Preparation of ultrahigh molecular weight syndiotactic poly(vinyl alcohol) microfibrillar fibers by low-temperature solution polymerization of vinyl pivalate in tertiary butyl alcohol and saponification

2002 ◽  
Vol 85 (9) ◽  
pp. 1992-2003 ◽  
Author(s):  
Won Seok Lyoo ◽  
Sam Soo Kim ◽  
Han Do Ghim ◽  
Jae Pil Kim ◽  
Sang-Seob Lee
Keyword(s):  
Molecular Weight ◽  
Low Temperature ◽  
Vinyl Alcohol ◽  
Butyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Tertiary Butyl Alcohol ◽  
Solution Polymerization ◽  
Tertiary Butyl ◽  
Ultrahigh Molecular Weight ◽  
Temperature Solution

Preparation of high molecular weight poly(vinyl alcohol) with high yield using low-temperature solution polymerization of vinyl acetate

2001 ◽  
Vol 80 (7) ◽  
pp. 1003-1012 ◽  
Author(s):  
Won Seok Lyoo ◽  
Sung Soo Han ◽  
Jin Hyun Choi ◽  
Han Do Ghim ◽  
Sang Woo Yoo ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Low Temperature ◽  
High Molecular Weight ◽  
Vinyl Acetate ◽  
Vinyl Alcohol ◽  
High Yield ◽  
Poly Vinyl Alcohol ◽  
Solution Polymerization ◽  
Temperature Solution ◽  
High Molecular Weight Poly

Characterizations of poly(vinyl pivalate) polymerized in tertiary butyl alcohol and resulting syndiotactic poly(vinyl alcohol) microfibrils saponified

Polymer ◽  
2001 ◽  
Vol 42 (14) ◽  
pp. 6317-6321 ◽  
Author(s):  
Won Seok Lyoo ◽  
Joon Ho Kim ◽  
Han Do Ghim
Keyword(s):  
Vinyl Alcohol ◽  
Butyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Tertiary Butyl Alcohol ◽  
Tertiary Butyl

Rheological properties of syndiotacticity-rich ultrahigh molecular weight poly(vinyl alcohol) dilute solution

2001 ◽  
Vol 82 (3) ◽  
pp. 569-576 ◽  
Author(s):  
Jin Hyun Choi ◽  
Won Seok Lyoo ◽  
Sohk Won Ko
Keyword(s):  
Molecular Weight ◽  
Rheological Properties ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Dilute Solution ◽  
Ultrahigh Molecular Weight

scholarly journals Hexamer formation in tertiary butyl alcohol (2-methyl-2-propanol, C4H10O)

2006 ◽  
Vol 62 (4) ◽  
pp. 599-605 ◽  
Author(s):  
Pamela A. McGregor ◽  
David R. Allan ◽  
Simon Parsons ◽  
Stewart J. Clark
Keyword(s):  
High Pressure ◽  
Low Temperature ◽  
Phase Ii ◽  
Density Functional ◽  
Ambient Pressure ◽  
Chair Conformation ◽  
Butyl Alcohol ◽  
Tertiary Butyl Alcohol ◽  
Tertiary Butyl ◽  
Phase Iv

The crystal structure of phase II of tertiary butyl alcohol (2-methyl-2-propanol, C4H10O) has been solved using a combination of single-crystal X-ray diffraction techniques and ab initio density functional calculations. This trigonal P\overline 3 phase, which is stable at both low temperature and high pressure, and the triclinic P\overline 1 phase (phase IV) have very similar enthalpies, the calculations revealing only a 3.859 kJ mol−1 enthalpy difference at ambient pressure, despite the substantial change of the intermolecular bonding motif from helical catemer to hexamer with an increase in pressure or reduction in temperature. The hexamers in the trigonal phase adopt a chair conformation. There are two unique hexamers: at low temperature these are centred at (0, 0, 1\over2) and (2\over3, 1\over3, 0.961 (13)), and at high pressure the centres are (0, 0, 1\over2) and (2\over3, 1\over3, 0.958 (14)). A slight flattening of the hexamers is observed at high pressure and the calculations confirm that phase II becomes more stable relative to phase IV on pressure increase.

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