Organic Liquids as Blowing Agents for Blend Systems of Amorphous Thermoplastic Resins
Increasing requirements on polymeric foams lead to matrix systems with increasing complex-ity out of miscible and immiscible polymers. In special polymers with hugh difference in pro-cessing parameters, as rheological properties, lead to special requirements concerning the foaming process as well as the blowing agent selection. High viscous blend phases are able to improve nucleation behavior of the low viscous phase, but simultaneous foaming of both phases is challenging. The high viscous phase shows no or only partial foaming due to the higher resistance against deformation. Choosing the right blowing agent or combination of blowing agents allows foaming both or especially the high viscous phase. The transfer of stresses is another challenge of immiscible blend systems. Due to immiscibility stress cannot be perfectly transferred from one phase to the other. To overcome this issue, immiscible blend systems are generally compatibilized, increasing the complexity of the matrix phase.
Therefore the aim of the work is to control the foaming behavior of the blend phases taking immiscible and compatibilized blend systems out of PPE, PS and a triblockterpolymer (PS-b-PB-b-PMMA) as example. To select the blowing agents, first, the interaction between the blowing agents and the blend phases is calculated and verified by analyzing the transport properties of the blowing agent/blend phase combinations. Afterwards, the plasticization of the blend phases by the blowing agents is calculated and the foaming behavior of the neat polymers as well as the immiscible blend systems evaluated. Finally a selective foaming of the blend phases of the immiscible blend systems could be proofed combining blowing agents to blowing agent systems.Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Foam, blend, blowing agent, organic liquid
Institute / chair: Fakultät für Angewandte Naturwissenschaften der Universität Bayreuth
Technical consultant for expert services: Prof. Dr.-Ing. Volker Altstädt (Betreuer), Dr. Alex Müller
Publication year: 2011
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de
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