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The properties and morphologies of blends of poly(butylene succinate) (PBS) and glycerol-plasticized thermoplastic starch (TPS) were investigated. Bis-pyrrolidone-type monomers (obtained from itaconic acid) with various sizes of alkylidene spacers were synthesized and polycondensed with various diamines. The resultant polycondensates were used as compatibilizers to improve interfacial adhesion in PBS/starch blends. The presence of long hydrophobic -CH2- sequences in the compatibilizers improved the elongation-at-break during tensile tests. The enhanced compatibilization induced by these copolymers is presumably because of the hydrophobic interaction with PBS and the hydrophilic hydrogen bonding with starch. The uncompatibilized TPS/PBS exhibited a dispersed morphology with blends of low-and high-starch content, whereas the compatibilized blends presented a co-continuous phase

polymer journal

Synthesis of bis(pyrrolidone-4-carboxylic acid)-based polyamides derived from renewable itaconic acid—application as a compatibilizer in biopolymer blends