Cellulose Acetate Thermoplastics with High Modulus, Dimensional Stability and Anti-migration Properties by Using CA- g -
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ARTICLE
POLYMER SCIENCE
https://doi.org/10.1007/s10118-020-2470-2 Chinese J. Polym. Sci.
Cellulose Acetate Thermoplastics with High Modulus, Dimensional Stability and Anti-migration Properties by Using CA-g-PLA as Macromolecular Plasticizer Ru-Meng Xua,b†, Tian-Tian Yanga,b†, Elvira Vidovićc*, Ruo-Nan Jiaa, Jin-Ming Zhanga*, Qin-Yong Mia, and Jun Zhanga,b* a CAS
Key Laboratory of Engineering Plastics, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing 100190, China b University of Chinese Academy of Sciences, Beijing 100049, China c Faculty of Chemical Engineering and Technology, University of Zagreb, Zagreb 10000, Croatia
Electronic Supplementary Information Abstract Cellulose diacetate (CDA) can be melt-processed to produce numerous and widely-used plastic products. However, due to the high glass transition temperature (Tg) of CDA, the addition of up to 30 wt% of micromolecular plasticizers is indispensable, which significantly reduces the dimensional stability and raises safety concerns from the migration of plasticizers. In this work, a series of CDA-graft-poly(lactic acid) (CDA-gPLA) copolymers were synthesized by ring-opening polymerization of lactide onto the hydroxyl groups of CDA. The resultant CDA-g-PLA copolymers possess adjustable degrees of substitution (DSPLA) and side chain length (DPPLA) by controlling the reaction time and feed ratio. The Tgs and thermal flow temperatures (Tfs) of CDA-g-PLA strongly depend on DPPLA, such as the Tgs decrease linearly with the increase of DPPLA. The CDA-g-PLA copolymers with the DPPLA of 3−9 can be directly processed to transparent plastics by melt processing without any external plasticizers, because of their low Tfs of 170−215 °C. More impressively, the CDA-g-PLA can act as the macromolecular plasticizer. The obtained CDA/CDA-g-PLA has higher storage modulus, flexural modulus and Young's modulus than the commercial CDA plasticized with triethyl citrate. In addition, the CDA/CDA-g-PLA exhibits high dimensional stability and anti-migration property. During a long-term treatment at 80 °C and 60% humidity, the CDA/CDA-g-PLA can retain the initial shape. Therefore, this work not only proposes a facile method for achieving a direct thermoplastic processing of CDA, but also provides a macromolecular plasticizer for CDA to make lightweight, stable and safer biobased thermoplastics. Keywords Cellulose diacetate; Thermoplastic processing; Macromolecular plasticizer; Poly(lactic acid) Citation: Xu, R. M.; Yang, T. T.; Vidović, E.; Jia, R. N.; Zhang, J. M.; Mi, Q. Y.; Zhang, J. Cellulose acetate thermoplastics with high modulus, dimensional stability and anti-migration properties by using CA-g-PLA as macromolecular plasticizer. Chinese J. Polym. Sci. https://doi.org/10.1007/s10118-020-2470-2
INTRODUCTION Eco-friendly, renewable, and recyclable materials have received an increasing attention, due to the escalating environmental pollution.[1−6] Cellulose diacetate (CDA) obtaine
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