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Chloroprene Copolymer Rubbers and Latexes

#A-704


Synthesis of New Different Functional Groups-Containing Chloroprene Copolymer Rubbers and Latexes and Composites on their Basis

Tech Area / Field

  • CHE-POL/Polymer Chemistry/Chemistry
  • CHE-IND/Industrial Chemistry and Chemical Process Engineering/Chemistry
  • CHE-SYN/Basic and Synthetic Chemistry/Chemistry

Status
3 Approved without Funding

Registration date
22.03.2001

Leading Institute
NPO Nairit, Armenia, Yerevan

Supporting institutes

  • Yerevan State University, Armenia, Yerevan

Collaborators

  • State University of New York University at Buffalo, USA, NY, Buffalo\nUniversite Montpellier / Laboratoire d'Etude des Materiauux Polymeres, France, Montpellier

Project summary

Project option is to develop recipes and production technologies of new latexes and rubbers of chloroprene copolymers containing various functional groups (carboxyl, ester, amine, hydroxyl) and possessing combined specific properties. They can be designed for use in a number of fields (mechanical, rubber goods, cable, light industries, in manufacture of lacquers and paints, construction engineering etc).

Chloroprene emulsion copolymerization with addition of small quantities of comonomers containing various functional groups allows to produce polymeric materials of designed characteristics: increased adhesive affinity to different substrates and surfaces, oil-petrol, heat – and cold – resistance, incombustibility, biological activity which are due to the presence of functional groups in the macromolecular chain as well as to three-dimensional (cross-linked) structure formation ability as a result of intermolecular reactions. It should be added that up to date counterparts of structurized chloroprene rubbers have low strength characteristics (conventional tensile strength Ј 10 MPa, elongation at break – 500-600%) and as a rule they can be only used as additives in combination with other chloroprene rubber grades in rubber compositions.

Research work carried out at Nairit SPCSC and Yerevan State University give basis to state that copolymerization of chloroprene with small quantities of comonomers containing various functional groups (carboxyl, ester, amine, hydroxyl) could produce copolymers with unique properties (including high physico-mechanical characteristics, adhesion, chemical resistance in superaggressive media, heat resistance etc.).

It should be accentuated that due to the above properties copolymers produced will be used not only in combination with other polymeric materials but also alone. The functional group content in chloroprene copolymer chains will be varied in the range of 0.2 to 5.0 mass % depending upon their nature. For purposeful synthesis of new chloroprene copolymer rubbers and latexes (meth)acrylic, maleic, cumaric and itaconic acids, maleic and phthaleic anhydrides, maleic and phthaleic imides, dimethacrylate-(tris)-ethylene glycol, dimethyl aminoethyl methacrylate and acryl amido – tri oxymethyl methane will be used as comonomers containing different functional groups.

In the frame of the Project realization it is assumed to carry out fundamental research in order to study kinetics and mechanism of chlroprene copolymerization process with the aim to provide scientific prerequisites for the development of recipes and technologies for the purposeful synthesis of new chloroprene rubbers and latexes containing the above mentioned functional groups.

The physico-chemical and physico-mechanical properties of obtained copolymer samples must be studied in detail which will help to predetermine their application fields. Pilot and industrial testing of elaborated recipes and manufacturing process of new copolymer rubbers and latexes will be carried out. The purposeful development of new composites on the basis of synthesized copolymers is planned.

The Project will be fulfilled by highly skilled specialists – chemists, engineers and physicists. The personal group consists of specialists with higher education including doctors of science and candidates (PhD).

The suggested Project is a fundamental research with evident practical applied tendency. New chloroprene copolymer rubbers and latexes produced with high adhesion characteristics, heat and cold resistance and a combination of physico-mechanical and performance characteristics will find their application in various industry branches:

– manufacture of rubber industrial goods by an ionic deposition method (acid and alkali resistant protective gloves, radio zonde shells etc), impregnating compositions for rubber cords;


– finishing materials for manufacture of genuine and artificial leathers and furs;
– as adhesive compositions in ligth, rubber industrial goods, woodworking and furniture industries, in construction engineering;
– water-dispersible paints, anticorrosive and protective coatings;
– composites(rubber mixtures) for rubber industrial goods, cable, tire and other adjacent branches of industry.

The Project will give an opportunity to a large group of specialists and scientists earlier involved in armament technology to reorient their abilities and efforts to research work pursuing peaceful purposes. The object of integration of these scientists into international scientist association by cooperation with foreign collaborators,joint publications of research results in open press and participation in international meetings will be achieved. The support of the Project is completely in accordance with ISTC object ives.

Project activities volume consists of comprehensive study of kinetics and mechanism of emulsion copolymerization of chloroprene with small additives of the above mentioned comonomers as well as physico-chemical, physico-mechanical and performance characteristics of produced copolymeric latexes and rubbers and compositions on their basis. The tasks of the Project will be fulfilled through cooperation of participating scientists of different professions.

It is assumed to accomplish intensive cooperation of the Project participants with foreign collaborators – specialists from Department of Chemical Engineering, New York State University (Buffalo, USA) and from Laboratory of Polymeric Materials University Montpellier 2 (France) for carrying out joint study on synthesis, physico-chemical and physico-mechanical properties of synthesized copolymers, more precise definition of their application fields.

A complex approach will be used to solve the tasks of the Project including various kinetic, physico-chemical research and physico-mechanical testing methods. Synthesis of chloroprene copolymer latexes and rubbers will be carried out by emulsion method. Copolymerization process kinetics will be studied by dilatometry and densimetry methods. The effect of various parameters such as nature and concentration of comonomers, emulsifiers, additives (ingredients) and temperature, on copolymerization rate and mechanism will be investigated.

Physico-chemical properties and molecular characteristics of synthesized latexes and rubbers will be studied by spectrometry, surface tension, conductometry, dielcometry, thermogravimetry, viscosimetry, light scattering, turbidimetric titration, magnetic resonance methods.

Physico-mechanical characteristics of latex films and rubbers as well obtained samples will be studied by routine or specially developed methods.


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ISTC facilitates international science projects and assists the global scientific and business community to source and engage with CIS and Georgian institutes that develop or possess an excellence of scientific know-how.

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