Preparation And Rheological Property Of PBCA Nanocapsules Loading With Linalool

Research on microcapsules is a highly interdisciplinary field that benefits from contributions from various branches of natural sciences and engineering, and progress in material sciences allowed production of microcapsules whose structure and composition are controlled on the nanoscale. In general, encapsulation can improve the solubility, stability and bio availability of encapsulated species, increase their protection, reduce evaporation, promote easier handling and control the release during prolonged storage and applications. It is already today an important processing method in industry. BCA referenced from medical field and used as encapsulating agent in this paper, is much attractive owing to its biodegradability, biocompatibility, availability and low toxicity.The paper were studied the production of linalool nanocapsules, and choosed emulsion polymerization selecting n-butylcyanoacrylate (BCA) as encapsulant, and discussed the influence of different single factor on the z-average and the PDI of nanocapsules to obtain optimum preparation conditions. Structure, thermal stability, core material encapsulation effect and storage stability of nanocapsule emulsions prepared under the optimal preparation conditions were characterized. The FTIR spectra demonstrates that linalool had been encapsuted into PBCA. TGA demonstrated that the thermostability of linalool encapsulated in PBCA nanocapsules had been enhanced. Storage stability analysis indicated that the stability of the system can be predicted by average diameter and polydispersity.Also the paper discusses rheological behaviors of linalool nanocapsule emulsions contenting different concentration of linalool. Shear-thinning behavior was observed in linalool nanocapsule emulsions in steady state rheology analysis. The frequency sweep measurements indicated nanocapsule emulsions of higher or tower linalool content basically showed viscosity under tow frequency, while exhibited elasticity when linalool concentration was 0.8%. Besides, the steady rheological behaviors of linalool nanocapsule emulsions could be fitted with Carreau model with 4 parameters well.It can be seen that the result from storage stability analysis was in accordance with that from rheological tests, which illustrated that the rheological features reflected the stability of the system to some extent, so it could be predicted by rheological experiment.