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聚四亚甲基醚二醇PTMEG
A1. TYPICAL CHEMICAL & PHYSICAL PROPERTIES
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PTMEG
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1000
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1800
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2000
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3000
|
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Appearance
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A White Waxy solid, and may become transparent liquid over a room temperature
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|||
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Average Molecular weight
|
1000
|
1800
|
2000
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3000
|
|
Hydroxyl Number
|
112
|
62
|
56
|
37
|
|
Viscosity(Cps,40?
|
310
|
1240
|
1445
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4300
|
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Specific Gravity(40/4?
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0.975
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0.974
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0.974
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0.97
|
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Refractive Index
|
1.463
|
1.464
|
1.464
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1.464
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Melting Point(Tm, ?
|
24
|
28
|
32
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35
|
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Glass Transition Point(Tg, ?
|
-76
|
-76
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-76
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|
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Boiling Point(?
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more than 204
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|||
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Flash Pont(open cup, ?
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more than 260
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|||
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Alkalinity (m1N/1000HCL/30g)
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From -3.0 to+1.0
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|||
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Iron (wt ppm)
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Less than 1
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|||
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Solubility
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Readily soluble in alcohols, esters and ketones, aromatic and chlorinated hydrocarbons. Insoluble in aliphatic hydrocarbons and water. Has a tendency to decrease its solubility as molecular weight increase.
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|||
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Hygroscopicity
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These PTMEG are all hygroscopic. At room temperature, PTMEG can absorb up to 2wt% water depending on the molecular weight
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