The selectively hydrogenated block copolymers of this invention contain sufficient unsaturation in the terminal D blocks so that they may be adequately vulcanized to provide near {HEAD ~ network perfection} with {TAIL ~ the resulting superior mechanical properties} at both room and elevated temperatures, while, as stated, the substantially complete lack of ethylenic unsaturation in the interior I blocks provides for a high degree of oxidative and thermal stability 
with
The selectively hydrogenated block copolymers of this invention contain sufficient unsaturation in the terminal D blocks so that they may be adequately vulcanized to provide near { HEAD ~ network perfection } with { TAIL ~ the resulting superior mechanical properties } at both room and elevated temperatures , while , as stated , the substantially complete lack of ethylenic unsaturation in the interior I blocks provides for a high degree of oxidative and thermal stability
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