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The Knitting-Pattern-Morphology in poly(styrene)-block-poly(ethylene-co-butylene)-block-poly(methylmethacrylate)

The topic of this work was the investigation of the stability and other properties of the so-called Knitting-Pattern-Morphology (“kp”) found in poly (styrene)-block-poly(ethylene-co-butylene)-block-poly(methylmethacrylate) (“SEBM”).

For this purpose non-hydrogenated tri-block copolymers systematically varied in the corre-sponding composition regime were produced via sequential anionic polymerization and sub-sequently hydrogenated to obtain the final SEBM polymer samples.

The required composition regime to obtain the kp-morphology was determined using samples prepared via the solution cast method. Furthermore a model was developed which could explain the morphological findings of TEM studies via a stepwise microphase separation mechanism. Together with the findings of the samples prepared via melt processing it was concluded that the kp-morphology was a metastable structure.

Since the kp-morphology could not be obtained via means of melt processing alone a com-bined approach of solution cast films being subsequently melt processed into specimen suited for a mechanical analysis yielded the kp-morphology also. This enabled the characterization of the morphology by different methods such as DSC, DMTA, fatigue crack propagation and tensile tests. The morphological characterization of the deformation and damaged zones was done in comparison to conventionally toughness modified materials such as ABS and PS-I and yielded a different behavior of the elastomeric phases which was subsequently discussed with regard to its causes.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author
 Harald Ott

Harald Ott
Arbeitsbereich Kunststoffe und Verbundwerkstoffe
Technische Universität Hamburg-Harburg

Information

Free keywords: Knitting, Pattern, Morphologie, Mikrophasenseparation, SEBM, ternäres, Tri-block, Blockcopolymer, Copolymer, sequentielle, anionische, Polymerisation, Struktur, Eigenschafts, Beziehung, TEM, Transmissionselektronenmikroskopie
Institute / chair: Arbeitsbereich Kunststoffe und Verbundwerkstoffe der Technischen Universität Hamburg-Harburg
Language: German
Technical consultant for expert services: Prof. Dr.-Ing. Volker Altstädt (Betreuer), Prof. Dr.-Ing. Karl Schulte, PD Dr. habil. Volker Abetz
Publication year: 2002
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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