The influence of the epitaxial crystallization of the polyethylene (PE) content on the adhesive interface strength of impact‐toughened isotactic polypropylene (iPP) has been investigated. The ...morphologies and crystal arrangements of four different matrix/rubber combinations were observed by transmission electron microscopy (TEM) and were correlated with the interface strengths measured by a peel test. It was found that the adhesion is best at interfaces, where an epitaxial morphology of the PE was observed.
Full text
Available for:
BFBNIB, FZAB, GIS, IJS, KILJ, NLZOH, NUK, OILJ, SBCE, SBMB, UL, UM, UPUK
The controlling factors for the epitaxial crystallization of high-density polyethylene (HDPE) on highly oriented isotactic polypropylene (iPP) substrates have been studied in detail by means of ...transmission electron microscopy and electron diffraction. The results obtained in this work indicate that the crystallization process must be considered in the investigation of epitaxial growth of polymers on polymeric substrates, because of the unique morphological and crystallization characteristics of polymers. Crystallization rate has an important effect on the epitaxial crystallization of polymers. Higher rates result in the formation of thicker epitaxial layers. Isothermal crystallization temperature is another factor affecting epitaxial growth of polymers. Lower temperatures are favorable to epitaxial crystallization of polymers. There exists a critical epitaxial temperature at given experimental conditions, above which no epitaxial growth occurs at all. The influence of crystal dimensions of both the substrates and the deposited polymers on epitaxial growth confirms that secondary nucleation is an important controlling factor for the occurrence of epitaxial crystallization in polymers. The requirement satisfying the secondary nucleation criterion is that the substrate crystal dimension in the matching direction must be greater than the crystal thickness of the deposited polymer. Once the requirement of the secondary nucleation is satisfied, subsequent epitaxial growth is based on the lamellar growth habit of the deposited polymer itself.
Full text
Available for:
IJS, IMTLJ, KILJ, KISLJ, NUK, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
SummaryThe thermo-mechanical properties of the blend syndiotactic polystyrene (sPS)/ atactic polystyrene (aPS) are characterized by studying the concentration depending softening behavior with ...thermo-mechanical analysis (TMA) and the temperature depending Young's modulus for different concentrations with dynamic mechanical analysis (DMA).
Full text
Available for:
EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OBVAL, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
Die vorliegende Arbeit ist als praktische Hilfe für den Russischlehrer gedacht. Die Verwendung der verbreiteten Schulausgaben hat zur Folge, daß einzelne Autoren als Verfasser kurzer Prosaformen oder ...sprachlich leichterer Texte im Vergleich zu anderen überrepräsentiert sind (Bevorzugung z.B. von Cechov, Zoščenko). Man sah daher die Notwendigkeit, eine Literaturliste zu erarbeiten, aufgrund derer ein umfassenderes Bild der russischen und sowjetischen Literatur vermittelt werden kann. Diese Liste berücksichtigt (...) für den Schulunterricht wichtigen Epochen einschließlich der neuesten Sowjetliteratur, bezieht alle Gattungen ein ebenso wie Formen der Volksliteratur, die im Literaturunterricht selten behandelt werden (Castuški, Bylinen, Märchen). Literaturverz. S. 61 - 149. Durchsuchbare elektronische Faksimileausgabe als PDF. Digitalisiert im Rahmen des DFG-Projektes Digi20 in Kooperation mit der BSB München. OCR-Bearbeitung durch den Verlag Otto Sagner.
The morphology and melting behavior of overgrown lamellae (i. e., kebabs) in shish‐kebab composite crystals for isothermally cold‐crystallized isotactic polystyrene (iPS) have been studied using ...transmission electron microscopy (TEM). The bright‐ and dark‐field morphological investigations indicate that the entire shish‐kebab entity consists of at least three components: the central backbone (i. e., extended‐chain type shish crystals), the (partially extended‐chain type) micellar kebabs and the folded‐chain type lamellar kebabs. The morphological transformation between the micro‐ and macro‐kebabs is reversible and can be realized via (partial) melting and recrystallization processes, due to the differences in their thermal stability.
Full text
Available for:
BFBNIB, FZAB, GIS, IJS, KILJ, NLZOH, NUK, OILJ, SBCE, SBMB, UL, UM, UPUK
PDF
