کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5181235 1380955 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Unusual crystallization behavior of isotactic polypropylene and propene/1-alkene copolymers at large undercoolings
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Unusual crystallization behavior of isotactic polypropylene and propene/1-alkene copolymers at large undercoolings
چکیده انگلیسی

During the investigation of the crystallization of metallocene isotactic polypropylene and copolymers with low amount of 1-butene and 1-hexene at large undercoolings, an unexpected behavior has been found. Random copolymers crystallize faster than the homopolymer between 80 and 40 °C, while at high temperatures the overall crystallization rates follow the expected trend. On the basis of structural and morphological evidences we suggest that the overall structuring kinetics of the homopolymer is slowed down by the concomitant formation of mesophase and monoclinic structures. This effect is absent in the copolymers because the branched counits retard the development of mesophase.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 55, Issue 15, 25 June 2014, Pages 3234-3241
نویسندگان
, , , , , ,