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 network perfection with the resulting superior mechanical properties at both room and elevated temperatures, while, as stated, the substantially complete lack of {TAIL ~ ethylenic unsaturation} in the interior I blocks provides for a high degree of {HEAD ~ oxidative and thermal stability} 
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 network perfection with the resulting superior mechanical properties at both room and elevated temperatures , while , as stated , the substantially complete lack of { TAIL ~ ethylenic unsaturation } in the interior I blocks provides for a high degree of { HEAD ~ oxidative and thermal stability }
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