Performance, crystallization and rheological behavior of poly(lactic acid)/N-(2-hydroxyl) propyl-3-trimethyl ammonium chitosan chloride intercalated vermiculite grafted poly(acrylamide) nanocomposites

摘要

N-(2-hydroxyl) propyl-3-trimethyl ammonium chitosan chloride (HTCC) was synthesized with chitosan and 2,3epoxypropyl trimethyl ammonium chloride. Moreover, the grafted acrylamide copolymer (HTCC-VMT-PAM) was synthesized with HTCC, vermiculite (VMT) and acrylamide (AM). The antibacterial test results demonstrated that HTCC-VMT-PAM had significant biological antibacterial activity, and the inhibition area against Aspergillus, Penicillium, Alternaria alternate, Staphylococcus aureus and Escherichia coli were 1.90 +/- 0.14, 2.20 +/- 0.15, 5.20 +/- 1.07, 27.97 +/- 1.42 and 37.69 +/- 1.09 cm(2), respectively. Moreover, poly(lactic acid) (PLA)/HTCC-VMT-PAM nanocomposites were prepared using PLA and various contents of HTCC-VMT-PAM as fillers. The mechanical testing results showed that the tensile strength, elongation at break and impact strength of PLA/HTCC-VMT-PAM nanocomposites were increased by 11.48%, 10.48% and 33.98%, respectively, higher than that of pure PLA when the addition amount of HTCC-VMT-PAM was 0.7 wt%. Owing to the strong heterogeneous nucleation of HTCC-VMT-PAM, it induced rapid crystallization of PLA and improved the crystallinity of PLA to 41.97%. Rheological behavior showed that HTCC-VMT-PAM and PLA matrix had strong compatibility. Enzymatic degradation behavior showed that the addition of HTCC-VMT-PAM had some inhibition effect on the biodegradability of PLA.