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NEW LIQUID CRYSTAL POLYMER/ELASTOMER COMPOSITES

Objectif

The programme is designed to verify the possibility of using Liquid Crystal Polymers (LCPs) both as processing aids and reinforcing agents of conventional elastomers.
Blends of technical articles were obtained by compounding LCPs and fluoroelastomers (FE).
1) Qualitative and quantitative information on processing aid effect of different LCPs structures, when blended with different elastomers, were achieved: viscosity of melt blends is constantly much lower than that of FE alone; semirigid LCPs gave the best results.
2) Achievements of self reinforcing composite does not depend on the production of fibrillar LCPs species: excellent reinforcement were obtained probably due to a reaction between LCPs and FEs.
3) A promising prospect exists for the generation of new composite materials which possess cost/performance better than FEs alone.

Blends for tyre compounds were studied.
1) Both qualitative and quantitative information on processing aid effect of different LCPs structures, when blended with natural rubber and SBR has been obtained; clearly the addition of LCPs in the compounds results in a significant decrease in the measured viscosity of the compounds (advantage: reduction of energy consumption during the fabrication of rubber goods).
2) This study has shown that LCP fibers can be formed in the rubber matrix during the extrusion process and the mechanical properties of the LCP/rubber compounds can be improved through the formation of in-situ fibers into the matrix. However more work needs to be carried out again. In fact, in this study, temperatures much higher than the typical processing temperatures were used in the extrusion of the LCP containing rubber compounds (namely SBR and natural rubber) and higher level of antidegradants and less active accelerators had to be used in order to prevent excessive oxidation and early scorch of the compounds during the extrusion process.
The main goals are:
-the creation of reinforcing species in the elastomeric matrix during processing by taking advantage of the fibrous morphology of LCPs
-the use of mild processing conditions due to the low viscosity of LCPs, by saving energy while avoiding possible damage of products and machines
-the production of satisfactory adhesion between reinforcing species and elastomeric matrices, and consequently, out standing performances in comparison with conventionally reinforced elastomers.

Intermediate goals are:
-synthesis of tailored structures of LCPs
-design of machines for a proper processing of LCPs and elastomers
-development of optimal processing conditions
-evaluation of the new materials performances in pneumatic tyre prototypes and in technical articles.

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Coordinateur

Eniricerche SpA
Contribution de l’UE
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Adresse
Via Felice Maritano 26
20097 San Donato Milanese
Italie

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