Facile and Low Environmental Impact Approach to Prepare Thermally Conductive Nanocomposites Based on Polylactide and Graphite Nanoplatelets

被引:13
作者
Fina, Alberto [1 ]
Colonna, Samuele [1 ]
Maddalena, Lorenza [1 ]
Tortello, Mauro [1 ]
Monticelli, Orietta [2 ]
机构
[1] Politecn Torinosede Alessandria, Dipartimento Sci Applicata & Tecnol, Viale Teresa Michel 5, I-15121 Alessandria, Italy
[2] Univ Genoa, Dipartimento Chim & Chim Ind, Via Dodecaneso 31, I-16146 Genoa, Italy
来源
ACS SUSTAINABLE CHEMISTRY & ENGINEERING | 2018年 / 6卷 / 11期
基金
欧洲研究理事会;
关键词
PLA; Nanocomposites; Reactive extrusion; Graphite nanoplatelets; Thermal conductivity; POLY(LACTIC ACID)/CLAY NANOCOMPOSITES; GRAPHENE-RELATED-MATERIALS; REACTIVE EXTRUSION; CARBON NANOTUBES; COMPOSITES; MORPHOLOGY; PLLA; CRYSTALLIZATION; ACID; PLA;
D O I
10.1021/acssuschemeng.8b03013
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
In this work, the preparation of nanocomposites based on poly(L-lactide) PLLA and graphite nanoplatelets (GNP) was assessed by applying, for the first time, the reactive extrusion (REX) polymerization approach, which is considered a low environmental impact method to prepare polymer systems and which allows an easy scalability. In particular, ad hoc synthesized molecules, constituted by a pyrene end group and a poly(D-lactide) (PDLA) chain (Pyr-D), capable of interacting with the surface of GNP layers as well as forming stereoblocks during the ring-opening polymerization (ROP) of L-lactide, were used. The nanocomposites were synthesized by adding to L-lactide the GNP/initiator system, prepared by dispersing the graphite in the acetone/Pyr-D solution, which was dried after the sonication process. DSC and X-ray diffraction measurements evidenced the stereocomplexation of the systems synthesized by using the pyrene-based initiators, whose extent turned out to depend on the PDLA chain length. All the prepared nanocomposites, including those synthesized starting from a classical initiator, that is, 1-dodecanol, retained similar electrical conductivity, whereas the thermal conductivity was found to increase in the stereocomplexed samples. Preferential localization of stereocomplexed PLA close to the interface with GNP was demonstrated by scanning probe microscopy (SPM) techniques, supporting an important role of local crystallinity in the thermal conductivity of the nanocomposites.
引用
收藏
页码:14340 / 14347
页数:15
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