SVIBOR - Project code: 2-15-038

MINISTRY OF SCIENCE AND TECHNOLOGY

Strossmayerov trg 4, HR - 10000 ZAGREB
tel.: +385 1 459 44 44, fax: +385 1 459 44 69
E-mail: ured@znanost.hr

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Project code: 2-15-038


FUNCTIONAL MONOMERS AND POLYMERS


Main researcher: JANOVIĆ, ZVONIMIR (18151)


Assistants
Type of research: applied
Duration from: 01/01/91. to 12/31/93.
Papers on project (total): 88
Papers on project quoted in Current Contents: 28
Institution name: Fakultet kemijskog inženjerstva i tehnologije, Zagreb (125)
Department/Institute: Petroleum Technology and Petrochemistry Physical Chemistry
Address: Marulićev trg 19
City: 10000 - Zagreb, Croatia
Communication
Phone: 385 (0)01-435-402
Fax: 385 (0)01-4550-725
Summary: Reaction mechanisms and kinetics of free radical copolymerization reactions of a series of prepared functional brominated monomers namely brominated phenylmaleimides, aliphatic acrylic ester and tribromstyrene with a number of conventional monomers like styrene, methyl acrylate, methyl methacrylate, acrylonitrile and vinyl acetate have been studied. In addition, some characteristic properties of copolymers obtained particularly the degree of polymerization, glass transition temperature, thermal stability and flammability behaviour were established. It was demonstrated that brominated N-phenylmaleimides give alternating placement with styrene and random with other monomers whereas the tribromstyrene gives only a statistical copolymers. The copolymers show considerable increase of thermal stability and appreciable flame-retardant properties. Change of molecular weight distribution of statistical poly(styrene-co- acrylonitriles) with composition using gel permeation measurements has been established. By means of dilute solution viscosity measurements, the compatibility of copolymers of halogenated styrene with poly(2,6-dimethyl-1,4-phenylene oxide) has been estimated. The change of molecular mass distribution during processing of poly(ethylenetherephthalate) filaments has been determined. The kinetic analysis of bulk polymerization between toluene diisocyanate and poly(oxypropylene)diol has been done as, well. Composite materials based on a polyurethane matrix and ammonium perchlorate filler were prepared and their rheological properties have been established. The dependence of rheological properties of an epoxy matrix, on curing conditions such as temperature, heating rate and reaction time, have been investigated as well. In addition, the complete thermal, rheological and dielectric characterization of an epoxy matrix for advanced composites has been undertaken.

Keywords: Copolymers, Brominated N-phenylmaleimides, Tribromstyrene, Poly(styrene-co-acrylonitrile), Polymer flammability, Epoxy chemoreology, Polyurethane composites, catalytic reforming

Research goals: The main objectives of the undertaken research was to examine the methods of preparing polymer materials with improved specific property. The two methods were used: a) by copolymerization reaction of various new synthetized monomers, particularly brominated monomers with a number of well known commercial available vinyl monomers, which led to an improvement of their thermal and the flame retardation properties of technically important polymers, and b) by preparing a suitable polymer-polymer mixtures or acomposite materials. As a functional monomers brominated N-phenilmaleimides, tribromophenyl acrylate and tribromostyrene were used and were copolymerized with styrene, methyl acrylate, methyl methacrylate, acrylonitrile and vinyl acetate. The mechanism and kinetics of copolymerization reaction were established and it was found that the retardation of flammability is linearly related to the bromine concentration in the copolymer. The viscosity behaviour of dilute solutions of poly(fluorostyrene-co-bromostyrene) and poly(2,6-dimethyl phenyl) oxide and their mixture were examined and the compatibility of polymer pairs were estimated. The composite propellents were prepared on the base of polyurethanes and ammonium perchlorate. Therefore, the kinetics analysis of bulk polymerization of toluene diisocianate and polyole, using different catalyst were established and than the relation between the viscosity, dynamic mechanical characteristics and partical dimensions and shape were obtained. The influence of the chemorheology of epoxy matrices on the processing behaviour of high performance composites were studied and the original models were developed to describe the kinetics of the polymerization reaction and matrix viscosity.

COOPERATION - INSTITUTIONS


  1. Name of institution: KEMIJSKI INŠTITUT
    Type of institution: University/Faculty
    Type of cooperation: Joint publishing of scientific papers
    City: 61000 - Ljubljana, Slovenija

  2. Name of institution: Institut "Ruđer Bošković"
    Type of institution: University/Faculty
    Type of cooperation: Joint publishing of scientific papers
    City: 10000 - Zagreb, Croatia

  3. Name of institution: INA-Razvoj i istraživanje
    Type of institution: University/Faculty
    Type of cooperation: Joint publishing of scientific papers
    City: 10000 - Zagreb, Croatia
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Last update: 10/13/95
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