Iranian Journal of Polymer Science and Technology / Volume 4 Number 1 (1995) 28                                                            ISSN: 1017-6020/1995

 

 

Synthesis and Properties of Novel Aliphatic‑Aromatic Polyamides

 

Containing Benzofluoranthene Linkage

 

S.E. Mallakpour and D. Hajiheidari

Organic Polymer Chemistry Research Laboratory, College of Chemistry, Isfahan University of Technology

Isfahan 84156, I.R. Iran

 

ABSTRACT

 

Novel aliphatic‑aromatic polyamides are synthesized via polycondensation reactions of 7,12‑dimethylcarboxylate benzo [k] fluoranthene with ethylenediamine, 1,3‑propylenediamine and 1,6‑hexamethylenediamine. Amidation of this diester is carried out by the melt technique. The resulted polyamides are characterized by spectroscopic methods. Some physical and thermal properties of these new polymers are studied and reported.

 


Iranian Journal of Polymer Science and Technology / Volume 4 Number 1 (1995) 1016                                                        ISSN: 1017-6020/1995

 

 

Kinetics of Ce4+/Sodium Sulphite Initiated

 

Polymerization of Acrylamide

 

A.K. Bajpai and S.K. Bajpai

Department of Chemistry, Government Autonomous Science College, Jabalpur (M.P.), India

 

ABSTRACT

 

The kinetics of the aqueous polymerization of acrylamide initiated by the redox pair Ce4+/sodium sulphite is studied under atmospheric oxygen at 250.2 C. The rate of polymerization is found to obey the equation:

 

Rpa [acrylamide]1.1 [Ce4+]1.5 [sodium sulphite]1.3

 

The effect of temperature, neutral salts, complexing agents and organic solvents on the course of polymerization is studied and numerical values of the Tudos parameter and retardation constants for retarders like organic solvents are evaluated. The energy of activation is calculated to be 6.90 kcal/mol from the Arrhenius plot.

 

 

Iranian Journal of Polymer Science and Technology / Volume 4 Number 1 (1995) 1825                                                        ISSN: 1017-6020/1995

 

 

Polymer‑Metal Complexes: Synthesis and Characterization

 

of Poly(2‑hydroxy-4‑acryloyloxy acetophenone‑

 

formaldehyde)‑Metal Complexes

 

T. Kaliyappan and P. Kannan

Department of Chemistry, College of Engineering, Anna University, Madras-600 025, India

A.V. Rami Reddy

Central Salt Marine Chemical Research Institute, Bhavnagar-364 002, India

 

ABSTRACT

 

2‑Hydroxy‑4‑acryloyloxy acetophenone formaldehyde (HAAF) macromonomer containing polymerizable vinyl group, prepared by condensing (1:1 mol ratio) 3‑hydroxy‑4‑acetyl phenylacrylate with formaldehyde in the presence of oxalic acid, is polymerized in methyl ethyl ketone at 70 C using benzoyl peroxide as initiator. Polychelates are obtained when the DMF solution of PHAAF containing a few drops of ammonia is treated with the aqueous solution of Cu (Il)/Ni (II). Elemental analysis of the polychelates indicates a metal‑ligand ratio of 1:2. The IR spectral data of polychelates indicate that the metals are coordinated through the oxygen of the keto group and oxygen of the phenolic‑OH group. The diffuse reflectance spectra and magnetic moments of polychelates indicate an octahedral and square planar, respectively. X‑Ray diffraction studies reveal a high crystalline nature of polychelates. The intrinsic viscosity and the thermal properties of polymer and metal complexes are discussed.

 


Iranian Journal of Polymer Science and Technology / Volume 4 Number 1 (1995) 2632                                                        ISSN: 1017-6020/1995

 

 

In‑situ Electrical Measurements of Conductive‑Electroactive

 

Polymers During their Redox Processes: A Case Study of

 

Polypyrrole/p‑Toluene Sulphonic Acid

 

A. Talaie

Department of Chemistry, University of Wollongong, Wollongong NSW 2522, Australia

 

ABSTRACT

 

Cyclic resistometry, CR, is an in‑situ resistance measurement which is applied during the electrosynthesis of polypyrrole/p toluene sulfonate and also subsequent to polymer growth. The resistance changes during cyclic voltammetry of the PPY/PTS characterize the effect of polymerization and post‑polymerization conditions.

 


Iranian Journal of Polymer Science and Technology / Volume 4 Number 1 (1995) 3440                                                        ISSN: 1017-6020/1995

 

 

Polymer Colloids

 

Z. Tuzar

Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, 16206 Prague 6, Czech Republic

 

ABSTRACT

 

Polymer colloids cover a broad spectrum of polymeric materials like macrolattices, microlattices, polymeric membranes, etc. The most important polymer colloids are block and graft copolymer micelles which represent a specific state of polymeric matter with a number of interesting structural features and properties. In this paper, recent development in the field of polymeric micelles is discussed, namely, problems of micelle formation, micelle structure, hydrodynamic properties, micellar equilibria, and solubilization.

