1. A benzocyclobutenone (BCBO)-functional fluoropolymer.
2. A BCBO-functional fluoropolymer as recited in claim 1, comprising the reaction product of a BCBO compound and a hydroxyfuntional perfluoropolyether (PFPE).
3. A BCBO-functional fluoropolymer as recited in claim 2, wherein the BCBO compound has the formula
4. A BCBO-functional fluoropolymer as recited in claim 2, wherein the hydroxy-functional PFPE has (a) an Mn of 1,000 to 4,000, and (b) the formula
HO\u2014CH2\u2014CF2\u2014O\u2014(CF2\u2014CF2\u2014O)p\u2014(CF2\u2014O)q\u2014CF2\u2014CH2\u2014OH,
where pq=0.8 to 1.2.
5. A BCBO-functional fluoropolymer as recited in claim 2, wherein the hydroxy-functional PFPE has (a) an Mn of 1,000 to 4,000, and (b) the formula
HO\u2014CH2\u2014CF2\u2014O\u2014(CF2\u2014CF2\u2014O)p\u2014(CF2\u2014O)q\u2014CF2\u2014CH2\u2014OR,
where R is CH3 or C2H5 and pq=0.8 to 1.2.
6. A polymer comprising the reaction product of a BCBO-end-capped PFPE macromer and an acrylic copolymer.
7. A polymer as recited in claim 6, wherein the acrylic copolymer comprises a copolymer of ethyl methacrylate and hydroxyethyl acrylate.
8. A polymer as recited in claim 6, wherein the acrylic copolymer comprises a copolymer of ethyl methacrylate and hydroxyethyl methacrylate.
9. A polymeric composition comprising a BCBO-functional fluoropolymer.
10. A polymeric composition as recited in claim 9, wherein the BCBO-functional fluoropolymer is a perfluoropolyether (PFPE).
11. A polymeric composition as recited in claim 9, wherein the BCBO-functional fluoropolymer is a mono-BCBO-PFPE.
12. A polymeric composition as recited in claim 9, wherein the BCBO-functional fluoropolymer is a di-BCBO-PFPE.
13. A polymer or polymeric composition as recited in any one of preceding claims, in which said polymer or polymeric composition one is crosslinked.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A centrifugal compressing apparatus comprising:
an impeller having a hub having a hub surface and an impeller blade extending along said hub surface, said impeller having an impeller flow entrance and an impeller flow exit, wherein a height of the impeller blade of said impeller is configured to decrease gradually from a front edge thereof to a rear edge thereof; and
a casing configured to house the impeller, wherein
the impeller blade has a shroud surface having a shroud line configured to oppose the casing, wherein
the shroud line is configured to be convex at a rear edge of the impeller blade with respect to an intersection of a tangent drawn to the shroud line from a point P of an exit width L and the shroud line, wherein
the point P is an intersection of said shroud line with said rear edge of said impeller blade, said rear edge having a length forming a flow exit width of said impeller, wherein
said shroud line and point P are defined in a meridional surface.
2. The centrifugal compressing apparatus according to claim 1, wherein
the impeller blade is configured to have a convex portion bulging in the direction of enlarging the height of the impeller blade beyond a tangent TA1 at the rear edge of the impeller blade.
3. A centrifugal compressing apparatus comprising:
an impeller having a hub having a hub surface and an impeller blade extending along said hub surface, said impeller having an impeller flow entrance and an impeller flow exit such that a main air flow flows inside said impeller from said impeller flow entrance to said impeller flow exit, wherein a height of the impeller blade of said impeller decreases gradually and continuously from a front edge thereof to a rear edge thereof, said height being an amount of protrusion of said impeller blade from said hub surface in a direction orthogonal to the main air flow inside said impeller; and
a casing configured to house the impeller, wherein
the impeller blade has a shroud surface having a shroud line configured to oppose the casing, wherein
the shroud line is configured to be convex at a rear edge of the impeller blade with respect to an intersection of a tangent drawn to the shroud line from a point P of an exit width L and the shroud line, wherein
the point P is an intersection of said shroud line with said rear edge of said impeller blade, said rear edge having a length forming a flow exit width of said impeller, wherein
said shroud line and point P are defined in a meridional surface.
4. The centrifugal compressing apparatus according to claim 3, wherein
the impeller blade is configured to have a convex portion bulging in the direction of enlarging the height of the impeller blade beyond a tangent TA1 at the rear edge of the impeller blade.