Bibliographic Information 

The application of artificial neural network (ANN) technique to formulation design of flame retardant polymers. Part I. Intumescent flame retardant PA-66 composites.     Xia, Juntao; Xiao, Chongwei; Wang, Jianqi; Huang, Congming.    National Laboratory of Flame Retardant Materials,  Beijing Institute of Technology,  Beijing,  Peop. Rep. China.    Journal of Fire Sciences  (2001),  19(1),  3-17.  CODEN: JFSCDV  ISSN: 0734-9041.  Journal  written in English.    CAN 135:167476    AN 2001:194422    CAPLUS   (Copyright 2004 ACS on SciFinder (R)) 

Abstract 

The application of the artificial neural network (ANN) to the formulation design of the halogen-free flame retardant polyamide-66 with natural color was carried out.  The ANN-based software, flame retardant expert system FRES 2.0 for FR polymer formulation design, was developed and used in this study.  The optimized output gives LOI values in accordance with expts.  It follows that the 3-layer BP (back-propagation) network based modeling proved to be most useful in dealing with problems with serious non-linearity encountered in formulation design of flame retardant polymer compds. 

Bibliographic Information 

An XPS investigation of thermal degradation and charring of cross-linked polyisoprene and polychloroprene.     Hao, Jianwei; Wilkie, Charles A.; Wang, Jianqi.    National Laboratory of Flame Retardant Materials, School of Chemical Engineering and Materials Science,  Beijing Institute of Technology,  Beijing,  Peop. Rep. China.    Polymer Degradation and Stability  (2001),  71(2),  305-315.  CODEN: PDSTDW  ISSN: 0141-3910.  Journal  written in English.    CAN 134:296222    AN 2001:114363    CAPLUS   (Copyright 2004 ACS on SciFinder (R)) 

Abstract

Our interest in butadiene-contg. polymers had led to an investigation of the thermal degrdn. of polyisoprene, PIP, and polychloroprene, PCP.  The connection between crosslinking and thermal stability through an examn. of PIP and PCP has been reported.  Like the course of thermogravimetric anal. (TGA) the crosslinking and charring of polymers subjected to heat can also be exptl. obsd. as function of temps. by the pseudo-in-situ XPS.  Data acquisition of Cls spectra as function of temp. permits us to explore: (1) the extent of crosslinking and/or carbon accumulation of systems of PCP and PIP with/without initiators, benzoyl peroxide and dicumyl peroxide, via the anal. of the relative intensity vs. temp.; and (2) the onset of charring by detg. the limiting transition temp. of the graphite-like structure and particularly the plasmon loss (DEL).

Bibliographic Information

Comparative study of the effect of aluminosilicates on intumescent flame retardancy of PP/APP/PER systems by CONE/LOI/XPS.     Wang, Jianqi; Wei, Ping; Hao, Jianwei.    National Laboratory of Flame Retardant Materials, School of Chemical Engineering & Materials Science,  Beijing Institute of Technology,  Beijing, 100081,  Peop. Rep. China.    Abstracts of Papers - American Chemical Society  (2000),  220th  PMSE-069.  CODEN: ACSRAL  ISSN: 0065-7727.  Journal; Meeting Abstract  written in English.    AN 2000:797832    CAPLUS   (Copyright 2004 ACS on SciFinder (R)) 

Abstract

Recently, zeolites and montmorillonite have become of increasing interest in IFR PP/APP/PER systems.  Studies on degrdn. and charring by the classical reaction in the presence of zeolites, montmorillonite in respect to blends with Al2O3 and SiO2, each characterized by Cone/LOI/XPS, were conducted in this lab.  It can be concluded that: (1) for IFR PP blends with varied ratios of Al2O3 and SiO2, the best performance always occurs at Si/Al=2.0; (2) chem. compn. seems to be of more significance than other factors, for instance, framework structure, porosity, etc.; (3) in mixt. of APP/PER/13X a dramatic change in Si/Al ratio was obsd. during heating (dealumineation may occur on heating); and (4) heavily oxidized states of Si and Al were found at higher temps.

Bibliographic Information

Elemental speciation by capillary electrophoresis -inductively coupled plasma mass spectrometry.     Horlick, Gary; Wang, Jianqi.    Department of Chemistry,  University of Alberta,  Edmonton,  AB,  Can.    Abstracts of Papers - American Chemical Society  (2000),  220th  ANYL-151.  CODEN: ACSRAL  ISSN: 0065-7727.  Journal; Meeting Abstract  written in English.    AN 2000:793516    CAPLUS   (Copyright 2004 ACS on SciFinder (R)) 

Abstract

Abstr. text not available.

Bibliographic Information

Application of HT-LOI method in study of flame retardant behavior of polymers.     Du, Jianxin; Han, Songqing; Xia, Juntao; Wang, Jianqi.    National Laboratory of Flame Retardant Materils, Institute of Chemical Engineering & Material Sciences,  Beijing University of Science and Technology,  Beijing,  Peop. Rep. China.    Zhongguo Suliao  (2000),  14(9),  53-57.  CODEN: ZHSUF5  ISSN: 1001-9278.  Journal  written in Chinese.    CAN 134:253005    AN 2000:761187    CAPLUS   (Copyright 2004 ACS on SciFinder (R)) 

Abstract

Temp. dependence of polyethylene, EVA, and systems thereof with additives, such as ATH and IFR is studied by oxygen index at elevated temp. (LOIT) and CONE calorimetry.  Influence of the content of VA in EVA on the flame retardance of EVA is probed.  Results show that the actual flame retardance of EVA copolymer or its flame retardant system may decrease.  LOIT is a practical method for evaluating the flame retardance of polymers.