 


Iranian Journal of Polymer Science and Technology / Volume 4 Number 1 (1995) 4250                                                        ISSN: 1017-6020/1995

 

 

On the Ritter Synthesis of N‑tert‑Butylacrylamide (Part II):

 

Reaction Between tert‑Butylalcohol and Acrylonitrile in

 

Non‑aqueous Solvents

 

D. Dragan

Petru Poni Institute of Macromolecular Chemistry, Jassy, Romania

 

ABSTRACT

 

The Ritter reaction between tert‑butylalcohol and acrylonitrile with sulfuric acid as catalyst in excess anhydrous acetic acid or acrylonitrile is investigated. A somewhat different course of reaction as with isobutylene was found. High yields of N‑tert‑butylacrylamide with 80‑98 % sulfuric acid at mild temperatures could be obtained but a partial sulfonation of the amide with concentrated or fuming sulfuric acid at higher temperatures was established. A kinetic study of the amide formation is carried out.

 


Iranian Journal of Polymer Science and Technology / Volume 4 Number 1 (1995) 5055                                                        ISSN: 1017-6020/1995

 

 

The Development and Application of Shear Controlled

 

Orientation Technology

 

P.S. Allan, M.J. Bevis and A. Zadhoush

Wolfson Centre for Materials Processing, Brunel University, Uxbridge, Middlesex, UK

 

ABSTRACT

 

The application of specified macroscopic shears during the solidification of polymer melts provides a route for the development of preferred orientation of polymer molecules and reinforcing fibres in solid polymer and polymer matrix composite extrudate and mouldings. Shear controlled orientation technology (SCORTEC) also provides a route for the elimination of internal weld lines, sinking and other processing defects. The basic technology will be described with respect to microstructure control in moulding (SCORIM), in continuous extrusion (SCOREX), and a new method for the production of curvilinear extruded profile (SCORBEND). One example of (SCORTEC) is described in more detail and is based on the production of defect‑free mouldings in glass fibre reinforced polypropylene containing a thick section remote from the feed gate.

 


Iranian Journal of Polymer Science and Technology / Volume 4 Number 1 (1995) 5663                                                        ISSN: 1017-6020/1995

 

 

Tensile and Flexural Behaviour of Fibre Reinforced

 

Cementitious Composites

 

M. Razavi Nouri and J. Morshedian

Polymer Research Center of Iran, Tehran, I.R. Iran

 

ABSTRACT

 

An experimental study about the effect of fibres on the mechanical behaviour of fibre reinforced cementitious samples in tension and flexure is reported. Cementitious samples contain varying amounts of E‑glass, Dolanit 10 and Dolanit 11 fibres. Results show that flexural and tensile strengths as well as toughness and ductility of fibre reinforced cement increased considerably with respect to that of cement alone. While the properties enhanced with time for PAN reinforced samples, properties of glass reinforced cementitious samples degraded with time. An empirical model is used to represent the test data.

 


Iranian Journal of Polymer Science and Technology / Volume 4 Number 1 (1995) 6470                                                        ISSN: 1017-6020/1995

 

 

New Poly(vinyl chloride)‑Based Blends:

 

Aspects of Processability (Part II)

 

M. Rusu

Department of Macromolecules, Polytechnic University of Jassy, Romania

M. Dan Bucevschi

Department of Leather and Substitutes, Polytechnic University of Jassy, Romania

F. Petraru and L. Gramescu

S.C. CEPROPLAST S.A., Jassy, Romania

 

ABSTRACT

 

Starting from the characteristics of the parameters specific to Brabender plastograms, the concurrent influence of the nature and ratio of some impact modifiers, of the processing aid ratio and of the carbon black upon the fusion and lubricating characteristics of some PVC‑ based unplasticized compounds has been evaluated. There has been also put into evidence the anti‑lubricating action of the above components, the intensity of which depends on their ratio in the blends composition.

 


Iranian Journal of Polymer Science and Technology / Volume 4 Number 1 (1995) 7276                                                        ISSN: 1017-6020/1995

 

 

Interpenetrating Polymer Networks Based on Liquid Natural

 

Rubber (Part II): Effect of Weight Composition and

 

Crosslink Level of the Polystyrene Component

 

V.B. Pillai and D.J. Francis

Dept. of Polymer Science and Rubber Technology, Cochin university of Science and Technology, Cochin 682022, India

 

ABSTRACT

 

According to a previously established general synthesis technique, polyurethane‑polystyrene full interpenetrating polymer networks with various weight compositions and crosslink levels in polystyrene network are prepared. The effect of the crosslink level of the polystyrene network on the physical and mechanical properties is examined. It is seen that the IPNs exhibit an increasing trend in density and shore‑A hardness tensile strength with an increase in polystyrene content, as well as with an increase in crosslink level, while the elongation at break decreased for a similar variation. Crosslink density studies of this type of full IPNs also indicate a phase inversion.