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Molecular weights of polyethylene and polypropylene by vapor pressure osmometry at elevated temperatures

โœ Scribed by J. W. Mays; E. G. Gregory

Publisher
John Wiley and Sons
Year
1987
Tongue
English
Weight
244 KB
Volume
34
Category
Article
ISSN
0021-8995

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โœฆ Synopsis

The Wescan Model 232-A' VPO was modified with a 12 volt regulated power supply for supplying bridge current and with thermocouples to allow for direct digital readout of the syringe box and measuring chamber temperatures. The modified instrument was used to measure m,, of standard (NBS) polyethylenes. Agreement with NBS values was good (within 10%) for a,, < 3 X lo4 and fair (within 20%) for a,, = 1 x lo5. Results on @, , of commercial polypropylenes are also reported.

๐Ÿ“œ SIMILAR VOLUMES

Molecular weight of polyethylene glycols
Molecular weight of polyethylene glycols by vapor pressure osmometry: An alternative data treatment
โœ E. Sabadini; E.M. Assano; T.D.Z. Atvars ๐Ÿ“‚ Article ๐Ÿ“… 1997 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 197 KB ๐Ÿ‘ 1 views

In this work, we determined the number average molecular weight of some polyethylene glycols (PEGs) using vapor pressure osmometry. In general, this technique works with a plot of Dr p /c p versus c p (concentration) and the molecular weight is determined by the calibration constant obtained from th