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, {HEAD ~ the substantially complete lack} of ethylenic unsaturation in the interior I blocks provides for {TAIL ~ a high degree} of oxidative and thermal stability 
provides for
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 , { HEAD ~ the substantially complete lack } of ethylenic unsaturation in the interior I blocks provides for { TAIL ~ a high degree } of oxidative and thermal stability
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