What is metallocene polymer?
Metallocenes are very effective metal catalyst. They consist of minute particles of positively charged metal ions sandwiched between two cyclopentadienyl anions, which have five atoms per ring. Many derivatives of early metallocenes are active catalysts for olefin polymerization.
What is metallocene polypropylene?
In comparison with the Ziegler–Natta-catalyzed polypropylene (PP), metallocene polypropylenes are uniform polymers with precisely controlled Mw, end groups, stereoregularity, and narrow PDI [6]. Those characters make metallocene-based iPP a great candidate for producing high-quality industrial fibers by melt spinning.
What are metallocenes examples?
The most famous example is ferrocenium, [Fe(C5H5)2]+, the blue iron(III) complex derived from oxidation of orange iron(II) ferrocene (few metallocene anions are known).
What are metallocenes used for?
Metallocenes have been used as chemical intermediates, antiknock additives to gasoline, lubricants, and for other uses, but a primary application is as catalysts in the plastics industry. Metallocenes are also currently being investigated as a cancer, malaria, and bacterial infection treatment agents.
What is mLLDPE?
The SABIC® SUPEER™ Metallocene Linear Low Density Polyethylene (mLLDPE) is a metallocene ethylene-hexene copolymer. Films produced with this grade offer excellent mechanical, optical, sealability, processability and organoleptic properties.
Which of the following is an example of bent metallocene?
In organometallic chemistry, bent metallocenes are a subset of metallocenes. In bent metallocenes, the ring systems coordinated to the metal are not parallel, but are tilted at an angle. A common example of a bent metallocene is Cp2TiCl2.
Who is prepared the metallocenes?
The Boulder Scientific Company, located in Mead, Colorado, has been producing metallocenes commercially for over 15 years.
What is the difference between mLLDPE and LLDPE?
LLDPE has a higher resistance to tensile and impact than LDPE, and a resistance to breakage much better than this one. It is very flexible and elastic. It can be used to produce a thinner film, with a better resistance to stress. LLDPE made by the use of metallocene catalysts is labeled as mLLDPE.
Is LDPE a good moisture barrier?
Fair moisture barrier can be achieved with monolayer LDPE grades. Polyethylene and polypropylene have poor oxygen (gas) barrier but good-moderate moisture barrier properties.
What is Vldpe?
Very low density polyethylene (VLDPE) is a type of polyethylene having a density in the range of 0.890 – 0.914 g/cm3. Like LLDPE, it is produced by low pressure polymerization techniques using metallocene catalysts. This resin has a higher alpha-olefin content than the other types of polyethylene.