Bibliographic Information

A comparative study of the effect of aluminosilicates on intumescent flame retardancy of PP/APP/PER systems by Cone/LOI/XPS.     Wang, Jianqi; Wei, Ping; Hao, Jianwei.    National Laboratory of Flame Retardant Materials, School of Chemical Engineering & Materials Science,  Beijing Institute of Technology,  Beijing,  Peop. Rep. China.    Polymeric Materials Science and Engineering  (2000),  83  61.  CODEN: PMSEDG  ISSN: 0743-0515.  Journal  written in English.    CAN 133:267519    AN 2000:565985    CAPLUS   (Copyright 2004 ACS on SciFinder (R)) 

Abstract

Limiting oxygen index results showed that the marked synergistic effect is usually true for each additive, i.e., Al2O3, SiO2, Al2O3-SiO2, zeolites (4A, 13X, ZSM 5), and montmorillonite in a similar way for polypropylene-ammonium polyphosphate-pentaerythritol intumescent flame retardant systems.  Aluminosilicates affected the degrdn. and charring of polypropylene system upon heating.  The binding energies of Si and Al within the system increased gradually by 2.2 eV and 2.3 eV, resp. with increasing temp., indicating the occurrence of heavily oxidized states of Si and Al at higher temps.

Bibliographic Information

Surface modification of PTFE by CH4/O2 plasma.     Chen, Xiaodong; Sun, Ruihuan; Wang, Jianqi.    China Rehabilitation Res. Center,  Beijing,  Peop. Rep. China.    Fushe Yanjiu Yu Fushe Gongyi Xuebao  (2000),  18(1),  25-29.  CODEN: FYYXEA  ISSN: 1000-3436.  Journal  written in Chinese.    CAN 133:253218    AN 2000:306675    CAPLUS   (Copyright 2004 ACS on SciFinder (R)) 

Abstract

Surface modification of polytetrafluoroethylene (PTFE) was carried out by CH4/O mixt. plasma.  It was found that surface hydrophilicity could be well improved under certain condition.  There existed three interacting reactions including plasma polymn., etching and oxidn. in the plasma treatment.  Etching caused a neg. effect on the hydrophilicity improvement of PTFE by mixt. plasma treatment.

Bibliographic Information

The electron-beam (EB) irradiation and grafting of acrylic monomers onto EPDM copolymer.     Zhang, Sheng; Wang, Jianqi; Ding, Yangbing; Wu, Shaoli; Xie, Liqing; Wen, Chenlin.    Beijing Engineering Plastics Alloy Technique Laboratory,  Beijing Institute of Chemical Engineering,  Beijing,  Peop. Rep. China.    Chinese Science Bulletin  (2000),  45(4),  322-325.  CODEN: CSBUEF  ISSN: 1001-6538.  Journal  written in English.    CAN 133:194387    AN 2000:299272    CAPLUS   (Copyright 2004 ACS on SciFinder (R)) 

Abstract

Radiation techniques (electron-beam, g-ray, etc.) are usually used for improving the compatibility between polymer and ingredients in composite materials.  Efforts were made to decline the flammability for EPDM polymer by EB technique and a remarkable redn. was attained through a series of treatments: pre-irradn., grafting, and sapon.

Bibliographic Information

Experimental design and optimization of the flame retarding EPDM formulation.     Li, Dinghua; Zhang, Chang; Wang, Jianqi; Zhao, Wenyuan.    National Laboratory of Flame Retarded Materials, College of Chemical Engineering & Materials Science,  Beijing Institute of Technology,  Beijing,  Peop. Rep. China.    Gaofenzi Cailiao Kexue Yu Gongcheng  (1999),  15(6),  171-175.  CODEN: GCKGEI  ISSN: 1000-7555.  Journal  written in Chinese.    CAN 132:123881    AN 1999:803526    CAPLUS   (Copyright 2004 ACS on SciFinder (R)) 

Abstract

The exptl. design and formulation optimization were for the halogen-free fire-resistant EPDM compds. obtained from melamine, silicone oil, aluminum hydroxide, ZnO, dicumyl peroxide, and EPDM rubber.  Mathematic models were established based on the optimization of four specifications which are limiting oxygen index, vol. elec. resistance, tensile strength, and elongation.  The model anal. showed results in fairly good agreement with the exptl. data as expected.

Bibliographic Information

Effects of magnetic field on the surface modification of PET by fluorocarbon plasmas II. Distributions of magnetic fields and their effects on the modification of PET.     Zhang, Liang; Wang, Jianqi; Hu, Jianfang.    Mesoscopic Physica Lab., Department of Physics,  Peking University,  Beijing,  Peop. Rep. China.    Gaofenzi Cailiao Kexue Yu Gongcheng  (1999),  15(6),  79-81.  CODEN: GCKGEI  ISSN: 1000-7555.  Journal  written in Chinese.    CAN 132:94086    AN 1999:803497    CAPLUS   (Copyright 2004 ACS on SciFinder (R)) 

Abstract

PET surface were modified by CF4 and CF4/CH4 plasmas in the presence of an magnetic fields.  The angle-dependent XPS technique was employed to det. the changes of surface structures and properties of the modified PET.  The effects of the magnetic field on the modification of PET by fluorocarbon plasmas were discussed.  The structures and properties of the modified PET surface depend on the molar ratio of the CF4/CH4 feed and the magnetic field strength, but not on the distributions of the magnetic fields.  A higher field strength resulted both a higher F/C ratio and the d.p. or etching.  

上一页  [1] [2] [3] [4] [5] [6] [7] [8]  下一页