Chain folding polymers

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August undefined, 2024

WebFeb 8, 2024 · There are long-standing debates in crystallization mechanism of polymer chains at the molecular levels: Which comes first, chain folding or lamellae formation … 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 …

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WebMay 1, 2024 · Abstract. Chain-folding represents a motif configuration in lamellar polymer crystals as well as in protein beta-sheets. This report presents a survey on our current understanding about polymer ... WebOct 26, 2012 · The folding times are not clear for linear polymers because the linear chain is not necessarily required to fold, different from the cyclic chain, and does not necessarily exist within one lamella. (The thickness of the amorphous layer for linear PTHFs is about 7–9 nm as estimated from Table 2 , while DPam/Mid is about 16 which gives 16x0.605 ... st james lutheran cleveland

Polymers Free Full-Text Understanding the Structural Evolution …

WebMar 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 … WebMay 24, 2013 · As an example, for a linear polymer like PE, if crystallized from dilute solution, the chains are likely to fold back and forth to form the adjacently re-entrant chain folding structure [19][20 ... WebJan 23, 2011 · Controlled chain folding is a characteristic feature of biological polymers. Many proteins, for example, fold in solution into delicate molecular origami stabilized by non-covalent (such as ... st james lutheran howard lake

Foldamer hypothesis for the growth and sequence differentiation …

Polymer Chains Fold Prior to Crystallization ACS Macro Letters

Web[ABSTRACT] Chain-folded lamellar crystal growth of polymers typically makes a semicrystalline texture, which exhibits a layer-by-layer, alternating assembly of crystalline … WebAug 1, 2024 · PDF. Synthetic polymer single-chain nanoparticles (SCNPs) are an emerging new class of nanomaterials that possess similar folded structures as natural proteins. … st james lutheran church youngstown paWebGeneral chain-folding behavior, J. Polymer Sci. A-2 10, 221–238 (1972). CAS Google Scholar L. D’Ilario, A. Keller, and E. Martuscelli, … st james lutheran portland

"WebMar 10, 2014 · The folded-chain lamellar crystals grown from the extended-chain precursor have been proposed by Keller and Machin [27], and such different trends of chain-folding result in a shish-kebab structure of crystallites, as observed even by means of atomic force microscopy in the crystallization process of sheared bulk polymers [50]. Since our ... " - Chain folding polymers

Chain folding polymers

Single-Chain Folding of Synthetic Polymers: A Critical …

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. WebAug 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 …

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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... WebPolymer chains are fractal objects whose dimensionality is determined by interactions between the monomeric units and solvent molecules. 192 Figures 12(a) and 12 (b) show …

WebApr 13, 2024 · PDF The self-avoid random walk algorithm has been extensively used in the study of polymers. In this work we study the basic properties of the... Find, read and cite all the research you need ... Webthe 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 …

WebMay 29, 2014 · Despite tremendous efforts over the last half-century to elucidate the chain-folding (CF) structure of semicrystalline polymers, the re-entrance sites of folded chains, the successive CF number n, and the adjacent re-entry fraction F have not been well characterized due to experimental limitations. In this report, 13 C– 13 C double-quantum …

WebThe study of the formation of lamellar polymer crystals through chain folding has received a new impetus as a result of the recent synthesis of normal alkanes of strictly uniform chain lengths up to C 390 H 782. Chain folding is found in all such paraffins starting with C 150 H 302. As with polyethylenes obtained by conventional polymerization ...

WebMar 14, 2024 · The encoding of information by defining the sequence of monomers is a highly anticipated strategy for controlling the three-dimensional structures of polymers via information-driven chain folding and self-assembly. st james lutheran school howard lake mnWebSep 28, 2024 · Amphiphilic tetrafluorostyrene monomers (EFSn) carrying in the para position a polyethyleneglycol (PEG) chain with varied lengths (n = 3–13) were synthesized and polymerized by ARGET-ATRP to obtain the corresponding amphiphilic homopolymers pEFSn-x with controlled and tailored polymerization degrees (x = 8–135). All polymers … st james lutheran school howard lakeWebThe advances carried out in recent years in the folding of single polymer chains into discrete SCNPs via multi-orthogonal interactions using different reactive chemical … st james lutheran school sumter scWebFeb 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 ... st james lutheran schoolWebAug 4, 2024 · Precise folding of a biopolymer chain is an essential process to attain sophisticated higher-ordered structures, such as DNA packing and three-dimensional (3D) protein structures, which is ... st james lutheran philadelphiaWebAug 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 … st james lutheran howard lake mnWebThe current contribution serves as a critical update to a previous feature article from us (Macromol.Rapid Commun.2012, 33, 958−971), and highlights the latest advances in the preparation of single chain polymeric nanoparticles and initial—yet promising—attempts towards mimicking the structure of natural biomacromolecules via single-chain folding … st james lutheran shawano wi