Lang, Hengyuan.    Dep. Chem. Eng.,  Beijing Inst. Technol.,  Beijing,  Peop. Rep. China.    Science in China, Series B:  Chemistry, Life Sciences, & Earth Sciences  (1990),  33(3),  257-66.  CODEN: SCBSE5  ISSN: 1001-652X.  Journal  written in English.    CAN 113:9049    AN 1990:409049    CAPLUS   (Copyright 2004 ACS on SciFinder (R)) 

Abstract

The importance of the hydroxyl groups of polynitrophenols in thermal decompn. is studied by XPS (ECSA).  Intramol. charge transfer with drastic change during the time of the thermal decompn. is envisaged as an indicator capable of following the reaction.  In combination with CNDO/2 SCF MO models, XPS data allow information to be derived on the relative stability of N-contg. species left in the surface of energetic materials during decompn.

Bibliographic Information

Study of surface chemistry and catalytic oxidative activity of nitrogen-modified activated carbon by XPS.     Wang, Jianqi; Xie, Wenchang.    Dep. Chem. Eng.,  Beijing Inst. Technol.,  Beijing,  Peop. Rep. China.    Cuihua Xuebao  (1989),  10(4),  357-64.  CODEN: THHPD3  ISSN: 0253-9837.  Journal  written in Chinese.    CAN 112:101151    AN 1990:101151    CAPLUS   (Copyright 2004 ACS on SciFinder (R)) 

Abstract

The catalytic oxidative ability (for oxalic acid and Fe) of the activated C was increased by surface treatment with melamine and urea.  XPS data revealed that the state and the content of N on the surface layers correlated with the catalytic activity.  Based on the effect of treatment temp. and the reversible deactivation process, a synergistic model derived from the fact that 2 types of N structure were found on the surface was proposed.

Bibliographic Information

XPS investigation of intramolecular charge transfer in polynitro-aminobenzenes.     Wang, Jianqi; Wu, Wenhui; Zeng, Minxiu; Lang, Hengyuan.    Dep. Chem. Eng.,  Beijing Inst. Technol.,  Beijing,  Peop. Rep. China.    Journal of Electron Spectroscopy and Related Phenomena  (1988),  46(4),  363-72.  CODEN: JESRAW  ISSN: 0368-2048.  Journal  written in English.    CAN 110:104273    AN 1989:104273    CAPLUS   (Copyright 2004 ACS on SciFinder (R)) 

Abstract

The shake-up energy DE*, which depends on the ionization potential (IP) of the neutral (poly)nitroaminobenzenes, vanishes for IP » 8.4 eV.  The l values, which measure the contribution of intramol. charge-transfer configurations in the MIM models correlate rather well with the difference EII - EI, i.e., the difference of the peak positions corresponding to lower and higher binding energies.

Bibliographic Information

The helium Ia photoelectron spectra of nitro-substituted indazoles - an example of "orbital switching".     Wang, Jianqi; Heilbronner, E.    Beijing Inst. Technol.,  Beijing,  Peop. Rep. China.    Huaxue Xuebao  (1983),  41(12),  1146-52.  CODEN: HHHPA4  ISSN: 0567-7351.  Journal  written in Chinese.    CAN 100:174207    AN 1984:174207    CAPLUS   (Copyright 2004 ACS on SciFinder (R)) 

Abstract

The photoelectron spectra of ten indazoles (I; R = H, O2N; R1 = H, Br) were assigned using perturbation MO calcns.  The shift to higher ionization potential caused by the NO2 group was interpreted as orbital switching and the position of NO2 showed no influence on the shift. 

Bibliographic Information

Interaction of Walsh- and p-orbitals. Photoelectron spectra of cyclopropyl-substituted benzenes.     Wang, Jianqi; Honegger, Evi; Heilbronner, Edgar; Schmelzer, Andreas.    Sixth Dep.,  Beijing Inst. Technol.,  Beijing,  Peop. Rep. China.    Scientia Sinica (English Edition)  (1982),  25(3),  236-49.  CODEN: SSINAV  ISSN: 0582-236X.  Journal  written in English.    CAN 96:198931    AN 1982:198931    CAPLUS   (Copyright 2004 ACS on SciFinder (R)) 

Abstract

The photoelectron spectra of a series of cyclopropylbenzenes are recorded and discussed.  Although their interpretation is made difficult by conformational problems, with the possible exception of hexacyclopropylbenzene, the Walsh orbitals of the cyclopropyl group interact appreciably with the p-system to which they are attached in both the bisected and perpendicular conformation.

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