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Development of the mesomorphic phase in isotactic propene/higher α-olefin copolymers at intermediate comonomer content and its effect on properties |
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| Authors: | MJ Polo-Corpa T Velilla R Quijada E Pérez |
| Institution: | a Instituto de Ciencia y Tecnología de Polímeros (CSIC), Juan de la Cierva, 3. 28006 Madrid, Spain b Centro para la Investigación Multidisciplinaria Avanzada en Ciencias de los Materiales (CIMAT), Santiago, Chile c Departamento de Ingeniería Química, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Casilla 2777, Chile |
| Abstract: | Several isotactic propene-α-olefin copolymers using 1-octene, 1-dodecene and 1-tetradecene as comonomers (CiPO, CiPDD and CiPTD, respectively) have been synthesized and their structure and thermal/mechanical/viscoelastic properties have been evaluated. At intermediate comonomer molar content ranged from around 4 to 9, the mesomorphic phase is developed under rather mild quenching conditions and independently of length of the comonomer. Thermal and mechanical parameters diminish as α-olefin content increases and their dependence on composition changes as function of existence of three-dimensional monoclinic crystallites or less ordered entities. |
| Keywords: | Isotactic polypropylene Propylene-α-olefin copolymers Metallocene catalyst Monoclinic crystallites Mesomorphic phase |
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