The molecular weight increased from the first stage to the third stage, proving the formation of block copolymer
. The experimental [bar.[M.sub.n]] s deviated from theoretical values, which could be ascribed to the following two reasons: the polarity difference between polymers and polystyrene standard; branched molecular structure formed during the polymerization of BA [32-34].
Murakami, "A free-standing, sheet-shaped, "hydrophobic" biomaterial containing polymeric micelles formed from poly(ethylene glycol)-poly(lactic acid) block copolymer
for possible incorporation/release of "hydrophilic" compounds," Colloids and Surfaces B: Biointerfaces, vol.
Burt, "A review of the formation and classification of amphiphilic block copolymer
nanoparticulate structures: micelles, nanospheres, nanocapsules and polymersomes," European Journal of Pharmaceutics and Biopharmaceutics, vol.
Hypermer B246, is an ABA block copolymer
of polyhydroxystearic acidpolyethylene oxide-polyhydroxystearic acid.
The block copolymers
can be difficult to disperse in thermosets such as epoxy and are often supplied as masterbatches in epoxy.
SBS was followed by HSBC (Hydrogenated Styrenic Block Copolymers
) which accounted for 13.2 percent of total market volume in 2013.
Zhao, "Photo-responsive block copolymer
micelles: design and behavior," Chemical Society Reviews, vol.
The nature and strength of the interfacial interactions at the asymmetric interfaces (block/solid and block/air interface) significantly influence the block copolymer
thin film morphology, phase separation, and orientation of microstructures.
(NYSE: KRA), a producer of styrenic block copolymers
, has executed a framework agreement with Formosa Petrochemical Corporation, a petrochemicals and plastics manufacturer.
Ting Xu, a polymer scientist who led this project, believes that a better approach is to use block copolymers
- long sequences or "blocks" of one type of monomer molecule bound to blocks of another type of monomer molecule.
* Block copolymer
technology that yields elastomers which provides a true altemafive to styrenic block copolymer
He has developed an approach that involves mixing concentrated hydrochloric acid with titanium ethoxide, ethanol, and Pluronic[R] P123 (a block copolymer
surfactant manufactured by BASF) to create a mesoporous titania film (the "meso-" prefix refers to pores of 2-50 nanometers in diameter).