| 摘要 |
1,268,093. Two-phase polysiloxane-polyarylene ether copolymers. UNION CARBIDE CORP. 21 March, 1969 [21 March, 1968], No. 14895/69. Heading C3T. A siloxane-polyarylene polyether block copolymer comprises (A) at least one siloxane chain having at least 2 units RbSiO 4-b/2 wherein R is a monovalent substituted or unsubstituted hydrocarbon group, or a divalent organic group or oxygen atom of which the second valency is attached to a polyarylene polyether chain, providing a C-Si link or an aryloxysilicon link respectively, at least one R per siloxane chain being such a linking group or oxygen atom, and b is 1, 2 or 3; and (B) at least one polyether chain having recurring units -O-E-O-E<SP>1</SP>- wherein E is a residue of a dihydric phenol and E<SP>1</SP> is a residue of a benzenoid compound carrying an inert electronwithdrawing group o or p to the valence bonds of sigma* value above + 0.7, and the oxygen atoms are attached to aromatic carbon atoms, the siloxane and polyether chains each having a molecular weight such that the polymer is a two-phase material. Suitable starting materials and preparations are listed and are as described in the copending Specification 1,268,091 and 1,268,092. In examples excess bisphenol A is condensed with 4:4-dichlorodiphenylsulphone and the product polyether is reacted with a dimethylamino-terminated polydimethylsiloxane; in Examples 7-13 this is varied: by using as diphenol: diphenylol sulphone (7), the bisphenol from benzophenone (8) or vinyl cyclohexene (9), hydroquinone (11) or reaorcinol (13); as benzenoid dihalide: 4:41-difluorobenzophenone (10 and 11), 2:5-dichloronitrobenzene (12), and 4:4<SP>1</SP>-dichloro-azobenzene (13); excess dihalide being used in Examples 8, 10 and 12; the polysiloxane end groups being mercapto (8), bromalkyl (9), alkali metal silanolate (10), aminoalkyl (12) or isocyanato groups (13); and the polysiloxane chains having methylphenylsiloxane (8) or diphenylsiloxane (9) or 3% of vinylmethylsiloxane units (13). The polyether segments have molecular weights of 4,600 to 20,000 and the polysiloxane segments 4,900 to 10,000; all the polymers have two glass transition temperatures. |
