Polyarylene polyethers with pendant vinyl and ethynyl groups and process for preparation thereof
First Claim
1. A polyfunctionalized substantially linear crosslinkable thermoplastic polyarylene polyether oligomer, or polyarylene polythioether (PAPE) oligomer having at least two pendant vinyl groups in said oligomer represented by a formula selected from:
- wherein,R represents O or S in an ether linkage with Re or Re'"'"' ;
Re represents the residuum of a terminal dihydric phenol or dihydric thiophenol DH(T)P monomer having a terminal phenol, thiophenol or halophenyl group;
Re'"'"' represents the residuum of a terminal monohydric phenol MHP monomer having a terminal substituted phenol group;
"PAPE" represents the residuum of the PAPE oligomer which is selected from the group consisting of an oligomer of a monohydric 2,6-disubstituted phenol, and an oligomer of at least one mononuclear or polynuclear DH(T)P monomer in which oligomer each phenyl ring is connected to another through an O, Si, C or S atom; and
,the vinyl group (--CH═
CH2) is connected to an electron-rich phenyl ring in the backbone of said PAPE.
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Abstract
A method for the synthesis of polyarylene polyether (PAPE) oligomers with pendant vinyl groups is presented. Aromatic polyether sulfone (APS) and poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) backbones are used for specific examples. Terminal vinyl groups may also be provided on the APS by forming the α, ω-di(benzyl)APS before the first step of a synthesis to form a pendant groups which step involves the chloromethylation of APS and PPO to provide oligomers with chloromethyl groups. PPO containing bromomethyl groups was obtained by radical bromination of the PPO methyl groups. Both chloromethylated and bromomethylated starting materials are converted to their phosphonium salts, and then subjected to a phase transfer catalyzed Wittig reaction to provide the pendant vinyl groups. An APS containing pendant ethynyl groups is prepared by bromination of the APS with pendant vinyl groups, followed by a phase transfer catalyzed dehydrobromination. Differential scanning calorimetry analysis of the thermal curing of the oligomers containing pendant vinyl groups, and, ethynyl groups, showed that the curing reaction is much faster for the former. The resulting network polymers were flexible when the starting oligomer contained pendant vinyl groups, and very rigid when it contained pendant ethynyl groups.
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Citations
55 Claims
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1. A polyfunctionalized substantially linear crosslinkable thermoplastic polyarylene polyether oligomer, or polyarylene polythioether (PAPE) oligomer having at least two pendant vinyl groups in said oligomer represented by a formula selected from:
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wherein, R represents O or S in an ether linkage with Re or Re'"'"' ; Re represents the residuum of a terminal dihydric phenol or dihydric thiophenol DH(T)P monomer having a terminal phenol, thiophenol or halophenyl group; Re'"'"' represents the residuum of a terminal monohydric phenol MHP monomer having a terminal substituted phenol group; "PAPE" represents the residuum of the PAPE oligomer which is selected from the group consisting of an oligomer of a monohydric 2,6-disubstituted phenol, and an oligomer of at least one mononuclear or polynuclear DH(T)P monomer in which oligomer each phenyl ring is connected to another through an O, Si, C or S atom; and
,the vinyl group (--CH═
CH2) is connected to an electron-rich phenyl ring in the backbone of said PAPE. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 50, 51, 52, 53, 54)
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24. A polyfunctionalized substantially linear crosslinkable thermoplastic polyarylene polyether oligomer, or polyarylene polythioether (PAPE) oligomer having at least two pendant ethynyl groups in said oligomer represented by a formula selected from:
- ##STR29## wherein, R represents O or S in an ether linkage with Re or Re'"'"' ;
Re represents the residuum of a terminal dihydric phenol or dihydric thiophenol DH(T)P monomer having a terminal phenol, thiophenol or halophenyl group; Re'"'"' represents the residuum of a terminal monohydric phenol MHP monomer having a terminal substituted phenol group; "PAPE" represents the residuum of the PAPE oligomer which is selected from the group consisting of an oligomer of a monohydric 2,6-disubstituted phenol, and an oligomer of at least one mononuclear or polynuclear DH(T)P monomer in which oligomer each phenyl ring is connected to another through an O, Si, C or S atom; and
,the ethynyl group (--C.tbd.CH) is connected to an electron-rich phenyl ring in the backbone of said PAPE. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48)
- ##STR29## wherein, R represents O or S in an ether linkage with Re or Re'"'"' ;
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49. A process for forming a polyfunctionalized substantially linear crosslinkable thermoplastic polyarylene polyether oligomer, or polyarylene polythioether oligomer, (PAPE oligomer), having pendant vinyl groups in each oligomer chain, said process comprising,
(a) reacting a PAPE oligomer having a molecular weight Mn in the range from about 1000 to about 100,000, with a halomethylating agent in a first solvent for said PAPE oligomer and said halomethyalting agent, in the presence of a Lewis acid catalyst so as to introduce at least two pendant halomethyl groups on electron-rich phenyl groups in said PAPE oligomer and yield a halomethylated PAPE oligomer; -
(b) reacting said halomethylated PAPE oligomer with triphenyl phosphine in solution with a second solvent, the same as or different from said first solvent, so as to yield the phosphonium salt of said halomethylated PAPE oligomer; (c) reacting said phosphonium salt with a lower aliphatic aldehyde in the presence of aqueous alkali and an organic phase solvent for said phosphonium salt so as to yield at least two pendant vinyl groups on the backbone of said PAPE oligomer; (d) precipitating said polyfunctionalized PAPE oligomer from said organic phase; and
,(e) recovering said polyfunctionalized PAPE oligomer. - View Dependent Claims (55)
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Specification