Influence of metallocene structures on ethene copolymerization with 1-butene and 1-octene

Suhm, Jürgen; Schneider, M.; Mülhaupt, Rolf

doi:10.1016/s1381-1169(97)00175-1

Cited by 95 publications

(71 citation statements)

References 47 publications

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“…The activity of 7 increased at high temperature, especially at 50 • C, and no significant differences in the T g values (NBE content) in the resultant copolymers were observed by varying the temperature (25-70 • C). This would suggest that there has not been a significant temperature dependence observed for the NBE incorporation, as has been observed in ethylene/α-olefin copolymerization by ordinary ansa metallocene catalysts [68,69]. Scheme 4.…”

Section: Copolymerization Of α-Olefin With Norbornene (Nbe) or Tetracmentioning

confidence: 90%

Design of Efficient Molecular Catalysts for Synthesis of Cyclic Olefin Copolymers (COC) by Copolymerization of Ethylene and α-Olefins with Norbornene or Tetracyclododecene

Zhao

Nomura

2016

Catalysts

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Abstract:Selected results for the synthesis of cyclic olefin copolymers (COCs)-especially copolymerizations of norbornene (NBE) or tetracyclododecene (TCD) with ethylene and α-olefins (1-hexene, 1-octene, 1-dodecene)-using group 4 transition metal (titanium and zirconium) complex catalysts have been reviewed. Half-titanocenes containing an anionic ancillary donor ligand, Cp'TiX 2 (Y) (Cp' = cyclopentadienyl; X = halogen, alkyl; Y = anionic donor ligand such as aryloxo, ketimide, imidazolin-2-iminato, etc.), are effective catalysts for efficient synthesis of new COCs; ligand modifications play an important role for the desired copolymerization. These new COCs possess promising properties (high transparency, thermal resistance (high glass transition temperature), low water absorption, etc.), thus it is demonstrated that the design of an efficient catalyst plays an essential role for the synthesis of new fine polyolefins with specified properties.

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Section: Copolymerization Of α-Olefin With Norbornene (Nbe) or Tetracmentioning

confidence: 90%

Design of Efficient Molecular Catalysts for Synthesis of Cyclic Olefin Copolymers (COC) by Copolymerization of Ethylene and α-Olefins with Norbornene or Tetracyclododecene

Zhao

Nomura

2016

Catalysts

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“…[4] Consequently, an inverse relationship between the comonomer content and copolymer molecular weight is obtained, which is explained by kinetic reasons and implies a broad distribution of comonomer content in the copolymer. [5] This characteristic of the Ziegler-Natta systems makes the detailed study of the effect of comonomer incorporation on the final properties of the polymer difficult.…”

Section: Introductionmentioning

confidence: 97%

Comonomer Length Influence on the Structure and Mechanical Response of Metallocenic Polypropylenic Materials

Palza

López-Majada

Quijada

et al. 2008

Macro Chemistry & Physics

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The structure and properties have been comprehensively studied for metallocene copolymers of propylene‐1‐hexene (CiPH) and propylene‐1‐octadecene (CiPOD). The comonomer content constitutes the most important factor affecting both structure and properties in these CiPH and CiPOD copolymers, although the length of the comonomer is also very important. Thus, a considerable decrease in crystallinity and an easier obtainment of mesomorphic‐like ordered entities are observed in the two kinds of copolymers as comonomer content increases. The variations in crystalline structure significantly influence the viscoelastic and mechanical behaviors of these CiPH and CiPOD copolymers. Consequently, the location and intensity of the different relaxation mechanisms as well as stiffness parameters (storage, Young's moduli, and microhardness) and deformation mechanism are strongly dependent upon composition.

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“…Usually butene, hexene, or octene are used as comonomers, but also longer olefins were utilized in recent years as comonomers, although such copolymers are not commercially available yet [4][5][6][7][8]. Another advantage of the single-site catalysts are their tendency to produce samples with a very homogeneous comonomer incorporation, which is not given for materials synthesized with ZN-catalysts or via the high pressure process [9][10][11]. By choosing a proper single-site catalyst and synthesis conditions, it is also possible to adjust the molar mass to almost any desired level with a narrow molar mass distribution (M w /M n =2) [12].…”

Section: Introductionmentioning

confidence: 99%

Lattice sizes, crystallinities, and spacing between amorphous chains - characterization of ethene-/ɑ-olefin copolymers with various comonomers and comonomer contents measured by wide angle X-ray scattering

Stadler¹,

Takahashi

Yonetake

2009

E-Polymers

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Ethene-/-olefin copolymers having a wide range of comonomer contents with comonomers between 4 and 26 carbon atoms in length were characterized by wide angle X-ray scattering (WAXS). It was found that the crystallinities matched fairly well with the crystallinities from DSC and volumetric measurements. An increase of the crystal lattice size was found with increasing comonomer content and comonomer length. Both are attributed to the formation of defects around these short-chain branches in the crystal lattice, which widen it. Increasing the cooling time will lead to a more densely packed crystal structure, if the quenched structure is distorted, i.e. if the sample contains comonomer. A higher molar mass M w widens the average space between chains in the amorphous phase as well as the addition of comonomer. The latter finding is explained by the increasing number of chain ends introduced by the comonomer which increases the free volume in the sample because of the worse amorphous packing of the chain ends.

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Influence of metallocene structures on ethene copolymerization with 1-butene and 1-octene

Cited by 95 publications

References 47 publications

Design of Efficient Molecular Catalysts for Synthesis of Cyclic Olefin Copolymers (COC) by Copolymerization of Ethylene and α-Olefins with Norbornene or Tetracyclododecene

Design of Efficient Molecular Catalysts for Synthesis of Cyclic Olefin Copolymers (COC) by Copolymerization of Ethylene and α-Olefins with Norbornene or Tetracyclododecene

Comonomer Length Influence on the Structure and Mechanical Response of Metallocenic Polypropylenic Materials

Lattice sizes, crystallinities, and spacing between amorphous chains - characterization of ethene-/ɑ-olefin copolymers with various comonomers and comonomer contents measured by wide angle X-ray scattering

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