The Preparation And Properties Of PBAT/Organically Modified Montmorillonite Nanocomposites

Poly(butylene adipate-co-terephthalate), as a kind of environment friendly polymer materials, has excellent film forming propertirs, biodegradability and processability, but its expensiveness, poor mechanical properties and the barrier performance limit its application in the field of packaging and promotion. Therefore, the method to modify PBAT is the best way to expand the PBAT’s application.PBAT has been modified and prepared into nanocomposite materials by the layered silicate with organically modified montmorillonite. Meanwhile the performance of the nanocomposite materials and processing technologies were studied. Main contents include: firstly, using the method of melting intercalation, two kinds of organically modified montmorillonite(DK2, DK4) with PBAT preparation have prepared nanocomposites, respectively, and blownd films. The best type and proportion of the composite films have been obtained by exploring intercalated effects, mechanical properties, barrier performance and transparent performance. Secondly, on the base of research that was related to crystallization behavior and kinetics of PBAT/organically modified montmorillonite, the crystallization process of composite films has been analyzed. Finally, the influence on the properties of composite films has been studied in two factors: blow molding technologies and processing temperature, in process of blow molding.The conclusions have been made into four parts. The first one, PBAT molecular chains successfully intercalate organically modified montmorillonite layers, and form of part dissection nanocomposites. The second part, organically modified montmorillonite improved the mechanical properties and moisture permeability of PBAT; PBAT/OMMT-DK4 nanocomposite film’s comprehensive performance is better than PBAT/OMMT-DK2’s; when OMMT-DK4’s content is 1 wt%, the nanocomposite film’s comprehensive performance is the best. The third part, with the increase of cooling rate, peak of crystallization of the nanocomposite films move the lower temperature, and increase crystallinity of the nanocomposite films. If want to achieve the same relative crystallinity, PBAT/OMMT-DK4 and pure PBAT need to under the condition of lower temperature. The last one, blow molding machining’s extrusion rate, traction rate and processing temperature have a greater influence on the mechanical properties and moisture permeability of the nanocomposite films.