ISSN:
1435-1536
Keywords:
Isotactic polypropylene
;
small molecular additives
;
thermal treatment
;
phase transition
;
wide-angle X-ray diffraction
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract Investigations into the transformation of hexagonal into monoclinic modification in isotactic polypropylene (iPP) were carried out. The hexagonal phase (β) was obtained by crystallization from a melt of iPP samples containing small molecular compounds (additives). A decline in the amount ofβ-modification and changes of dimensions of ordering areas, perpendicular to the chain axes of iPP, was analysed at various temperatures and times of heating. The interdependence between the structure of additives and the amount ofβ-phase occurring and also the stability of this modification during thermal treatment was observed. Obtained results indicated that only some additives play the role of moderating agents for theβ →α phase transition process.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01410991
Permalink
