The Effect of Peroxide on the Film Blowing Stability and Rheological Properties of Polylactic acid Blown Films

Peerapong Chanthot, Noppadon Kerddonfag, Cattaleeya Pattamaprom


This study is the first study correlating the effect of the peroxide branching agent with the film blowing stability of polylactic acid (PLA). The peroxide content was varied between 0-0.5 wt%, and the changes in molecular structures, rheological properties, film bubble stability, and mechanical properties were investigated. Our research goal is to improve the processability of PLA blown film and identify key parameters for the good processability of PLA. It was found that the addition of a sufficiently high peroxide content-led not only to higher storage modulus (G') but also to higher melt strength and significant improvement in the film blowing processability, where the blow-up ratio (BUR) increased with increasing peroxide content. However, the peroxide content higher than 0.3 wt% tended to cause stiffer film and a higher amount of gels. Another interesting finding is that the terminal region's G value was strongly correlated with melt strength and film blowing processability.


Keywords: polylactic acid, film blowing, peroxide, processability, rheological properties.


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