Preparation of Polystyrene with Higher Tg Based on Triple Hydrogen Bond Interactions

Chapter 4 Conclusion

Tg of polystyrene, a common polymer, is dramatically elevated based on crosslinkage between introduced imide units and melamine. Polystyrene with imide molar concentration of 5.05% has Tg of 122^oC in the presence of melamine, 22 ^oC higher than polystyrene, which will extend application of polystyrene. At high ratio of melamine to imide, two Tgs are observed, one is higher than 122^oC but another much lower. The existence of two Tg is due to the fact that free melamine is acting as plasticizer.

Diaminopyridine also increase Tg of polystyrene. In this case, the blend looks like a copolymer of styrene with a big monomer, complex of maleimide and Diaminopyridine. but increment is less than melamine owing to lack of crosslinking between them.

The secondary interactions between melamine or Diaminopyridine with polystyrene containing imide is confirmed by their blends readily soluble in DMSO and in CH₂Cl₂.

References Notes

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