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Polyvinyl Alcohol (China PVA)
CAS Number: 9002-89-5
Molecular Formula: C2
H4 O
Molecular Weight: 63800_114400
Specification:
| Specification |
1799 |
1788 |
| Alcoholysis degree |
98%-99.9% |
87%~89% |
| sodium acetate |
2.5% max |
1% max |
| volatile |
9% max |
8% max |
| ash |
0.7% max |
0.4% max |
| PH value |
7-10 |
5-7 |
| viscosity |
22-30 mpa.s |
20.5~24.5mpa.s |
Packing :20kgs/paper bag lined with palstic
,25MT/20’FCL.
Characteristics: Polyvinyl Alcohol is a kind of non-ionic
linear high polymer. It is non-toxic, non-smelly, and it looks white or light
yellow, in the form of floccules, flakiness and solid powder. Its molecular
formula is (C2 H4 O)n, of which "n" refers to the average degree of
polymerization and the molecular weight is 44n. The molecular formula of PVA
17-88 is (C2 H4 O)n-(C2 H6O)m, of which "n + m" is the average degree of
polymerization and the molecular weight is 44n+86m. The simulating specific
gravity of flocculent PVA is (0.21-0.30)g/cm3, while that of flaky PVA is
(0.47+-0.06)g/cm3.
Properties: Colorless, white or cream, amorphous
powder. MP: Decomp over 200° , flash p: 175° F (OC), d: 1.329. Sol in water.
Polymer of average molecular weight 120, 000 ( AMPLAO AMA Archives of Pathology.
67 (1959), 589. ).
Polyvinyl Alcohol has fairly good chemical stability,
insulativity and film-forming properties. It has typical chemical properties of
polyalcohol.
It can react with acid, ether and acetyl, and it can be
esterified, etherified and actualized
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