Networks with Stiff Main-Chain Mesogens, Flexible spacers and Rigid Branchpoints

2 Networks with StifF Main-Chain Mesogens, Flexible Spacers and Rigid Branchpoints 

We are aware of only two LCP networks falling in this category. In one case, melamine serves as the rigid branchpoint in a network containing main-chain stiff mesogens and a variety of flexible spacers [114,115]. Typically, hydroxy- 

The branchpoint substitution level on the HMMM nucleus depends on the cure conditions [116,117]. The presence of unreacted hydroxy groups in the crosslinked networks [114] indicates, however, that not all the functionalities were reacted. Network segments left dangling loose on one end, and segments twice as long as the precursor oligomers and containing a melamine residue in their center, are both present as defects in these LCP networks. 

The degree of crosslinking can be altered by changes in the aldehyde to diamine ratio. The network in this case shows both thermotropic and lyotropic behavior over certain temperature intervals. 

3 Networks with Stiff Pendant Mesogens, Flexible Main-Chains and Flexible Junctions 

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