| 摘要 |
<p>The present invention relates to a block copolymer containing 1-50 first polymer segments and 1-50 second polymer segments. Each first polymer segment has an average mole fraction of monomers possessing a branch point of 0.0001 to 1, whereas each second polymer segment has an average mole fraction of monomers possessing a branch point of 0 to 0.5. The average molecular weights range from 5-2,000 kDa for the first polymer segments, which constitute 5-95 % by weight of the block copolymer. The average molecular weights also range from 5-2,000 kDa for the second polymer segments, which constitute 5-95 % by weight of the block copolymer. The ratio of the average mole fraction of monomers possessing a branch point of the second polymer segments to that of the first polymer segments is 0 to 0.5.</p> |
