Chain folding polymers
WebApr 5, 2012 · Well-defined synthetic single polymer chains with a functionality that can enable a folding process may be generated by combining controlled/living polymerization (CLP) techniques 6 with … WebPolymer chains with different conformations in crystalline and amorphous regions are described by rigid rod chains and flexible Gaussian chains, …
Chain folding polymers
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WebPolymer chains interact to form a bulk polymer. The configuration of this interaction can be either amorphous or crystalline (Fig. 8.6 ). The amorphous (non-crystalline) configuration refers to a random arrangement of neighbouring polymer chains. For interest, all polymers are amorphous at sufficiently high temperature, or when in solution. WebJan 1, 2011 · Poly(bisphenol‐A‐etheralkane), BA‐Cn(n, which is the number of aliphatic CH2 units, = 8 and 10), composed of rigid and flexible segments, is a semicrystalline polymer. In 50‐nm‐thick films, the polymers tend to develop flat‐on lamellae at the surfaces. Principal component analyses (PCAs) of the ion images were used to discriminate the …
WebNov 30, 2003 · Therefore, it may be concluded that propyl branches also act as 'folding controllers', helping the chains to fold during melt crystallization. The present study demonstrates that the morphology... WebA unique approach using 13C–13C double quantum (DQ) NMR combined with selective 13C isotope labeling is proposed to investigate the chain trajectory of the synthetic polymer in bulk crystals. Since the DQ buildup curve highly depends upon coupled spin number, topology, and internuclear distance, which originated from the chain trajectory of …
WebA calculation of the radial growth of polymer spherulites is given for four models. These concern growth where the surface nuclei that control the rate are (1) bundlelike and coherent, (2) chain folded and coherent, (3) chain folded and noncoherent, and (4) bundlelike and noncoherent. The required modifications of nucleation theory are given. WebAug 26, 2008 · The essential factor controlling the formation of chain folded polymer crystals is attributed to the statistical distribution of many subcritical nuclei pre‐existing …
WebFeb 8, 2024 · As results, it is found that glassy chains adopt the same adjacent re-entry structure (adjacent re-entry number, n = 1) with the melt- and cold-grown crystals. From these results, it is concluded that (i) folding occurs prior to crystallization and (ii) melt and cold crystallization do not induce additional folding but proceed with ...
WebThe advances carried out in recent years in the folding of single polymer chains into discrete SCNPs via multi-orthogonal interactions using different reactive chemical … dcshg jessicaWebthe problem of molecular orientation in polymer spherulites, journal of polymer science 17: 351 (1955). Google Scholar KELLER, A, A NOTE ON SINGLE CRYSTALS IN POLYMERS - EVIDENCE FOR A FOLDED CHAIN CONFIGURATION, PHILOSOPHICAL MAGAZINE 2 : 1171 … geha health rewards storeWebAug 22, 2024 · Another class of models describes a “postinformational” heteropolymer world, in which there is already some tendency of chains to evolve. In one such model, it … geha health rewards balanceWebIt is concluded that lamellar spherulites consist largely of chain folded structures. The factors that could cause chain folded crystals to appear in profusion in bulk polymers … dcshg heightsWebJan 15, 2014 · Detailed structural and chain-folding characterization has revealed: single-chain folding is favored with the RMA content 20–40 mol % per chain; the hydrophobic inner compartment (or the self-folded structure) is stable even at a high polymer concentration (up to ∼6 wt %); and folded–unfolded transition occurs on addition of … dcshg 2022WebMar 1, 1987 · Polymer crystals are characteristically thin in the molecular direction 1 so that materials such as polyethylene and nylon have an extremely finely divided texture … geha health rewards contactWebApr 14, 2024 · This was due to the flexible propylene linkers in the polymer chains. ... Folding-driven reversible polymerization of oligo(m-phenylene ethylene) imines: Solvent and starter sequence studies ... geha health rewards reddit