Structure-properties relationships in some random copolymers of propylene
References (8)
Polymer
(1971)- et al.
Makromolek. Chem.
(1964) J. Polym. Sci.
(1968)J. Polym. Sci.
(1968)- et al.
Polymer
(1961)
Cited by (66)
High-pressure crystallization of iPP nanocomposites with montmorillonite and carbon nanotubes
2022, Thermochimica ActaPoly(propylene-co-1-pentene-co-1-heptene) terpolymers: Mechanical and rheological behavior
2018, PolymerCitation Excerpt :Thus, the slowly crystallized iPP homopolymer exhibits the diffractions corresponding to both the monoclinic α lattice and the orthorhombic γ modification, with a majority in the first one, judging from the relative intensities of the (130) reflection from the monoclinic α polymorph [23] and of the characteristic (117) reflection stemming from the orthorhombic γ cell [24]. Presence of comonomers in the S specimens of T4-75Pe-25Hp, T4-50Pe-50Hp, and T4-25Pe-75Hp significantly favors the formation of γ crystallites [25], [26], [27]. Monoclinic α crystals are, however, the unique polymorph in the Q samples for this overall composition (and for the homopolymer).
On the structure and nucleation mechanism in nucleated isotactic polypropylene crystallized under high pressure
2018, PolymerCitation Excerpt :The γ-polymorph was found in PP of very low molar mas [ 7–9]. It was also observed in propylene copolymers with small content of 1-olefine co-units [10–16] as well as in metallocene PP of high molar mass with stereo- or regio-chain irregularities [17–21] because chain defects enforce crystallization of relatively short isotactic sequences in the extended form [19]. For the formation of the γ-phase the effective average length of isotactic sequences is crucial [22,23], and because of that the effects of stereo- and regio-defects on the γ-content are similar [24].
Influence of structure on the properties of polypropylene copolymers and terpolymers
2017, Polymer TestingCitation Excerpt :The presence of comonomer causes major structural defects in the polymer chain, which leads to shorter crystallizable sequences, favoring the formation of γ−crystals. The present results are in line with the work of other researchers [15,44]. It is also important to remark that crystallinity hardly changes with the 5% mol counits of the analyzed comonomers and terpolymer, and independently of the thermal treatment in relation to the homopolymer.
Multi walled carbon nanotubes induced viscoelastic response of polypropylene copolymer nanocomposites: Effect of filler loading on rheological percolation
2016, Polymer TestingCitation Excerpt :Polypropylene random copolymer (PPCP) is a semi-crystalline polymer with high flexibility, better clarity and high impact strength than polypropylene homopolymer (PP) [1–5].