Polymer paperHigh pressure d.t.a. study on the melting and crystallization of isotactic polypropylene
References (13)
- et al.
J. Polym. Sci. (A)
(1965) - et al.
Colloid. Polym. Sci.
(1978) - et al.
Nature Phys. Sci.
(1972) - et al.
Polym. J.
(1973) - et al.
Polym. J.
(1975) - et al.
J. Polym. Sci. Polym. Phys. Edn.
(1978)
Cited by (33)
Simultaneously improved electromagnetic interference shielding and mechanical performance of segregated carbon nanotube/polypropylene composite via solid phase molding
2018, Composites Science and TechnologyCitation Excerpt :In our previous work, elevated molding pressure was utilized to reduce the interfacial voids between polymer regions and thereby increasing the mechanical properties of segregated CPC based on amorphous polymer [2]. With respect to semi-crystalline polymer, the case becomes complicated because the Tm would increase with the increased molding pressure [16]. Additionally, the free volume of polymer would reduce and the polymer chain motion is further confined.
Structure-property relations in molded, nucleated isotactic polypropylene
2009, PolymerCitation Excerpt :Occurrence of the γ phase, with its orthorhombic unit cell, is determined by the molecular structure: (i) low stereo-regularity of the chains [39,40,50], (ii) a low molecular weight [51] and (iii) copolymerization with for instance ethylene [52]. Also in crystallization at elevated pressures γ crystal structures are sometimes observed [39,40,53]. Finally, the mesomorphic crystal phase is only found when the polymer is cooled very rapidly [60,61].
Melting point of polymers under high pressure. Part II. Influence of gases
2009, Thermochimica ActaMelting point of polymers under high pressure: Part I: Influence of the polymer properties
2004, Thermochimica ActaSecond-order phase transition of high isotactic polypropylene at high temperature
2002, PolymerCitation Excerpt :Since the application of Ziegler–Natta catalyst technology, the structure, morphology and physical properties of isotactic polypropylene (iPP) have been extensively examined for the past several decades. In the crystalline state, it has long been recognized that the iPP can exhibit several different crystalline forms, namely the monoclinic (α) form (including α1 and α2) [1–13], the trigonal (β) form [14–19], the triclinic (γ) form [20–26] and the mesomorphic (smectic) form [27]. The formation and their mutual phase transitions are critically dependent on the crystallization conditions, the molecular weight and the tacticity [28].