Xin Shen , Jiping Wang , Xiaodong Wang , Xiaoli Liao , Lu Wan , Zhaolei Li , Chao Yan , Alain Dufresne
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Insight into the acceleration of PLA stereocomplexation within NH2-MIL-88: Influences of free volume
In this study, biodegradable PLA racemic blends (PRB) were infiltrated into an iron-based MOF–NH2–MIL-88 (NM88) unprecedentedly, and their stereocomplexation was explored in detail. Within NM88, PRB demonstrated a reduced crystallization temperature during cooling and a lower melting temperature upon heating. Isothermal crystallization kinetics showed a significant acceleration, particularly at lower temperatures. Additionally, the dielectric characteristic suggested a lower glass transition temperature for PRB within MN88. We suggested that increased free volume fraction may be responsible for the above observations. Through adjusting the free volume fractions, we further preformed a series of molecular simulations, and results agreed with experimental data. This study suggests that chain behavior within confinement is influenced not only by interface and geometrical confinement but also by segment surroundings. It also shed light on hybrid materials composed of Metal-Organic Frameworks (MOFs) and polymer materials.
期刊介绍:
Polymer is an interdisciplinary journal dedicated to publishing innovative and significant advances in Polymer Physics, Chemistry and Technology. We welcome submissions on polymer hybrids, nanocomposites, characterisation and self-assembly. Polymer also publishes work on the technological application of polymers in energy and optoelectronics.
The main scope is covered but not limited to the following core areas:
Polymer Materials
Nanocomposites and hybrid nanomaterials
Polymer blends, films, fibres, networks and porous materials
Physical Characterization
Characterisation, modelling and simulation* of molecular and materials properties in bulk, solution, and thin films
Polymer Engineering
Advanced multiscale processing methods
Polymer Synthesis, Modification and Self-assembly
Including designer polymer architectures, mechanisms and kinetics, and supramolecular polymerization
Technological Applications
Polymers for energy generation and storage
Polymer membranes for separation technology
Polymers for opto- and microelectronics.