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10.3390/ma12213519
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Article

Rheological, Thermal, and Degradation Properties of PLA/PPG Blends

by
Dong Xie
1,2,
Yang Zhao
1,2,
Yuan Li
1,2,
Anna Marie LaChance
3,
Jinqing Lai
2,
Luyi Sun
3,* and
Junjia Chen
1,2,*
1
Guangdong Provincial Bioengineering Institute (Guangzhou Sugarcane Industry Research Institute), Guangzhou 510316, China
2
Guangdong Biomaterials Engineering Technology Research Center, Guangzhou 510316, China
3
Polymer Program, Institute of Materials Science and Department of Chemical & Biomolecular Engineering, University of Connecticut, Storrs, CT 06269, USA
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(21), 3519; https://doi.org/10.3390/ma12213519
Submission received: 7 October 2019 / Revised: 24 October 2019 / Accepted: 24 October 2019 / Published: 26 October 2019
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Abstract

The work presented herein focuses on simulating the compounding process via a torque rheometer, as well as the relationship between the melt viscosity and the polymer molecular weight (MW). We aim to predict the plasticization of polylactic acid (PLA) using polypropylene glycol (PPG) with different MWs. The rheological properties of the PLA/PPG composites containing PPG with different MWs were systematically studied by capillary rheometry and torque rheometry. The initial degradation of PLA/PPG composites during melt processing was monitored in real time. The results indicate that PPG can significantly reduce the melt viscosity of PLA/PPG composites, leading to obvious pseudoplastic fluid behavior. The lower the MW of PPG, the lower the viscosity of the PLA/PPG composite. The addition of PPG was favorable for the degradation of PLA during processing, and the degradation degree of the composite materials increased as the MW of PPG was decreased.
Keywords: polylactic acid; polypropylene glycol; rheology; degradation; plasticization polylactic acid; polypropylene glycol; rheology; degradation; plasticization

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MDPI and ACS Style

Xie, D.; Zhao, Y.; Li, Y.; LaChance, A.M.; Lai, J.; Sun, L.; Chen, J. Rheological, Thermal, and Degradation Properties of PLA/PPG Blends. Materials 2019, 12, 3519. https://doi.org/10.3390/ma12213519

AMA Style

Xie D, Zhao Y, Li Y, LaChance AM, Lai J, Sun L, Chen J. Rheological, Thermal, and Degradation Properties of PLA/PPG Blends. Materials. 2019; 12(21):3519. https://doi.org/10.3390/ma12213519

Chicago/Turabian Style

Xie, Dong, Yang Zhao, Yuan Li, Anna Marie LaChance, Jinqing Lai, Luyi Sun, and Junjia Chen. 2019. "Rheological, Thermal, and Degradation Properties of PLA/PPG Blends" Materials 12, no. 21: 3519. https://doi.org/10.3390/ma12213519

APA Style

Xie, D., Zhao, Y., Li, Y., LaChance, A. M., Lai, J., Sun, L., & Chen, J. (2019). Rheological, Thermal, and Degradation Properties of PLA/PPG Blends. Materials, 12(21), 3519. https://doi.org/10.3390/ma12213519

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