Crystallization of cyclic polymers
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 ... WebBiodegradable 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 …
Crystallization of cyclic polymers
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WebSep 6, 2013 · High-molecular-weight poly-γ-glutamic acid-based polymers have been synthesized, tested and adopted for protein crystallization. Protein crystallization has … WebFeb 22, 2024 · However, the crystallization temperature of the polyurethanes with more cyclic structures evidently decreased during the cooling process, and cold crystallization was observed for PCHCU-HS4 at ~90 ...
WebFeb 19, 2024 · To investigate crystallinities based on trans-structures, we determined the differences in the crystallization properties of ring and linear polymers by performing united-atom-model molecular dynamics (MD) simulations of homogeneous polyethylene melts of equal length, N, which refers to the number of monomers per chain.Modified … 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
WebOct 7, 2013 · These crystallizations are strongly coupled: increasing side chain length promotes the side chain crystallization and weakens the main chain crystallization, as evidenced by the increased side chain melting temperature (enthalpy) and the decreased main chain melting temperature (enthalpy) with increasing side chain length. WebSep 20, 2002 · The cyclic polymer had a slightly higher melting point (T m = 132°C) and crystallization point (T c = 115°C) when compared with its linear analog (T m = 130°C;T …
WebMay 26, 2024 · Cyclic synthetic polymers have been investigated as important drug delivery tools because they often have a greater drug loading capacity than other molecules and they can help deliver drugs...
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. danny ghost gamesWebJan 1, 2024 · The crystallization and melting points, stem length, crystallinity, and latent heat of melting/crystallization of cyclic polymers are found to be substantially higher than their linear counterpart ... danny glover actor bioWebApr 21, 2024 · Cyclic polymers exhibit fascinating crystallization behaviors owing to the absence of chain ends and more compact conformations. In the current simulation, … danny gill nationwide insurance bluewell wvWebAug 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. birthday ice cream cake delivery nycWebThe physical properties of polymers depend on a range of both structural and chemical parameters, and in particular, on molecular topology. Apparently simple changes such as joining chains at a point to form stars or simply joining the two ends to form a ring can profoundly alter molecular conformation and dynamics, and hence properties. Cyclic … danny gibson therapistWebDec 14, 2024 · In cyclic polymers, the π–π stacking effect of the single-stranded segments generates the intra-chain entanglement junctions, resulting in the Tg, photophysical feature, hydrodynamic size, and... birthday ice cream barWebOct 7, 2024 · So far, many computer simulation studies on polymer crystallization have been carried out and some microcosmic mechanisms related to crystallization have been revealed [23–40]. Hagita et al. investigated the crystallization behavior of cyclic PE under static conditions by MD simulation and observed the temperature threshold of cyclic PE ... birthday ice cream cake