Some peculiarities of the influence of the phase state of systems polyethylenelow molecular solvent on tlie morphology of the supermolecular structure of polyethylene were eslablished. With equal concentrations and almost equal crystallization temperatures it is possible to obtain Iletlritcs a n d banded spherulites depending o n the phase state determined by the phase diagram.
I n Systemen aus Polyethylen und niederrnolekularen Losungstti itteln erhaltene ubermolekulare StrukturenEinige Besonderheiten des Einflusses des Phasenzustandes von Systemen aus Polyethylen und niederrnolekularen Losungsmitteln auf die Morphologie der ubermolekularen Struktur des Polyethylens werden dargelegt. Bei gleicher Konzentration und etwa gleichen Kristallisationstemperature11 ist es moglich, in Abhangigkeit von dem durch das Phasendiagramni bestimmten Phasenzustand Hedritc uud gebanderte Spharolithe zu erhalten.
The radical copolymerization of , '-bisand N,N', N,,-tris(2-hydroxy-3-allyloxypropyl) isocyanurates (DHAIC and THAIC) with methyl methacrylate (MMA) and styrene (S) was studied and the rate constants were evaluated. Increase in the functionality of allylisocyanuric monomers was accompanied by growth of the rate constants for S and MMA. MMA copolymerizes with DHAIC and THAIC at a substantially higher rate than with S. The maximum completeness of copolymerization of S decreased at higher concentrations of THAIC in the initial mixture, while that of MMA passed through a maximum.
The mechanical properties of thin foils of binary systems of high molecular weight poly(ethylene oxide) and salts of alkali metals (NaSCN, KSCN,NaI, KI) have been investigated as a function of composition. The yield strength, tensile strength, elongation at break and Shore hardness of the foils change nonlinearly with the increase of alkali salt content. It was established that the systems PEO-NaI, PEO-KSCN and PEO-KI are noncrystalline in a concentration range of alkali salts corresponding to 9 mol PEO per 1 mol alkali salt and they are in a rubbery or plastic state at room temperature.
Mechanische Eigenschaften binarer Mischungen von hochrnolekularern Poly(ethy1enoxid) und AlkalirnetallsalzenDie mechanischen Eigenschaften dunner Filme aus binaren Systemen von hochmolekularem Poly(ethy1enoxid) und Alkalimetallsalzen (NaSCN, KSCN, NaI, KI) wurden in Abhangigkeit von der Zusammensetzung untersucht. Die Dehnfestigkeit, ReiDfestigkeit, Bruchdehnung und Shoreharte der Filme andern sich nichtlinear mit zunehmendem Gehalt an Alkalisalzen. Es wurde festgestellt, daB die Systeme PEO-NaI, PEO-KSCN und PEO-KI in einem Konzentrationsbereich, der 9 mol PEO auf 1 mol Alkalisalz entspricht, nichtkristallin sind und daD sie bei Raumtemperatur in einem gummiartigen oder plastischen Zustand vorliegen.
X-ray and calorimetric investigations of the structure and transformations on heating of quenched (undercooled) samples of poly(ethy1ene oxide)-urea molecular complexes are discussed. It was established that at room temperature the undercooled melt of the molecular complex contains free urea in a tetragonal crystal modification and a high-temperature poly(ethy1ene oxide)-urea molecular complex whose crystal modification does not coincide with the known hexagonal crystal structure of the molecular complex obtained from solution or by slow cooling from the melt. It was shown that on heating this molecular complex to a temperature between 87,5 and 90 "C, the hexagonal crystal modification, stable at room temperature, is obtained.
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