Morphology of Isotactic Polypropylene–Polyethylene Block Copolymers Driven by Controlled Crystallization

Control of Barite Morphology by Double-Hydrophilic Block Copolymers

Barite particles with a rich variety of well-defined morphologies have been synthesized by using double-hydrophilic block copolymers (which consist of a hydrophilic solvating block and a hydrophilic binding block) as crystal growth modifiers to direct the controlled precipitation of barium sulfate from aqueous solution. The influences of variation in functional group and molecular structure of ...

Morphology-controlled growth of perylene derivative induced by double-hydrophilic block copolymers

Morphology-controlled growth of perylene derivative induced by double-hydrophilic block copolymers Minghua Huang,1,2 Markus Antonietti,2 and Helmut Cölfen2,3,a 1Institute of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China 2Colloid Chemistry, Max-Planck-Institute of Colloids and Interfaces, Research Campus Golm, D-14424 Potsdam, Germany 3Physical Chemistry, Un...

C selectivity in the crystallization - driven self - assembly of polylactide block copolymers †

Redox-controlled micellization of organometallic block copolymers.

Polystyrene-block-polyferrocenylsilane (PS-b-PFS) diblock copolymers were stoichiometrically oxidized in solution using salts of the one-electron oxidant tris(4-bromophenyl)ammoniumyl. Due to a redox-induced polarity change for the PFS block, self-assembly into well-defined spherical micelles occurs. The micelles are composed of a core of partially oxidized PFS segments and a corona of PS. When...

Extensional-flow-induced crystallization of isotactic polypropylene

A filament stretching extensional rheometer with a custom-built oven was used to investigate the effect of uniaxial flow on the crystallization of polypropylene. Prior to stretching, samples were heated to a temperature well above the melt temperature to erase their thermal and mechanical histories and the Janeschitz-Kriegl protocol was applied. The samples were stretched at extension rates in ...