polymers, and functional building blocks. The method provides a straightforward and versatilesynthesis of isopropenyl ethers, features excellent tolerance of diverse functional groups, applies to a wide range of substrates, and allows scalable synthesis. The development of this organocatalytic transisopropenylation approach enables access to modular preparation of various acid-sensitive ketal-linked prodrugs
Core-hydrogenated block copolymers having an asymmetric structure
申请人:——
公开号:US20040132943A1
公开(公告)日:2004-07-08
Ring-hydrogenated block copolymers composed of vinylaromatic monomers and dienes having at least two S blocks with differing molar mass composed of vinylaromatic monomers, mixtures with ring-hydrogenated polystyrene, and a process for their preparation.
由乙烯基芳香族单体和二烯组成的环氢化嵌段共聚物,其中至少有两个由乙烯基芳香族单体组成的摩尔质量不同的 S 嵌段、与环氢化聚苯乙烯的混合物及其制备工艺。
Transparent mixtures of linear styrene-butadiene block copolymers
申请人:Knoll Konrad
公开号:US20060128890A1
公开(公告)日:2006-06-15
Mixtures comprising linear block copolymers composed of vinylaromatic monomers and dienes of the structure (I) S
1
-B
1
-S
2
and (II) B
2
-S
3
, where S
1
is a block composed of vinylaromatic monomers whose number-average molar mass M
n
is in the range from 40 000 to 1 00 000 g/lmol, each Of S
2
and S
3
is a block composed of vinylaromatic monomers whose number-average molar mass M
n
is in the range from 5000 to 20 000 g/mol, each of B
1
and B
2
is one or more blocks composed of dienes or is copolymer blocks composed of dienes and vinylaromatic monomers whose number-average molar mass M
n
is in the range from 15 000 to 100 000 g/mol, and the ratio of block copolymers (I)/(II) is in the range from 0.5 to 10, and their use for impact-modification of blends using polystyrene.