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Published on: June 17, 2014
Surface grafting of cellulose nanocrystals with poly(3-hydroxybutyrate-co-3-hydroxyvalerate)
1The Key Laboratory of Advanced Textile Materials and Manufacturing Technology of Ministry of Education, College of Materials and Textile, Zhejiang Sci-Tech University, Hangzhou 310018, China; State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China; National Engineering Lab of Textile Fiber Materials & Processing Technology, Zhejiang Sci-Tech University.
Abstract:
Chemically modified cellulose nanocrystals (CNCs) were synthesized by grafting poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) onto CNCs via homogeneous acylation reaction between N,N-dimethyl formamide (DMF) by using toluene diisocyanate (TDI) as coupling agent and dibutyltin dilaurate as catalyst. The resulting copolymers were studied by using (1)HNMR, FT-IR, WAXD, DSC, TGA and contact angle measurements. Results showed that the copolymers kept their initial morphological integrity. Moreover, it is found that with the increase of the TDI/PHBV fractions, two transition exhibitions occurred in their thermal and hydrophobic properties, which could be modulated through controlling the lengths and grafting densities of PHBV side chains. Compared with those of neat PHBV, the crystallization of PHCN7 became easy while the crystallinity slightly decreased to 55.5%, the maximum decomposition temperature increased by 48.5°C, meanwhile the contact angle increased to 58° as compared to neat CNCs (30°).
