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Polystyrene Segment (polystyrene + segment)

Distribution by Scientific Domains

Polymers and Materials Science	100%

Selected Abstracts

Polymer having a trithiocarbonate moiety in the main chain: Application to reversible addition,fragmentation chain transfer controlled thermal and photoinduced monomer insertion polymerizations

JOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 21 2006
Suguru Motokucho
Abstract A polymer having a trithiocarbonate moiety in its main chain was synthesized with a cyclic, five-membered dithiocarbonate as a building block. The trithiocarbonate in the polymer acted as a reversible addition,fragmentation chain transfer reagent to mediate a controlled insertion polymerization of styrene into the polymer main chain, giving the corresponding sequence-ordered polymer having a well-defined polystyrene segment in the main chain. During the polymerization, the polystyrene segment in the main chain gained its molecular weight, which maintained a linear relationship with the conversion of styrene. The insertion polymerization of styrene was induced not only thermally but also by ultraviolet irradiation. This photoinduced polymerization was well controlled by the trithiocarbonate moiety to give the corresponding polymer, whose structure was virtually the same as that obtained by the thermal polymerization. © 2006 Wiley Periodicals, Inc. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 6324,6331, 2006 [source]

Synthesis and Characterization of Thermally Curable Benzoxazine-Functionalized Polystyrene Macromonomers,

MACROMOLECULAR RAPID COMMUNICATIONS, Issue 10 2005
Baris Kiskan
Abstract Summary: Thermally curable benzoxazine ring-containing polystyrene macromonomers were synthesized and characterized. 1,4-Dibromo-2,5-bis(bromomethyl)benzene and 1,4-dibromo-2-(bromomethyl)benzene were used as initiators in the atom transfer radical polymerization of styrene. The resulting polymers were used in combination with 3-aminophenylboronic acid hemisulfate, for a Suzuki coupling. The obtained polymers, with amino groups in the middle or end of the chains, were reacted with formaldehyde and phenol to yield benzoxazine ring-containing macromonomers. In addition to the glass transition temperature of the polystyrene segment observed at ca. 105,°C, differential scanning calorimetry thermograms exhibit an exotherm at ca. 276,°C corresponding to the oxazine thermal polymerization. Both macromonomers undergo thermal curing with the formation of thermosets having polystyrene segments. Structure of the benzoxazine-functionalized polystyrene. [source]

Amphiphilic polymer conetworks prepared by controlled radical polymerization using a nitroxide cross-linker

JOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 19 2010
Weijie Zhao
Abstract Tandem atom transfer radical polymerization (ATRP) and nitroxide-mediated radical polymerization (NMRP) were used to synthesize a polystyrene- co -poly(acrylic acid) (poly(St- co -AA)) network, in which the two components were interconnected by covalent bond. First, a specific cross-linker, 1,4-bis(1,-(4,-acryloyloxy-2,,2,,6,,6,-tetramethylpiperidinyloxy)ethyl)benzene (di -AET), a bifunctional alkoxyamine possessing two acrylate groups, was copolymerized with tert -butyl acrylate through ATRP to prepare a precursor gel. The gel was then used to initiate the NMRP of styrene to prepare poly(St- co -(t -BA)) conetwork, in which the cross-linkages are composed of polystyrene segments. Finally, the poly(St- co -(t -BA)) conetwork was hydrolyzed to produce amphiphilic poly(St- co -AA) conetwork. The resulting gels show swelling ability in both organic solvent and water, which is characteristic of amphiphilic conetworks. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48: 4141,4149, 2010 [source]