title: The physical properties of poly(l-lactide) and functionalized eggshell powder composites.
abstract: Aiming at improved crystallization performance and simultaneously enhanced solid-state properties of poly(l-lactide) such as mechanical properties and enzymatic hydrolysis. A novel functionalized eggshell powder decorated with calcium phenylphosphonic acid (NES) was synthesized via the chemical reaction between phenylphosphonic acid and calcium ion on the surface of eggshell powder to form effective nucleating surface for poly(l-lactide). The resultant NES was incorporated into PLLA matrix to form fully biodegradable composites by melt blending, which exhibited superior crystallization, mechanical properties, and enzymatic hydrolysis. Upon the addition of 20 wt% NES, the crystallization half-time of a PLLA/NES composite decreased from 27.09 to 0.69 min at 130°C, compared to that of neat PLLA. The storage and tensile moduli of the composites increased with increasing NES loadings. Even with 20 wt% NES, the composite still exhibited good mechanical properties with tensile strength of 53.4 MPa, tensile modulus of 2460MPa and elongation at break of 2.5%, respectively. Moreover, it was interesting to find that the enzymatic hydrolytic degradation rates had been enhanced pronouncedly in the PLLA/NES composites than in neat PLLA. Such high performance biocomposites have great potential in expanding the utilization of eggshell powder from sustainable resources and practical application as PLLA-based bioplastic.
authors.affiliation: College of Material Science and Engineering, Jilin Jianzhu University, Changchun 130118, China; Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Li
authors.affiliation: Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China.
authors.forename: Shuangyang
authors.initials: S
authors.lastname: Xin
authors.affiliation: Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China.
authors.forename: Yijie
authors.initials: Y
authors.lastname: Bian
authors.affiliation: Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China.
authors.forename: Kun
authors.initials: K
authors.lastname: Xu
authors.affiliation: Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China. Electronic address: cyhan@ciac.ac.cn.
authors.forename: Changyu
authors.initials: C
authors.lastname: Han
authors.affiliation: Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China.
authors.forename: Lisong
authors.initials: L
authors.lastname: Dong
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry*; D002152:Calorimetry, Differential Scanning; D006868:Hydrolysis; D008422:Materials Testing; D055595:Mechanical Phenomena; D011091:Polyesters / Q000737:chemistry*; D011208:Powders; D017550:Spectroscopy, Fourier Transform Infrared; D013329:Structure-Activity Relationship; D013816:Thermodynamics
chemical_list: D001672:Biocompatible Materials; D011091:Polyesters; D011208:Powders; C033616:poly(lactide)
keywords: Composite; Eggshell powder; Poly(l-lactide)