China 
Africa 
Explore chapters and articles related to this topic
Polymers for Coatings for Plastics
Published in Rose A. Ryntz, Philip V. Yaneff, Coatings Of Polymers And Plastics, 2003
Polymer architecture is a term applied to describe forms of the polymer molecules. It describes a spatial form of the polymer molecules. Examples of polymer architecture already discussed are dispersed polymers versus solution polymers and block and graft copolymers. Polymer architecture also encompasses the form of segments built into the polymer backbone, such as rigid segments or flexiblizing segments. Branching, either as a random phenomena or as a particularly ordered structure, is a type of architecture that can be built into polymer molecules. Branching can lead to a lowering of polymer/polymer interactions and it can lead as a precursor to more network formation in a thermoset-ting system. When structural features of the polymer molecule are something more than a random joining of the segments (monomer units) making up the polymer, a form of architecture is developed. Star polymers (where a number of polymer chains radiate from a center point) and dendrimers (where a highly branched, but well-ordered structure is developed) are examples of polymer architecture that will lead to higher molecular weight at lower solution viscosity.
Role of each part of cyanobiphenyl-containing polymers in porous-film preparation by using the breath-figure method
Published in Liquid Crystals, 2020
Yumiko Naka, Lisa Nagashima, Hiromu Takayama, Khoa Van Le, Takeo Sasaki
A rough trend for molecular design could be said to exist based on the many reports about the formation of porous structures using various polymers [9]. In terms of polymer architecture, studies have reported that branching polymers [6,12] easily form regularly porous films compared with linear polymers. Phase separation and self-assembly induced by block copolymers promoted porous formation [13–15]. It has also been reported that the pore size can be controlled by changing the molecular weight of multi-arm star polymers from several thousands to a few million through living polymerisation [16]. In terms of the molecular structures of polymers, styrene-containing polymers have been widely considered for the fabrication of porous films [2,4,6,8,10–17]. The presence of polar groups in polymers is also an important factor for regularly ordered porous formation. Control of the porous morphology has also been reported based on the change in the chemical structures at the end of dendrimers [17]. The aforementioned studies showed that the selection and design of polymer plays a vital role in the formation of porous films by using the breath-figure method. Note that not all polymers form an ordered structure with the use of the breath-figure method.
Effects of molecular architecture of photoreactive phospholipid polymer on adsorption and reaction on substrate surface under aqueous condition
Published in Journal of Biomaterials Science, Polymer Edition, 2020
Kazuhiko Ishihara, Kohei Suzuki, Yuuki Inoue, Kyoko Fukazawa
Herein, we synthesized water-soluble photoreactive MPC polymers with benzophenone groups as the side chains. To control the polymer architecture, a living radical polymerization method was applied to the copolymerization of MPC and benzophenone methacrylates. The architectures of these polymers were linear polymers, polymers with hydrophobic terminals, and 4-armed star-like polymers, which promote adsorption on the surfaces.