The present invention relates to a process for the preparation of a block copolymer comprising a first type of polyolefin block and at least one type of second polymer block, the process comprising the steps of:
A) polymerizing at least one type of olefin monomer using a catalyst system to obtain a first polyolefin block containing a main group metal on at least one chain end; the catalyst system comprising:
i) a metal catalyst or metal catalyst precursor comprising a metal from Group 3-10 of the IUPAC Periodic Table of elements; and
ii) at least one type of chain transfer agent; and
iii) optionally a co-catalyst;
B) reacting the first polyolefin block containing a main group metal on at least one chain end obtained in step A) with at least one type of oxidizing agent and subsequently at least one type of metal substituting agent to obtain a first polyolefin block containing at least one functionalized chain end;
C) forming at least one second polymer block on the first polyolefin block, wherein as an initiator the functionalized chain end of the first polyolefin block obtained in step B) is used to obtain the block copolymer.
本发明涉及一种制备嵌段共聚物的工艺,该嵌段共聚物包括第一种聚烯烃嵌段和至少一种第二种聚合物嵌段,该工艺包括以下步骤:
A) 使用催化剂体系聚合至少一种烯烃单体,以获得至少一个链端含有主族
金属的 第一种聚烯烃嵌段;催化剂体系包括
i)
金属催化剂或
金属催化剂前体,包含 IU
PAC 元素周期表第 3-10 族
金属;和
至少一种链转移剂;以及
iii) 可选的助催化剂;
B)将步骤 A)中获得的至少一个链端含有主族
金属的第一聚烯烃嵌段与至少一种氧化剂和随后的至少一种
金属取代剂反应,以获得含有至少一个官能化链端的第一聚烯烃嵌段;
C) 在第一聚烯烃嵌段上形成至少一个第二聚合物嵌段,其中使用步骤 B) 中获得的第一聚烯烃嵌段的功能化链端作为
引发剂,以获得嵌段共聚物。