Spherulitic crystallization in polypropylene
WebA survey has been made of spherulites formed by the isothermal crystallization of polypropylene from the melt in the temperature range 110°–148°C. Four types of … WebSpherulitic morphology of isothermally crystallized iPP from melt (COST Action P12-Borealis) at Tc = 124 oC [49] Crystallization of Polypropylene: Application of Differential Scanning Calorimetry. Part II. 75 Prilozi, Odd. mat. teh. nauki, XXIX, 1‡2 (2008), str. 69‡87
Spherulitic crystallization in polypropylene
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WebJun 21, 2014 · When the roll temperature was increased to 60°C, mesomorphic phase coexisted with spherulitic crystal structure, and totally transformed to monoclinic … WebAbstract: The α and β phases of isotactic polypropylene form a pair of crystal phases which are characterized by the fact that the less stable β phase has a faster growth rate than the …
WebOct 11, 2024 · The morphological results showed reduced spherulitic crystal nucleus size and increased distribution in blends with increasing LMPP. ... Chen, J.-H.; Tsai, F.-C.; Nien, … WebIn polymer physics, spherulites (from Greek sphaira = ball and lithos = stone) are spherical semicrystalline regions inside non- branched linear polymers. Their formation is …
WebY-axes in a minute from the crystallization time of 43-44 min, respectively. The uncertainty of the displacement is about 3%. Figure 3. Displacement rates of the three CB particles during crystallization of isotactic polypropylene at 138 °C. Particles 1, 2, and 3 were the same three CB particles shown in Figure 1. The uncertainty WebJan 14, 2024 · The crystallization behavior of isotactic polypropylene containing a fibrous nucleating agent in a flow field was investigated using a polarized optical microscope …
WebThe analysis of the potential energy of the crystal lattice of isotactic polypropylene during the βα phase transition was carried out. This transformation was realized by rotations and translations within a collection of 10 iPP helices. The lattice energy was calculated by means of the atom-atom potential method. Results and analysis of the data allow to …
WebCombined effects of graphene nanosheets (GNSs) and shear flow on the crystallization behavior of isotactic polypropylene (iPP) were investigated by in-situ synchrotron wide-angle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS) techniques. For crystallization under quiescent condition (at 145 °C), the half-crystallization time (t1/2) of … sklearn itemcfWebJun 1, 2016 · Degree of Crystallization. To calculate the degree of crystallization the melting enthalpy was determined with DSC measurements using a Q 1000 TMDSC by TA … swarms of ladybugsWebApr 15, 2024 · The morphology and microstructure of crystalline blends of poly (ethylene glycol) (PEG) and poly (L-lactic acid) (PLLA) were examined using polarized optical microscopy (POM) and scanning electron microscopy (SEM). As PEG was in the melt state during PLLA crystallization, it was rejected from the PLLA bundles. The size of PEG … swarms of officersWebThe properties of the individual chain folded lamellae that form the spherulite are predicted, including the change of step height with growth temperature, melting behavior, and the … swarms of officers eat out our substanceWebSep 13, 2024 · We find that spherulitic superstructures play a critical role in the rheology, especially in the characteristic sharp upturn in moduli. ... Pogodina, N. V., H. H. Winter, and S. Srinivas, “Early stages of polypropylene crystallization as physical gelation,” in Abstracts of Papers of the American Chemical Society (ACS, 1999), Vol. 218, pp ... swarms of rio revelers crosswordWebThe crystallization behavior of polyolefins has been extensively investigated in recent decades. In this work we have investigated shear-enhanced crystallization of isotactic … sklearn kdtree.queryWebJan 6, 2024 · Author: Prolific author: Publications (under my maiden name): Ujemne Cisnienie I Kawitacja Podczas Krystalizacji Polimerow (Polimery i Kompozyty Konstrukcyjne, 1998), E. Piorkowska, Joanna Kolasinska 1. Cavitation during Isothermal Crystallization of Isotactic Polypropylene, 2000, R.Nowacki, J.Kolasinska, E.Piorkowska … swarms of people