Crystallization of cyclic polymers
WebThe 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 … WebDec 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...
Crystallization of cyclic polymers
Did you know?
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 WebCrystallization of polymers is a process associated with partial alignment of their molecular chains. These chains fold together and form ordered regions called lamellae, which compose larger spheroidal structures …
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 … WebSep 6, 2013 · High-molecular-weight poly-γ-glutamic acid-based polymers have been synthesized, tested and adopted for protein crystallization. Protein crystallization has …
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 … WebApr 24, 2024 · Generally, the initial process of polymer crystallization proceeds through the stages of primary nucleation and crystal growth [ 1 ]. Nucleation is the process of the formation of the nucleus from the melt or solution through disentangling, reeling of chains, and chain sliding diffusion.
Webnucleation and crystallization kinetics for cyclic and linear polymeric chains. However, the results published so far seem to be dependent on the type of polymer employed. …
WebNov 28, 2024 · Simulation results suggested that the filled cyclic polymers exhibit higher melting temperature, higher crystallization temperature, and faster crystallization rate than the analogous... hobart food preparation equipmentWebJul 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. hobart food slicerWebApr 7, 2024 · More appealingly, PEOx exhibited a green closed-loop recycling characteristic by thermolysis to a cyclic monomer and repolymerization to the polymer. Accordingly, the successful scale-up preparation of the high-performance PEOx material shows a potential commercial opportunity toward marine degradable plastics. hrn hazard rating numberWebJan 1, 2015 · Crystallization of Cyclic Polymers 1 Introduction. Cyclic polymers are fascinating materials. They only differ from linear analogs in their lack of chain... 2 Types of Cyclic Polymers. The crystallization of several types of cyclic polymers is presented in … hobart food processor fp100WebMar 31, 2024 · In order to synthesize the polymer films using the plasma processes, therefore, it is very important to increase the density and electron temperature of plasma during plasma polymerization. This Special Issue aims to compile original and cutting-edge research works in the fields of plasma process, polymerization, synthesis, … hobart food warmer 32555156Webissues 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 hobart food processorWebApr 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 … hobart food warmer element