نتایج جستجو برای: cycloolefin copolymers

تعداد نتایج: 8627  

Journal: :polyolefins journal 2014
laura boggioni incoronata tritto

highly active metallocenes and other single site catalysts have opened up the possibility of polymerizing cycloolefins such as norbornene (n) or of copolymerizing them with ethene (e) or propene (p). the polymers obtained show exciting structures and properties. e-n copolymers are industrially produced materials, with variable and high glass transitions depending on the wide range of their micr...

2004
Pralay Maiti Masami Okamoto

Development of structures in new cycloolefin copolymers (COCs) of ethylene–norbornene (E–NB) and ethylene–tetracyclododecene (E–TD) of different NB/TD compositions were investigated under uniaxial elongational flow. For E–NB copolymer, which has multiblock sequences, a shoulder in WAXD at 0.76 nm was evident besides its amorphous halo, and the relative intensity of the peak increased with incre...

Journal: :Physiological research 2010
M Polanská H Hulejová M Petrtýl Z Bastl I Spirovová Z Krulis Z Horák D Veigl L Senolt

Materials on the basis of cycloolefin copolymers (COC) are suitable for subchondral defect repairs. The objective of this study was to evaluate the influence of surface modification of COC and COC/LLDPE blends on the viability and gene expression of chondrocytes. Human chondrocytes were incubated on the surface of the studied materials. Half of the materials were plasmatically modified with a s...

Journal: :Chinese Physics 2022

A novel terahertz polarization beam splitter (PBS) with low loss and large bandwidth based on double core negative curvature fiber is designed. The device takes copolymers of cycloolefin as the substrate, 12 circular tubes embedded are evenly distributed along circumference. divided into two cores through groups circumscribed small clad symmetrical up down. finite-difference time-domain (FDTD) ...

Journal: Polyolefins Journal 2014

Highly active metallocenes and other single site catalysts have opened up the possibility of polymerizing cycloolefins such as norbornene (N) or of copolymerizing them with ethene (E) or propene (P). The polymers obtained show exciting structures and properties. E-N copolymers are industrially produced materials, with variable and high glass transitions depending on the wide range of their micr...

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