Structural Differences Between Similar Commercial Grades of Polyvinyl Alcohol-Acetate
✍ Scribed by Dunn, Alexander S. ;Naravane, Shreeang R.
- Book ID
- 104527086
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 2007
- Tongue
- English
- Weight
- 313 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0007-1641
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✦ Synopsis
Abstract
The properties of ostensibly similar grades of polyvinyl alcohol‐acetate are often found to be drastically different: for example, the viscosity of a polyvinyl acetate latex prepared using polyvinyl alcohol in the emulsifier system was reduced by half when a different sample of polyvinyl alcohol was used, yet the polyvinyl alcohols appeared to be identical in most respects. However, when the { ^1^ H } −^13^C n.m.r. spectra were obtained under identical conditions it was found that the ratio of the intensities of the methine and methylene resonances differed. This is attributable to a difference in the extent of short‐chain non‐hydrolysable branching.