isotactic การใช้

• These catalysts polymerize propylene and other 1-alkenes to highly crystalline isotactic polymers.
• Commercially available isotactic polypropylene is made with two types of Ziegler-Natta catalysts.
• Isotactic polybutylene crystallizes in three different forms.
• The mass fraction of isotactic ( mm ) triads is a common quantitative measure of tacticity.
• The isotactic polymer can be produced from optically active propylene oxide, but at a high cost.
• In "'hemi isotactic macromolecules "'every other repeat unit has a random substituent.
• PB-1 is a high molecular weight, linear, isotactic, and semi-crystalline polymer.
• Composed of an isotactic crystalline stereoisomer of polypropylene, Prolene sutures are intended to be durable and long lasting.
• With a Schrock catalyst modified with a BINOL ligand in a norbornadiene ROMP leading to highly stereoregular cis, isotactic polymer.
• Seeking to mimic that effect, Erbil's team dissolved a commercially available plastic _ isotactic polypropylene _ in a solvent.
• Commercial synthesis of isotactic polypropylene is usually carried out either in the medium of liquid propylene or in gas-phase reactors.
• Natta used crystalline ?-TiCl 3 in combination with Al ( C 2 H 5 ) 3 to produce first isotactic polypropylene.
• Different metal chlorides allowed the selective production of each form i . e ., syndiotactic, isotactic and atactic polymer chains could be selectively created.
• The isomer where all of the phenyl groups are on the same side is called " isotactic " polystyrene, which is not produced commercially.
• These include but are not limited to : semi-crystalline polyolefins, polyoxymethylene, and isotactic poly ( 4-methyl-1-pentene ).
• Most commercial polypropylene is isotactic and has an intermediate level of crystallinity between that of low-density polyethylene ( LDPE ) and high-density polyethylene ( HDPE ).
• Modern supported Ziegler-Natta catalysts developed for the polymerization of propylene and other 1-alkenes to isotactic polymers usually use as an active ingredient and as a support.
• Vandenberg is best known for his work at Hercules in the 1950s through the 1970s that included the independent discovery of isotactic polypropylene and the development of Ziegler-type catalysts.
• Such isotactic macromolecules coil into a helical shape; these helices then line up next to one another to form the crystals that give commercial isotactic polypropylene many of its desirable properties.
• Such isotactic macromolecules coil into a helical shape; these helices then line up next to one another to form the crystals that give commercial isotactic polypropylene many of its desirable properties.