Efficient Molecular Weight Control with Trialkylaluminum in Ethylene/Norbornene Copolymerization by [Ph<sub>2</sub>C(Flu)(3‐MeCp)]ZrCl<sub>2</sub>/Methylaluminoxane Catalyst
Abstrak
AbstractEthylene/norbornene copolymerizations were conducted with [Ph2C(Flu)(3‐RCp)]ZrCl2 [R: Me (1) or Me3Si (2)], which give alternating EN copolymers. The activity of 1 in the absence of R3Al was approximately twice that of 2 and increased further upon addition of R3Al. Et3Al increased the activity most effectively, and the $\overline {M} _{{\rm n}} $ of the produced polymer decreased from 100 000 to 25 000 g · mol−1. On the other hand, the $\overline {M} _{{\rm n}} $ value increased upon addition of iBu3Al from 100 000 to 209 000 g · mol−1 accompanied by an ≈2.5‐fold increase of activity. Consequently, 1 was found to be one of the most promising complexes for the synthesis of alternating EN copolymers, of which $\overline {M} _{{\rm n}} $ value was efficiently controlled by the kind and the amount of R3Al added.magnified image
Penulis (4)
Tomoyuki Tada
Zhengguo Cai
Yuushou Nakayama
Takeshi Shiono
Akses Cepat
- Tahun Terbit
- 2010
- Bahasa
- en
- Total Sitasi
- 4×
- Sumber Database
- CrossRef
- DOI
- 10.1002/macp.201000172
- Akses
- Open Access ✓