Dr. Cattaleeya Pattamaprom is currently the head of polymer and rubber technology center and an associate professor at the department of chemical engineering, Thammasat University, Thailand. She obtained her doctoral degree specialized on theoretical modeling of polymer rheology from the department of chemical engineering, University of Michigan, USA. Her research areas include rheology and theoretical modelling of polymer and rubber, polymer and rubber modification, polymer/rubber processing, composites and blends. Most recently, her research focuses on value adding and sustainable use and development of biopolymer and natural rubber products. With her background as a chemical engineer, another area of her expertise is on heat transfer, heat exchanger design and biodiesel


Polylactic acid (PLA) is currently known to be the cheapest and the most prevalent commercial bioplastic. However, its poor toughness and processability limited its applications in film blowing products. In this study, improvement in the toughness of PLA was investigated by blending with natural rubber (NR) with the aid of a plasticizer. The improvement in the bubble stability during film blowing process was investigated by using a peroxide branching agent (BA). The compound of PLA, NR and a branching agent (PLA/NR/BA) was prepared by reactive melt blending method.  The parameters investigated are the PLA to NR ratio and the content of branching agent on the mechanical properties, processability, and morphology of the blend. The results indicated that NR could increase the tensile toughness and elongation at break of  PLA blown films and the use of higher amount of branching agent could allow stable processing of PLA/NR blends at  higher NR content. The reactions of branching agent with PLA and NR were verified by Fourier-transform infrared spectroscopy.