Study of Effects of Processing Aids on Properties of Poly(lactic acid)/Soy Protein Blends |
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Authors: | Bo Liu Long Jiang and Jinwen Zhang |
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Institution: | (1) Materials Science Program & Composite Materials and Engineering Center, Washington State University, Pullman, WA 99164, USA; |
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Abstract: | In this work, two processing aids, acetyl tri-n-butyl citrate and an alkene bis fatty amide (wax), were investigated for their
effects on rheological properties, morphology, thermal transition temperatures, and mechanical properties of the poly(lactic
acid) (PLA)/soy protein concentrate blends. Acetyl tri-n-butyl citrate and alkene bis fatty amide played different roles in
improving the processability of the blends, with the former functioning as a plasticizer for PLA and the latter as an internal/external
lubricant. The amide wax was more effective in reducing blend melt viscosity through its dual functions of internal and external
lubrication. Acetyl tri-n-butyl citrate displayed a stronger effect in facilitating PLA nucleation than the amide wax. Both
processing aids decreased tensile strength and modulus of the blends and increased break strain and impact strength. |
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Keywords: | |
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