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<p>size When separate chains interact cooperatively, as in forming crystalline regions in <a href="page.php?w=solid">solid</a> thermoplastics, a different mathematical approach must be used.</p>

<p>Stiffer polymers such as <a href="page.php?w=alpha_helix">helical</a> polypeptides, <a href="page.php?w=Kevlar">Kevlar</a>, and double-stranded <a href="page.php?w=DNA">DNA</a> can be treated by the <a href="page.php?w=worm-like_chain">worm-like chain</a> model.</p>

<p>Even <a href="page.php?w=copolymer">copolymer</a>s with <a href="page.php?w=monomers">monomers</a></p><p>
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