Multiphase materials with lignin. 11. Starlike copolymers with caprolactone

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Multiphase starlike copolymers have been prepared using polycaprolactone as hard, arm segments and hydroxypropyl lignin as the core of the star. Copolymer architecture differed in terms of the average number of arms per core, which ranged between 2 and 7, and in terms of hydroxypropyl lignin molecular size and T g , which ranged between 2100 and 6400 D and -7 and +85°C, respectively. The copolymers, which had nearly uniform but broad molecular weight distributions, were analyzed with regard to solution properties, thermal characteristics, and crystallinity