Synthesis, molecular characterization, evaluation of polymorphic behavior and indentation response in isotactic poly(propylene-co-1-heptene) copolymers

García‐Peñas, Alberto; Gómez‐Elvira, José M.; Lorenzo, Vicente; Pérez, Ernesto; Cerrada, María L.

doi:10.1016/j.eurpolymj.2014.12.035

Cited by 15 publications

(33 citation statements)

References 56 publications

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“…All these data reported in Table indicate a good monomer distribution along polymeric chains. The isotacticity of the samples decreases with 1‐heptene content, as shown by the mmmm pentad fraction, and the average propylene length n p (determined as previously reported) is also reduced with increasing comonomer content. Evidently, these microstructural features will have an important effect on crystalline characteristics, such as the crystallinity and crystal perfection, as shown below.…”

Section: Resultssupporting

confidence: 73%

“…Moreover, there is a clear increment of the shoulder in the low‐temperature region of the main endotherm as the previous cooling rate decreases, indicative of higher amounts of orthorhombic modification . The diffraction experiments on slow cooled samples showed this aspect …”

Section: Resultsmentioning

confidence: 86%

“…Very few investigations, however, have been dedicated to propylene‐ co ‐1‐heptene (cPHp) copolymers and those published are mostly focused on several characteristics of copolymerization kinetics and of the resulting microstructure . We have recently published a paper concerning the details of the synthesis and molecular characterization of several cPHp copolymers in a broad range of compositions, together with preliminary results on several aspects of some structural and mechanical features.…”

Section: Introductionmentioning

confidence: 99%

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Mesophase features in isotactic poly(propylene‐co‐1‐heptene) copolymers

García‐Peñas

Gómez‐Elvira

Orden

et al. 2016

Polymer International

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The influence of crystallization rate on the interesting polymorphism of random isotactic poly(propylene-co-1-heptene) copolymers was studied, with particular attention to the conditions for obtaining the mesomorphic phase. Owing to the important decrease of cooling rate involved as the 1-heptene content increases, the mesophase can be clearly observed by DSC for co-unit contents above about 5 mol%. Furthermore, only the mesophase (or the amorphous phase) was found for the copolymer with 13.9 mol% 1-heptene at common cooling rates of the calorimeter. Additionally, the copolymer with 21.4 mol% co-units was found to be completely amorphous under any thermal treatment analyzed. Variable-temperature diffraction experiments were carried out to ascertain unambiguously the nature of the phases involved. Finally, a remarkable transparency was attained (above 80% transmittance in the visible light region) at intermediate and high 1-heptene contents, using easily accessible cooling rates.

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Section: Resultssupporting

confidence: 73%

Section: Resultsmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mesophase features in isotactic poly(propylene‐co‐1‐heptene) copolymers

García‐Peñas

Gómez‐Elvira

Orden

et al. 2016

Polymer International

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“…In fact, a new polymorphic form has been reported for copolymers of propene with high content of long α‐olefins, as 1‐hexene and 1‐heptene. This structure is identified as trigonal form and is generated at slow crystallization rates …”

Section: Introductionmentioning

confidence: 99%

Influence of the Polymeric Matrix and Thermal Treatment on the Properties of Polyolefin‐Graphite Nanosheets Nanocomposites

González

Quijada

Yazdani‐Pedram

et al. 2016

Macro Materials & Eng

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Homo and copolymers of metallocenic poly(propylene) with 1‐hexene and 1‐octadecene are used to prepare nanocomposites via melt mixing by using graphite nanosheets (GNSs) as filler. Different amounts of GNSs are used in order to study the influence of the filler on the thermal, mechanical, and electrical properties of nanocomposites. Significant changes have been observed in the crystallization temperature (Tc) of the nanocomposites. Thermogravimetric analysis shows improvement in thermal stability. Young's modulus and elongation at break of the nanocomposites are depended on the type of the matrix and the amount of GNSs. Materials with high flexibility are obtained in the cases of matrices based on copolymers even at high filler loading. Nanocomposites have become a semiconductor material reaching conductivity of 10−4 S cm−1. Two different thermal treatments have been applied in the preparation of the films by compression molding. X‐ray diffraction analysis shows the existence of polymorphism according to the thermal treatment applied.

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“…This approach has been successfully employed in the case of polypropylene based copolymers [32][33][34]. On cooling experiments from the melt, no sign of crystallinity is observed above around 145 °C.…”

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confidence: 92%