Fully Bio-Based Composites of Poly(Lactic Acid)Reinforced with Cellulose-Graft-Poly-(ε-Caprolactone)Copolymers  

作　　者：Chengtao Gao Yang Wu Haibo Xie 

机构地区：[1]College of Materials and Metallurgy,Guizhou University,Guiyang,China [2]National Engineering Research Center for Compounding and Modification of Polymer Materials(Guizhou Material Industrial Technology Institute),Guiyang,China [3]College of Materials Science&Engineering,University of Nanchang,Nanchang,China

出　　处：《Journal of Renewable Materials》2023年第3期1137-1152,共16页可再生材料杂志（英文）

基　　金：supported by the National Natural Science Foundation of China(21574030,52063007,51863004);Guizhou Province High-Level Innovative Talents Fund([2020]6024);Guizhou Provincial Science and Technology Projects(Grant No.[2022]024)and the Science and Technology Project of Baiyun District,Guiyang City(Grant No.[2020]26);the authors gratefully acknowledge the financial support from the National Engineering Research Center for Compounding and Modification of Polymeric Materials(Guizhou Material Industrial Technology Institute).

摘　　要：Due to the increasing demand for modified polylactide(PLA)meeting“double green”criteria,the research on sustainable plasticizers for PLA has attracted broad attentions.This study reported an open-ring polymerization method to fabricate cellulose(MCC)-g-PCL(poly(ε-caprolactone))copolymers with a fully sustainable and biodegradable component.MCC-g-PCL copolymers were synthesized,characterized,and used as green plasticizers for the PLA toughening.The results indicated that the MCC-g-PCL derivatives play an important role in the compatibility,crystallization,and toughening of the PLA/MCC-g-PCL composites.The mechanical properties of the fully bio-based PLA/MCC-g-PCL composites were optimized by adding 15 wt%MCC-g-PCL,that is,the elongation at break was 22.6%(~376%higher than that of neat PLA),the tensile strength was 47.3 MPa(comparable to that of neat PLA),and the impact strength was 26 J/m(~130%higher than that of neat PLA).DSC results indicated that MCC-g-PCL reduced the Tg of the PLA blend.When the addition amount was 15 wt%,the Tg of the blend was 58.4°C.Compared with MCC,MCC-g-PCL polyester plasticizer has better thermal stability,T5%(°C)can still be maintained above 300°C.The rheological results showed that MCC-g-PCL acted as a plasticizer,the introduction of PCL flexible chain increased the mobility of PLA molecular chain,and decreased the complex viscosity,storage modulus and loss modulus of PLA blends.The MCC-g-PCL derivatives,as a new green plastic additive,have shown an interesting prospect to prepare fully bio-based composites.

关 键 词：Green plasticizers PLA cellulose(MCC)-g-PCL fully bio-based composites 

分 类 号：TB332[一般工业技术—材料科学与工程]