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mae482&582 fibers--graphite, kevlar, cellulose

mae482&582 fibers--graphite, kevlar, cellulose -...

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Unformatted text preview: -5"'_=" . 2.4. Carbon Fiber: 1? LEIU [d D D Young’s modulus [EN “1.21, [1 12m 1500 1500 2100 24GD°CETUU Heat treatment temperature li'l:+ 2.1T. Strength and elastic medium of carbon fiber as a function of final heat treannmt temperature. [fitter Wall “Will, need with permission] weak \ +rom bov'J,'nS (CGVQICn‘ Lab‘d‘} m O‘Hallc I [1439 \\ *' ’ fwk‘al‘fimtzd, e3. insular“ , Q: HOW “\cou“ Ionaz'l‘kclllnb-Q V" +M43V€AF€ fPOpcrffer.) ROM 26,08,053 CG/M/oso («Mir C 9//u/o:e SleQmol - ho ragga! Plan’s] Laud" HO‘k‘ H Lending? Wig/"LN.” (final: +0 SfmingYn mafia/(j 0M4 between Wad/Pride: w Cellulose is a straight chain polymer: unlike starch, no coiling or branching occurs, and the molecule adopts an extended and rather _st_if‘f rod-like Winn, aided by the equatorial conformation of the glucose residues. The multiple hydroxyl groups on the glucose residues from one chain form hydrogen bonds with oxygen molecules on the same or on a neighbor chain, holding the chains firmly together side-by-side and forming microZz:brils with high tensile strength. This strength is important in cell walls, where the microfibrils are meshed into a carbohydrate matrix, conferring rigidity to plant cells. BUT:.SowgmicmLer (“II IL) LOVE cellulose (for dinner); '0” groups are Very hydrdphi/[C Show +0 'foz ...
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