Effect of comonomer type on the crystallization kinetics and crystalline structure of random isotactic propylene 1-alkene copolymers

Jeon, Keesu; Palza, Humberto; Quijada, Raúl; Alamo, Rufina G.

doi:10.1016/j.polymer.2008.10.032

Cited by 85 publications

(81 citation statements)

References 28 publications

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“…This conclusion is consistent with other authors that reported the similarity between isotactic polypropylene and polybutene conformations, which facilitates the inclusion of 1-butene in the iPP crystal structure. [35][36][37][38][39][40] Ethylene comonomer, due to its small size, is not excluded from the crystal lattice, but it interrupts the iPP helix, shortening the crystal sequence and incorporating these distorted sequences to the amorphous fraction of the polymer. [37,41,42] Figure 1a also shows the totally amorphous profile, amPP, of an elastomeric PP sample [30] , in this case scaled to account for the amorphous component corresponding to the terpolymer.…”

Section: Experimental Partmentioning

confidence: 99%

Influence of structure on the properties of polypropylene copolymers and terpolymers

et al. 2017

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A set of Ziegler-Natta copolymers of iPP with ethylene or with 1-butene, and terpolymers with both counits have been characterized, devoting special attention to the effect of composition and processing conditions on the crystal structure and on the final properties.DSC and X-ray diffraction is used to study the polymorphism of copolymers and terpolymers.Comonomer insertion interrupts the isotactic sequences, acting as a structural defect, and the formation of  form is enhanced in the interval of studied compositions. Moreover, crystallinity decreases and crystal structure is modified. Comonomer type and concentration determine the extent of these modifications, resulting on important changes in macroscopicproperties. An important aspect to be considered is the higher ability of 1-butene units to be incorporated in the iPP crystals in relation to ethylene counits. From the balance of different properties, possible applications are suggested for the various types of samples. For instance, the excellent optical properties of the analyzed terpolymers make them very attractive for applications such as transparent film or packaging.

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Section: Experimental Partmentioning

confidence: 99%

Influence of structure on the properties of polypropylene copolymers and terpolymers

et al. 2017

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“…According to [27] , there should not be significant variations in T max when there is no change in the polymer matrix (here cis-1,4 polybutadiene) even with the insertion of different types and contents of alpha-olefins.…”

Section: Influence Of Alpha-olefin Addition On Thermal Stabilitymentioning

confidence: 99%

Copolymerization of 1-hexene and 1-dodecene with 1,3-butadiene by a versatate/diisobutylaluminum hydride/t-butyl chloride catalyst system

et al. 2014

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Abstract:The aim of this study was to incorporate an alpha-olefin (1-hexene or 1-dodecene) in a high cis polybutadiene chain, using a neodymium versatate/diisobutylaluminum hydride/t-butyl chloride catalyst system. The influence of alpha-olefin on polymerization reaction and polymer characteristics, using different weight ratios of butadiene/α-olefin, was evaluated. The copolymers were characterized by SEC, FTIR, NMR, TGA and viscosimetric analysis. The thermal stability of the polymer tended to increase with incorporation of alpha-olefins, while its microstructure was not affected. The weight average molecular mass (Mw) tended to increase and the polymerization conversion tended to decrease with increasing alpha-olefins content. The copolymers showed a lower intrinsic viscosity than for the homopolymer. The results indicated that the alpha-olefins were incorporated in the polybutadiene chain.

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“…Proton NMR relaxometry combined with high-resolution magic-angle spinning (MAS) NMR can be exploited to probe physical phase structures, domain sizes, chain conformation and chain dynamics of the final processed material in different phases. Due to the commercial importance of propyleneeethylene random copolymers (PPR) numerous studies of these polymers have been undertaken in order to characterize their chemical structure, morphology, mechanical, physical and thermal properties [24,25,30,31]. Most of these studies have focused on PPR's synthesized with metallocene-based catalysts [21,25,30].…”

Section: Introductionmentioning

confidence: 99%

The chemical structure of the amorphous phase of propylene–ethylene random copolymers in relation to their stress–strain properties

Agarwal

Erp

Balzano

et al. 2014

Polymer

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Effect of comonomer type on the crystallization kinetics and crystalline structure of random isotactic propylene 1-alkene copolymers

Cited by 85 publications

References 28 publications

Influence of structure on the properties of polypropylene copolymers and terpolymers

Influence of structure on the properties of polypropylene copolymers and terpolymers

Copolymerization of 1-hexene and 1-dodecene with 1,3-butadiene by a versatate/diisobutylaluminum hydride/t-butyl chloride catalyst system

The chemical structure of the amorphous phase of propylene–ethylene random copolymers in relation to their stress–strain properties

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