Chemical & Physical Information
Common Names | Polyester staple fibre, Y-cool Cotton Fibre (Cotton Type Hollow Fibre) |
Structure | (C27H22O4S)n ![](https://www.ascent-petrochem.com/wp-content/uploads/2023/02/High-Shrinkage-Staple-Fibre-manufacture.gif) |
CAS No. | 25135-51-7 | Melting point (℃) | 185 °C |
Molecular Weight | 1327.58 | Density | 1.24 g/mL at 25 °C(lit.) |
Appearance | White fibre | Refractive index | 1.633 |
HS Code | 39119000 | Autoignition Temperature | 550°C |
Solubility | Soluble in dichloromethane, dichloroethane, chloroform, chlorobenzene, benzene, toluene. | Glass transition temperature | 150 ℃ |
Safety Information
Safety Statement (Europe) |
S24/25 |
RIDADR |
NONH for all modes of transport |
Water hazard class (WGK) |
3 |
Personal protective equipment |
Eyeshields;Gloves;type N95 (US);type P1 (EN143) respirator filter |
|
FIRST AID |
Inhalation |
If breathed in, move person into fresh air. If not breathing, give artificial respiration. |
Skin |
Wash off with soap and plenty of water. |
Eyes |
Flush eyes with water as a precaution. |
Inhalation |
Never give anything by mouth to an unconscious person. Rinse mouth with water. |
Synthetic Route
Polysulfone is polymerized from dialkali metal salts of diphenols (such as bisphenol A disodium salt) and active aromatic dihalides (such as 4,4`-dichlorodiphenyl sulfone).
The production of polysulfone usually adopts Farnham’s nucleophilic substitution reaction. From the perspective of polymer synthesis, the production process of polysulfone products almost adopts the nucleophilic substitution polycondensation route in the industrial synthesis method.
The production method has a one-step method and a two-step method. The two-step synthesis reaction is to generate bisphenol A disodium salt by in-situ reaction of bisphenol A and alkali, and then nucleophilic with 4,4`-dichlorodiphenyl sulfone Substitution reaction. The one-step synthesis of polysulfone is to use potassium bicarbonate or potassium carbonate instead of sodium hydroxide to synthesize polysulfone. This method can shorten the synthesis steps, avoid the dehydration process, and shorten the reaction time. It has great potential in increasing the output, but the current production Still use the two-step method to complete. |