Abstract
Samples of random poly(butene-ran-ethylene) copolymers produced with metallocene catalysts were studied in order to elucidate the different behaviors of this particular class of materials as a function of increasing ethylene (C2) content. The samples cooled down from the melt are semi-crystalline or amorphous and crystallize in different crystal modifications, depending on the amount of C2. Thermal analysis, X-ray diffraction, and microscopic techniques were used to follow the changes of the materials with aging time and to understand the structural and morphological behavior with the aim of highlighting possible peculiar properties, which may be of great interest in the application of such materials in the field of Hot Melt adhesives.
Highlights
The first synthesis of isotactic Poly(1-butene) (PB) was reported in 1954 by Natta and collaborators [1], starting from heterogeneous solid catalysts (Ziegler–Natta catalysts) already used for the production of isotactic polypropylene, and they obtained a linear semi-crystalline polymer with high stereoregularity from the polymerization of 1-butene.The polymerization of 1-butene can be carried out using metallocene catalytic systems [2], and the use of such a catalyst ensures a better random and uniform distribution of ethylene with respect to that achieved with Ziegler–Natta catalysts
Thermal analysis, X-ray diffraction, and microscopic techniques were used to follow the changes of the materials with aging time and to understand the structural and morphological behavior with the aim of highlighting possible peculiar properties, which may be of great interest in the application of such materials in the field of Hot Melt adhesives
The results obtained from wide angle X-ray diffraction were compared to those from thermal analysis, as the crystallization procedure applied to the samples were the same for specimens subjected to WAXD as well as DTA analysis
Summary
The first synthesis of isotactic Poly(1-butene) (PB) was reported in 1954 by Natta and collaborators [1], starting from heterogeneous solid catalysts (Ziegler–Natta catalysts) already used for the production of isotactic polypropylene, and they obtained a linear semi-crystalline polymer with high stereoregularity from the polymerization of 1-butene. The polymerization of 1-butene can be carried out using metallocene catalytic systems [2], and the use of such a catalyst ensures a better random and uniform distribution of ethylene with respect to that achieved with Ziegler–Natta catalysts. Poly(1-butene) exhibits a singular and very complex polymorphic behavior: according to the conditions under which the crystallization process is conducted, five crystalline forms can be obtained [3,4] which differ in terms of unit cell, helical conformation [5,6] (Table 1), thermodynamic stability and the consequent chemical, physical, and mechanical properties.
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