Development of elastic recovering 4-methyl-1-pentene/propylene copolymer

Okamoto, Masahiko; Mita, Kazuki; Uekusa, Takayuki; Takenaka, Mitsuru; Shibayama, Mitsuhiro

doi:10.1016/j.polymer.2020.122269

Cited by 3 publications

(3 citation statements)

References 27 publications

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“…Moreover, a moderate elastic behavior after breaking has been observed in the samples with high comonomer content (iP4MPHD–3 and iP4MPHD–4), as demonstrated by the values of the residual deformation after breaking R b greater than 60%. As mentioned in the Introduction, elastic properties were also observed in the case of isotactic 4-methyl-1-pentene/propylene copolymers with high propylene content …”

Section: Results and Discussionmentioning

confidence: 72%

“…As mentioned in the Introduction, elastic properties were also observed in the case of isotactic 4-methyl-1-pentene/propylene copolymers with high propylene content. 40 The results shown in Figure 3 and Table 2 demonstrate that the incorporation of methylene-1,3-cyclopentane units into the poly(4-methyl-1-pentene) main chain produces an improvement in flexibility and allows tailoring of the deformability while retaining high mechanical resistance.…”

Section: ■ Results and Discussionmentioning

confidence: 94%

“…Very recently, Okamoto and co-workers synthesized 4-methyl-1-pentene/propylene random copolymers by using a metallocene catalyst. They showed that copolymers with propylene contents in the range of 28–75 mol %, are amorphous and exhibit excellent elastic properties.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Characterization of 4-Methyl-1-Pentene/1,5-Hexadiene Isotactic Copolymers with Enhanced Low-Temperature Mechanical Performance

De Stefano,

Scoti,

De Rosa

et al. 2024

Macromolecules

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Novel 4-methyl-1-pentene/1,5-hexadiene isotactic copolymers (iP4MPHD) incorporating methylene-1,3-cyclopentane (MCP) cyclic co-units with concentrations in the range 4.4− 17.6 mol % have been synthesized by using the dimethylpyridylamidohafnium/organoboron catalyst. The influence of the MCP cyclic co-unit on the crystallization behavior and the mechanical properties of the isotactic poly(4-methyl-1-pentene) (iP4MP) homopolymer has been investigated in detail. iP4MPHD copolymers with comonomer content up to 11 mol % crystallize in form II of iP4MP from the polymerization solution and in the stable form I of iP4MP from the melt, whereas the sample with the highest concentration (17.6 mol %) of 1,5-hexadiene (1,5-HD) is amorphous and does not crystallize from either solution and melt. All crystalline samples exhibit high melting temperatures, always above 120 °C, and a controlled glass transition temperature close to the room temperature (28−30 °C). Incorporation of MCP units into iP4MP chains produces an improvement in flexibility and allows tailoring of deformability while retaining high mechanical resistance and transparency of the homopolymer. Interestingly, the high deformability is maintained at low temperature (50 °C below the glass transition temperature), suggesting a cooperative role of both amorphous and crystalline phases in the deformation mechanism that enhances ductility. All stress−strain curves of the different copolymers present an unusual second maximum at strains higher than the yielding point. Diffraction patterns recorded during deformation have revealed that this second maximum is associated with the crystallization under stretching of a highly disordered crystalline mesophase never described in the literature.

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Section: Results and Discussionmentioning

confidence: 72%

Section: ■ Results and Discussionmentioning

confidence: 94%