Synthesis of Side Chain Liquid Crystal Polymers by Living Ring Opening Metathesis Polymerization. 1. Influence of Molecular Weight, Polydispersity, and Flexible Spacer Length (n=2-8) on the Thermotropic behavior of the Resulting Polymers

1992 ◽  
Author(s):  
Zen Komiya ◽  
Coleen Pugh ◽  
Richard R. Schrock
Keyword(s):  
Molecular Weight ◽  
Liquid Crystal ◽  
Ring Opening ◽  
Side Chain ◽  
Liquid Crystal Polymers ◽  
Ring Opening Metathesis Polymerization ◽  
Spacer Length ◽  
Metathesis Polymerization ◽  
Flexible Spacer

A high performance polybenzoxazine via smart ortho-norbornene functional benzoxazine monomer based on ring-opening metathesis polymerization

2018 ◽  
Vol 31 (5) ◽  
pp. 513-520 ◽  
Author(s):  
Kan Zhang ◽  
Yuqi Liu ◽  
Yuting Wang ◽  
Lin Sun
Keyword(s):  
Molecular Weight ◽  
Ring Opening ◽  
High Performance ◽  
Average Molecular Weight ◽  
Side Chain ◽  
Resonance Spectroscopy ◽  
Thermal Curing ◽  
Ring Opening Metathesis Polymerization ◽  
Scanning Calorimetry ◽  
Metathesis Polymerization

Monofunctional benzoxazine with ortho-norbornene functionality ( oHPNI-a) has been synthesized via Mannich condensation. The benzoxazine monomer containing norbornene group can be polymerized by ring-opening metathesis polymerization (ROMP) to form a side-chain benzoxazine functionalized polynorbornene (poly( oHPNI-a)side) with number-average molecular weight 3840 and weight-average molecular weight 7290. The structures of synthesized monomer and side-chain functionalized linear polymer have been confirmed by 1H nuclear magnetic resonance spectroscopy and Fourier transform infrared (FTIR) spectroscopy. The further thermal curing polymerization mechanisms of poly( oHPNI-a)side are monitored by in situ FTIR and differential scanning calorimetry (DSC). Activation energy of polymerization for poly( oHPNI-a)side is also studied by DSC. The polybenzoxazine obtained by ROMP and further thermally activated ring-opening polymerization exhibits much higher thermal stability than the polybenzoxazine directly formed by traditional thermal curing.

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