Effect of polymorphism of isotactic polybutene-1 on peel behavior of polyethylene/polybutene-1 peel systems

Autor: Wolfgang Grellmann, Beate Langer, Michael Nase, René Androsch, Hans Joachim Baumann
Rok vydání: 2007
Předmět:
Zdroj: Journal of Applied Polymer Science. 107:3111-3118
ISSN: 1097-4628
0021-8995
DOI: 10.1002/app.27483
Popis: The effect of polymorphism of isotactic polybutene-1 (iPB-1) on the peel behavior of the specific peel system low-density polyethylene/polybutene-1 (LDPE/iPB-1) was investigated using wide-angle X-ray scattering, calorimetry, and the T-peel test. Melt-crystallization of iPB-1, initially, yields tetragonal form II crystals which transform as a function of time to trigonal form I crystals. The kinetics of transformation at ambient temperature follows an exponential function, and is completed after about 50-75 h. The presence of LDPE in the peel system does not affect the transformation kinetics. The structure of the crystalline phase of iPB-1 controls the peel force which decreases by about 25% during the crystal-crystal transformation in a blend with 20 m% iPB-1. The reduction of the peel force depends linearly on the mass fraction of iPB-1 crystals in the peel system which further evidences the correlation between the crystal-crystal transformation of iPB-1 and the peel-characteristics of LDPE/iPB-1 blends. Isothermal reorganization of crystals of LDPE is excluded as reason for the change of the peel-performance of LDPE/iPB-1 blends, since it is 5 to 10 times faster than the decrease of the peel force, and crystal-crystal transformation of iPB-1, respectively.
Databáze: OpenAIRE
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