Iranian Journal of Polymer Science and Technology / Volume 3 Number 1 (1994) 212 ISSN: 1017-6020/1994
New Synthesis Method of Polythiophenes
A. Dadras Marani and A.A. Entezami
Polymer Lab., College of Chemistry, University of Tabriz, Tabriz, I.R. Iran
We report a new procedure for preparation of poly(thiophene), poly(3‑methylthiophene), poly(2,2'‑bithiophene), cross‑linked poly(2-vinylthiophene), poly[(2,2'‑dithienyl)‑5‑5'‑diylvinylene], poly[(3,3'‑dithienyl)5,5'‑diylvinylene], poly[(1,2‑dimethyl‑2,2'‑ dithienyl)‑5,5'‑diylvinylene], and poly[(3,4‑dimethyl‑1,3,5‑hexatriene‑1,6‑diyl)bisthiophene] films, where the monomer is polymerized at an interface. Polymeric films are prepared at room temperature by contact between an aqueous solution of HCIO4 9.1 M containing Fe(CIO4)3, 9H2O as an oxidant and monomer solution in benzene under N2 atmosphere. Four‑probe electrical conductivity data measured on compressed pellets of the polymers show, 2.5E‑3, 1.5, 8, 1.0E‑5, 12, insulating, 1.2E‑2, 4E‑4 Scm1, respectively. The FT‑IR spectrum of the polymers has been discussed.
Iranian Journal of Polymer Science and Technology / Volume 3 Number 1 (1994) 1319 ISSN: 1017-6020/1994
Synthesis, Spectral and Thermal Studies of
P. Kannan, S. Umadevi, V. Krishnasamy, C.S. Swaminathan
Department of Chemistry, College of Engineering, Anna University, Madras, India
Ferrocenylenearyl polyesters are synthesized by the reaction of 1,1'‑bis (chloroformyl) ferrocene with various aromatic diols by interfacial polycondensation using a phase transfer catalyst. The polymers are characterized by infrared, the 1H‑NMR and 13C‑NMR spectroscopy. The molar mass is investigated by measuring the inherent viscosity. The thermal stability of the polymers is determined by thermogravimetry. The thermogravimetric analysis shows that all the polymers are stable up to 250‑355 °C in nitrogen. Amongst the ten polymers, phenolphthalein and tetraphenylthiophene based polymers exhibit higher thermal stability than that of others.
Iranian Journal of Polymer Science and Technology / Volume 3 Number 1 (1994) 2029 ISSN: 1017-6020/1994
Toughness and Ductility of Fibre Reinforced Cementitious
Composites in Flexure
J. Morshedian and M. Razavi Nouri
Polymer Research Center of Iran, Tehran, I.R. Iran
An experimental and theoretical study of the post‑cracking behaviour and ductility of fibre reinforced cementitious beams in flexure is reported. Flexural loading tests have been conducted on notched beams containing varying amounts of E‑glass,Dolanrt 10 and 11 fibres ( Hoechst Polyacrylonitrile Fiber Products). The test data were analyzed to evaluate the effect of fibre type and fibre volume on the toughness and ductility of fibre‑reinforced cementitious composites. A theoretical model has been proposed and found to fit the test data appropriately.
Iranian Journal of Polymer Science and Technology / Volume 3 Number 1 (1994) 30 37 ISSN: 1017-6020/1994
The Synthesis of Alkyl‑Phosphates for Fibres Antistatic
Treatment: Mathematical Modelling of the Process
V. Nicu, C. Teodosiu
Department of Chemical Engineering, Technical University of Iassy, Iassy, Romania
Mathematical Faculty, University of Iassy, Iassy, Romania
N. Aelenei, C. Beldie and A. Onu
Department of Physical Chemistry, Technical University of Iassy, Iassy, Romania
The alkyl phosphates synthesis for the realization of fibres antistatic substances, is carried out by phosphatizing fatty saturated alcohols (fraction C16C18) with POCl3 or PCI3. The reaction is conducted in a semicontinuous reactor. The non‑isothermal thermokinetic method is used for the kinetic study. An original reaction cell and electronic dispositive are used for the kinetic curves registration. A second order reaction for the phosphatizing process is established by thermokinetic curves processing. The activation energy and frequency factor are determined.
Iranian Journal of Polymer Science and Technology / Volume 3 Number 1 (1994) 3847 ISSN: 1017-6020/1994
Exact Determination of the Critical Exponents of Kinetic Self‑
Avoiding Random Walks on Four Simplex Fractals (I)
M.A. Jafarizadeh and S.K. Seyed‑Yagoobi
Department of Physics, University of Tabriz, Tabriz 51664, I.R. Iran
By using real space renormalization technique we derive nonlinear coupled equations for the generating functions of the walk in a three dimensional fractal. We use Newton's method to solve these equations numerically and show that the value of n is equal to 0.6741596 and that of the connectivity constants m is 2.526559.
Iranian Journal of Polymer Science and Technology / Volume 3 Number 1 (1994) 4859 ISSN: 1017-6020/1994
Hexamethylene‑N,N΄ bis (tert‑butyl peroxycarbamate) as
Crosslinking Agent in Some Elastomers
Department of Chemistry, University of Ilorin, Ilorin, Nigeria
Institute of Polymer Technology and Materials Engineering, University of Technology, Loughborough, UK
The use of hexamethylene‑N,N' bis (tert‑butyl peroxycarbamate) (HBTBP) as a crosslinking agent in natural rubber and fluoroelastomers has been reported earlier. This paper reports the results of the technological evaluation of this crosslinking agent in other elastomers. Using the Monsanto Oscillating Disc Rheometer, it is found that HBTBP will crosslink nitrile rubber, styrene‑butadiene rubber, silicone rubber, polychloroprene and epichlorohydrin rubber. However, HBTBP is not found suitable as a crosslinker for chlorosulphonated polyethylene and ethylene‑propylene diene terpolymer.
Iranian Journal of Polymer Science and Technology / Volume 3 Number 1 (1994) 60 71 ISSN: 1017-6020/1994
Simulation of Post‑Cure Inflation Process of Tires (I)
Study of Tire Cord Thermoelastic Characteristics
The Iran Tyre Manufacturing Company, Tehran, I.R. Iran
Not only does the process of tire post‑cure play an important role in the production of a tire plant, but it has a great impact on tire performance and its operational characteristics. In this paper initially, a series of mastercurves for tire cord stress/strain relationships at different temperatures are generated and then these relations are presented in this form of empirical equations. Nylon 6 with 1680/2 denier has been tested and its thermoplastic behaviour has been studied. Furthermore, a comparison in the physico/mechanical properties of these cords at two conditions (posted and nonposted) is made. In the last stage, laboratory experimental test results for mentioned cords are compared with the actual test results in a tire and an analysis is made on the physical/mechanical properties of the cords used in the tires for the posted and nonposted conditions.
Iranian Journal of Polymer Science and Technology / Volume 3 Number 1 (1994) 7278 ISSN: 1017-6020/1994
Kinetic Study of the Dimethylcyclosiloxanes
M. Cazacu, M. Marcu, S. Lazarescu and M. Simionescu
Petru Poni Institute of Macromolecular Chemistry, Iassi, Romania
Polytechnic Institute of Iassy, Faculty of Industrial Chemistry, Iassi, Romania
The polymerization of dimethylcyclosiloxanes mixture is carried out using a styrene‑divinylbenzene copolymer with sulphonic groups catalyst (Vionit CS 34C). The conversion versus time function is studied at different temperatures. It is found that the reaction is first order towards monomer.