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A gas separation module includes at least one inlet port, a plurality of outlet ports, and a plurality of hollow fiber membranes. Individual fibers have a feed end and a product end with a retentate interior side and a permeate exterior side. The module includes a feed tubesheet within the shell seg

A gas separation module includes at least one inlet port, a plurality of outlet ports, and a plurality of hollow fiber membranes. Individual fibers have a feed end and a product end with a retentate interior side and a permeate exterior side. The module includes a feed tubesheet within the shell segregating the at least one inlet port and the permeate side of the fibers. The feed tubesheet includes a matrix and at least one segment joint. The segment joint separates segments of the feed tubesheet from one another. A formation method includes positioning a hollow fiber membrane material in association with at least one tubesheet segment joint and applying a matrix. The method includes forming a feed tubesheet from cured matrix and the segment joint and forming a plurality of hollow fiber membranes from the fiber material. The segment joint separates segments of the feed tubesheet from one another.

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1. A gas separation module comprising: an external shell having at least one inlet port and a plurality of outlet ports;a plurality of hollow fiber membranes within the shell, individual fibers having a feed end and a product end with a retentate interior side and a permeate exterior side between th

1. A gas separation module comprising: an external shell having at least one inlet port and a plurality of outlet ports;a plurality of hollow fiber membranes within the shell, individual fibers having a feed end and a product end with a retentate interior side and a permeate exterior side between the feed end and the product end;a feed tubesheet within the shell securing the feed end of the fibers and segregating the at least one inlet port and the permeate exterior side of the fibers; andthe feed tubesheet including a matrix and at least one segment joint, the matrix encapsulating the feed end of the fibers, and the segment joint containing a compliance material different from the matrix and separating a plurality of segments of the feed tubesheet from one another. 2. The module of claim 1 wherein the gas separation module is an air separation module comprised by an aircraft fuel tank flammability reduction system, the system further comprising: a source for air to the at least one inlet port; anda fuel tank on board the aircraft to receive retentate, which contains nitrogenenriched air. 3. The module of claim 1 wherein: the plurality of outlet ports comprises at least one outlet port to exhaust retentate from the product end of the fibers;the module further comprises a product tubesheet within the shell securing the product end of the fibers and segregating the permeate side of the fibers and the at least one outlet port; andthe product tubesheet includes a matrix and at least one segment joint, the matrix encapsulating the product end of the fibers, the segment joint containing a compliance material different from the matrix and separating a plurality of segments of the product tubesheet from one another, and the segment joint in the feed tubesheet being separate from the segment joint in the product tubesheet. 4. The module of claim 3 wherein the respective segment joints in the feed and product tubesheets do not extend between the feed and product tubesheets. 5. The module of claim 1 wherein the feed tubesheet exhibits a rectangular perimeter around the feed end of the fibers. 6. The module of claim 1 wherein the fibers are arranged in one or more bundles, individual bundles having a segment of a tubesheet with a rectangular perimeter at the feed end and a segment of a tubesheet with a rectangular perimeter at the product end. 7. The module of claim 1 wherein the at least one segment joint comprises a facesheet sealing the compliance material from the matrix. 8. The module of claim 7 wherein the facesheet comprises a treated surface enhancing bonding with the matrix. 9. The module of claim 1 wherein the feed tubesheet further comprises a thermoplastic veil between layers of the plurality of hollow fiber membranes, the thermoplastic veil containing a material different from the matrix and increasing toughness of the feed tubesheet. 10. A gas separation module comprising: an external shell having at least one inlet port and a plurality of outlet ports;a plurality of hollow fiber membranes within the external shell, individual fibers having a feed end and a product end with a retentate interior side and a permeate exterior side between the feed end and the product end;a feed tubesheet within the external shell securing the feed end of the fibers and segregating the at least one inlet port and the permeate side of the fibers;the feed tubesheet including a matrix and a plurality of segment joints, the matrix containing an adhesive or a resin or both, the matrix encapsulating the feed end of the fibers, and the segment joints containing a compliance material different from the matrix and separating a plurality of segments of the feed tubesheet from one another;a plurality of facesheets sealing respective segment joints from the matrix; anda rim containing the matrix around the feed tubesheet. 11. The module of claim 10 wherein the gas separation module is an air separation module comprised by an aircraft fuel tank flammability reduction system. 12. The module of claim 10 wherein the feed tubesheet exhibits a rectangular perimeter around the feed end of the fibers. 13. The module of claim 10 wherein the feed tubesheet contains four to eight segment joints. 14. The module of claim 10 wherein the matrix further comprises nanosilica particles. 15. The module of claim 14 wherein the nano-silica particles range from 50 to 150 nanometers. 16. The module of claim 14 wherein a volume fraction of the nano-silica particles in the matrix is less than or equal to 40%. 17. The module of claim 10 wherein the plurality of facesheets include a treated surface enhancing bonding with the matrix. 18. The module of claim 10 wherein the rim further comprises carbon fibers or nano-silica particles or both structurally reinforcing the rim. 19. The module of claim 10 wherein the feed tubesheet further comprises a thermoplastic veil between layers of the plurality of hollow fiber membranes, the thermoplastic veil containing a material different from the matrix and increasing toughness of the feed tubesheet. 20. A feed tubesheet of a gas separation module comprising: a plurality of hollow fiber membranes, individual fiber membranes having a feed end and a product end;a matrix encapsulating the feed end of the fiber membranes;at least one tubesheet segment joint separating a plurality of segments of the feed tubesheet from one another, the at least one feed tubesheet segment joint including a compliance material different from the matrix; anda thermoplastic veil between layers of the plurality of hollow fiber membranes, the thermoplastic veil including a material different from the matrix and increasing toughness of the feed tubesheet.