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Unformatted text preview: -5"'_=" . 2.4. Carbon Fiber: 1? LEIU [d
D Young’s modulus [EN “1.21, [1
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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
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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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- Fall '11