Thiol-Michael Coupling and ROMP: Comparison of the Effects of Steric Hindrance with Functional Dendronized Polymer
- Resource Type
- Academic Journal
- Authors
- Tong Wu; Maojie Xuan; Xingyou Wang; Meina Liu
- Source
- 폴리머. 2019-11 43(6):807-815
- Subject
- thiol-Michael
ring-opening metathesis polymerization
functional polymer
steric hindrance
- Language
- Korean
- ISSN
- 0379-153X
2234-8077
Dendronized exo-7-oxanorbornene monomers were synthesized and polymerized via thiol-Michael coupling and ring-opening metathesis polymerization. The polymerization rate was highly dependent on the steric hindrance of the terminal group. The space linker between the polymerizable group and dendron was a crucial factor. Ru-based kinetics was investigated using nuclear magnetic resonance (NMR), which showed that the monomer was completely converted to a generally narrow polydispersity material. The second generation of functional macromonomer was grafted from the first with a different linker length and consumed completely at 50℃ in toluene. Considering the properties of the space linker, we found that a short space linker of dendronized exo-7-oxanorbornene macromonomer leads to narrow molecular weight distributions of obtained dendronized polymers. This work provides a further understanding of the effect of steric hindrance on dendronized polymers, thereby allowing the development of functional materials.