Microstructural and morphological control in emulsion copolymerizations

A.M. Herk, van, M.L.H. Pepers, M. Jung

Research output: Contribution to journalMeeting AbstractAcademic

Abstract

Process strategies have been developed to obtain homogeneous copolymers or copolymers of well-defined heterogeneity. It was shown that copolymers with the same av. chem. compn. but different CCDs show dramatic differences in mech. properties. Online Raman spectroscopy has proven to be a valuable tool in controlling mol. microstructure and (non-equil.) morphologies. Our group has significantly contributed to the development of techniques to det. kinetic parameters like the propagation rate consts. (kp), the (chain length dependent) termination rate consts. (k1) and the transfer rate consts. (ktr). The pulsed laser polymn. technique is very suitable to obtain accurate propagation rate consts. in homogeneous systems. Pulses of radicals (through light or electron beam) can also be used to obtain the local monomer concn. in for example latexes and vesicles. The replacement of conventional chain transfer agents by catalytic chain transfer agents in emulsion polymn. is under investigation. Through electron beam initiation optically transparent latexes have been prepd. without high levels of surfactant as normally necessary. The bio-optical applications of these latexes are currently under investigation together with the biomedical industry. Twin-tailed surfactants can form vesicles and our group succeeded for the first time in performing polymn. in these vesicle bilayers, by swelling them in a controlled manner with monomers like styrene, followed by polymn. using photoinitiators. Special techniques (like cryo-TEM) have been used to confirm the formation and morphol. of (polymd.) vesicles. It was shown that phase sepn. is very difficult to prevent. However, the phase sepn. phenomena lead to many interesting new morphologies and corresponding phys. properties. [on SciFinder (R)]
Original languageEnglish
Pages (from-to)499-
Number of pages1
JournalPMSE Preprints
Volume87
Publication statusPublished - 2002

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    Herk, van, A. M., Pepers, M. L. H., & Jung, M. (2002). Microstructural and morphological control in emulsion copolymerizations. PMSE Preprints, 87, 499-.