Spherulitic growth
Web17. feb 2015 · The first two regimes are explored and analyzed by means of experimental protocols developed on purpose. In particular: - spherulitic nucleation and growth rates … WebAbstract. I show that diffusion-controlled growth can account for the occurrence of spherulites, their small-angle non-crystallographic branching, and the linear form of their radial growth rate. The characteristic dimension of the large-scale morphology is predicted to scale with √δ, where δ is the diffusion length.
Spherulitic growth
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WebAnalysis of results reveals that the AP crystallization contributes 25% to the overall crystal fraction. A spherulitic structure of alternating radial lamellae from amylose (AM) or AP melts in a higher temperature region between 75 and 86 degrees C. ... This has been related to a contraction of the AMAP-co-spherulite due to an excessive growth ... Webspherulitic growth was observed after further annealing at 70°C for 8 min followed by quenching to the various crystallization temperatures (10-35°C). All the above
WebNational Center for Biotechnology Information Web24. jún 2015 · ( a) The growth of PBS spherulites (S 1 and S 2) in the phase-separated melt at 80 °C. The dotted line I 1 denotes the interface between the PBS- and PES-rich phases. The spherulitic radius in...
Web25. jún 2015 · The linear growth rate of spherulites, defined as the rate of change of the spherulite radius with time, is somehow connected with the illusory “movement” of the growth front. Actually, crystals grow by addition of material to their frozen boundaries without any real motion of the front. WebThe spherulitic growth rates for the lower polylactide (PLA) layer in poly (ε-caprolactone)/polylactide (PCL/PLA), poly (ethylene oxide)/polylactide (PEO/PLA), and poly (ethylene glycol)/polylactide (PEG/PLA) double-layer films during isothermal crystallization at various temperatures above the melting points of PCL, PEO and PEG layers have been …
WebOn the basis of data analyses on the spherulitic growth rates under various conditions from several different aspects, it is finally concluded that the decreases of glass transition temperature induced by crystallization under confinement conditions during isothermal crystallization of PLLA film samples cause the peculiar spherulitic growth rate …
Web7. júl 2024 · Spherulitic crystal growth has been extensively studied in systems of polymeric blends of large molecules and in cooling of high temperature melts. … The term … sid dewberry obitWeb1. jan 1970 · Spherulitic growth rate of isotactic polystyrene was measured in a wide range of temperature using an original technique involving self-seeding and an accurate … siddeley from cars 2Web15. apr 2024 · The spherulitic morphologies of PEG(1OH-1CH 3)/PLLA 50/50 blend films at different crystalline temperatures (T c) by POM are shown in Fig. 7a–d. In this study, the formation of PLLA spherulites was not suppressed when the crystallization temperature was less than 85 °C; on the other hand, the spherulitic growth rate was very slow at ... sidder microsoft downloadWebChirality March 18, 2024. A great proportion of molecular crystals can be made to grow as twisted fibrils. Typically, this requires high crystallization driving forces that lead to … sid dewberry obituaryWebSpherulites of phthalic anhydride have been grown from melt, and the growth morphology described. It has been shown that the presence of impurities is not a necessary condition for spherulitic growth in the system. The surfaces of the melt grown spherulities have been characterised by chemical etching and quenching. the pilgrimage route in northwest spainWeb17. jún 2024 · To form the botryoidal and spherulitic aragonite, skeletal rods and needles, resulting from disintegration of micritized bioclasts, recrystallize into nanocrystals during early marine diagenesis. These nanocrystals then grow into fibrous crystals, forming botryoidal and spherulitic aragonite. the pilgrim and the swordFormation of spherulites affects many properties of the polymer material; in particular, crystallinity, density, tensile strength and Young's modulus of polymers increase during spherulization. This increase is due to the lamellae fraction within the spherulites, where the molecules are more densely packed than in the amorphous phase. Stronger intermolecular interaction within the lamellae acc… the pilgrimage of mansa musa