Multifunctional polyester-based materials

Multifunctional Polyester-Based Materials with Controlled Degradability... 

Poly (styrene), saturated polyahcycUc resins and terpene phenol reduce viscosity and impart high flow to the resulting composition. For this reason, the polymers added are sometimes addressed as flow promoters. The materials have some adverse effect as they reduce the heat deflee-tion temperature of the product and increase the flanunability. High flow polyphenylene ether resin compositions have been described." Dendrilie polymers based on polyesters with multifunctional hydroxy compounds offer the advantage to be effective in smaller amounts in comparison to common flow improvers." In addition, heterogeneous blends of PPE with PA have been introduced. 

The most frequently apphed technique for the separation of polymers, namely size-exclusion chromatography (SEC), is based on the well-balanced interactions between the column material, the solvent, and the polymer sample. In order to achieve a complete separation according to size, and also to determine reliable polydispersity values, enthalpic interactions between the sample and column material must be excluded, as only entropic interactions lead to SEC separation. This is not always possible in the case of dendritic polymers which, being multifunctional architectures, have interactions with the column material that are effectively predestined. It has been repeatedly observed that this problem is more severe for higher molar mass products. An example of aromatic hb polyesters with different... 

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