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Meldrum's acid mediated ketene chemistry (MAMKC) is applied to synthesis of poly(ester amide)s in this work. An MA-functionalized phenolic amide compound (MA_PhOH-Am) is synthesized from the reaction between a MA-functionalized amine and 3,4-dihydrocoumarine (DHC, a biomass-based chemical) through amine-lactone addition reaction. Polymerization of MA_PhOH-Am results in the corresponding poly(ester amide) (P(Es-Am)), through MA thermolysis reaction (generating the corresponding ketene groups) and ketene-phenol addition reaction. Both MA_PhOH-Am and P(Es-Am) have been characterized with spectral methods and thermal analysis. P(Es-Am) has an inherent viscosity of 0.49 dL g-1, a molecular weight of 76,500 Da, a glass transition temperature of 145°C (tand peak in dynamic mechanical analysis), a thermal stability of about 320°C, and a storage modulus at 50°C of 1.0 GPa. In the stress-strain measurement, P(Es-Am) exhibits a Young's modulus, a tensile strength, and an elongation at break of 10.6 ± 0.7 GPa, 165 ± 40 MPa, and 1.83 ± 0.41%, respectively. An effective approach for the synthesis of high-performance poly(ester amide)s has been demonstrated. [ABSTRACT FROM AUTHOR]

A silicon‐containing benzoxazine BATMS‐Bz (1,3‐bis(3‐aminopropyl)tetramethyldisiloxane‐benzoxazine) was used for polybenzoxazine modification by means of formation of benzoxazine copolymers with 3,4‐dihydro‐3‐phenyl‐2H‐1,3‐benzoxazine (Ph‐Bz) and 3‐furfuryl‐3,4‐dihydro‐2H‐1,3‐benzoxazine (F‐Bz), respectively. Ph‐Bz/BATMS‐Bz copolymers showed a positive deviation due the presence of intermolecular hydrogen bonding. However, this effect was not observed with F‐Bz/BATMS‐Bz copolymers. Meanwhile, BATMS‐Bz incorporation exhibited significant effect on toughening polybenzoxazines. It is therefore demonstrated that BATMS‐Bz is a high performance modifier to simultaneously enhance the Tg and toughness of polybenzoxazines. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 1007–1015, 2007 [ABSTRACT FROM AUTHOR]