Crystallization of cyclic polymers
WebCyclic polymers with a ring-like topology and no chain ends are a unique class of macromolecules. In the past several decades, significant advances have been made to … WebWhat’s more, by inducing orientation crystallization, Wei et al. [35]. synthesized a polymer with fast room temperature self-healing ability (mechanical properties fully recovered within 24 h) and tensile strength up to 29.0 MPa. The design of multiple continuous pyridine ring hard segment structure was the key to the formation of orientated ...
Crystallization of cyclic polymers
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WebApr 13, 2024 · In recent years, expanded polystyrene (EPS) lightweight soil has been widely used as subgrade in soft soil areas because of its light weight and environmental protection. This study aimed to investigate the dynamic characteristics of sodium silicate modified lime and fly ash treated EPS lightweight soil (SLS) under cyclic loading. The effects of EPS … Webissues do not favor formation of an infinitely large crystal in polymers, which are characterized, by the formation of finite sized crystals. The exact nature and morphology of these crystals however, has been one of the most heavily debated topics in polymer science. 2.3 Crystallization in polymers: structure, models & relationships
WebJul 27, 2015 · Thus, the crystallization rate was slower for the cyclic poly(THF), and the unusual spherulite structure was formed. 17,34 The slower growth rate for the cyclic polymer was accounted for by their conformational constraints suppressing the propagation at the crystallization front. WebOct 7, 2013 · Annealing above the isotropic temperature followed by cooling significantly enhanced the polymer crystallization, whereas annealing between the two melting temperatures is not effective in promoting crystallization due to the coupling of the side chain and main chain crystallization. ... Cyclic polymers revealing topology effects …
WebPolymers which crystallize rapidly can be efficiently molded into useful articles; that cyclic polymers crystallize faster is both useful and interesting, as it illuminates how the … WebThe effect of chain topology (ring versus linear polymer chains) on polymer crystallization is reviewed. Recent advances in ring closure and ring expansion synthetic …
WebDec 2, 2016 · The simulated crystallization and melting behavior of entangled polymer melts using molecular dynamics where each chain is subject to a force dipole acting on its ends suggests that a strong increase in the lamellar thickness induced, by external deformation, a topological rather than a thermodynamic origin. 5 PDF
WebApr 13, 2024 · In recent years, expanded polystyrene (EPS) lightweight soil has been widely used as subgrade in soft soil areas because of its light weight and environmental … dialyse in bad füssingWebAug 11, 2015 · The crystallization and melting points, melting/crystallization enthalpies, and overall crystallization kinetics of cyclic P3HTs are found to be … ciphers by christoph gielenWebMar 16, 2011 · reduction of the crystallization tendency with decreasing large-scale chain mobility and increasing steric hindrance of the individual polymer chains. Here, we … dialyse iserlohn buniaWebAug 16, 2013 · Because polymer systems are usually crystallized in the condition far from the equilibrium state, that is, under a large supercooling degree, the energy gap between the crystalline and melt states may be larger than that of the liquid–liquid phase separation. dialyse ibuprofenWebSep 12, 2024 · However, the hydrolysis of the amorphous part combined with chemi-crystallization, caused by UV irradiation and cyclic exceeding the glass transition temperature of the material in humid conditions, results in a prominent increase in the composites’ crystallinity, hence their higher stiffness, increased glass transition … dialyse informationsbroschüreWebApr 10, 2024 · Development of sustainable adhesives requires simultaneous realization of high strength and excellent ductility but remains challenging. Here, we prepare furan-ring-containing biomimetic multiphase polymers to afford fully sustainable, strong, and supertough adhesives, showing that the key factors of these adhesives are the … dialyse informationenWebBiodegradable and hydrophilic functional polyesters were synthesized enzymatically using xylitol or d-sorbitol together with divinyl adipate and lipase B from Candida antartica (CAL-B). The resulting polyesters had pendant OH-groups from their sugar units which were esterified to different degrees with stearic acid chloride. The structure and the degrees of … ciphers and cryptography