研究目的
The detailed study of the dynamics of polymer particle heating in the process of SSLS comprising aerosol wetting, the determination of the laser-induced temperature gradients on the polymer powder layers, and modeling and analysis of the temperature fields’ distribution in the polymer powder depending on the SSLS parameters used.
研究成果
Effective SSLS of thermolabile polymers can be achieved by melting the surface layers of particles only, without noticeable changes in the chemical and phase compositions of their inner regions, with precise temperature control.
研究不足
The study focuses on a specific type of polymer (PLGA) and a particular laser wavelength (1.96 μm). The applicability of the findings to other materials or laser parameters may require further investigation.
1：Experimental Design and Method Selection:
The study involved both experimental and theoretical approaches to understand the dynamics of polymer particle heating during SSLS. Water aerosol wetting was used to increase the absorbance of laser radiation.
2：Sample Selection and Data Sources:
Fine dispersed polylactic-co-glycolic acid (PLGA) powder was used, with particle sizes between 100 and 50 μm.
3：List of Experimental Equipment and Materials:
A thulium fiber laser at wavelength λ =
4：96 μm, an ultrasonic humidifier, and a thermal imaging camera FLIR (A600 series) were used. Experimental Procedures and Operational Workflow:
A thin layer of polymer powder was formed on a glass substrate, wetted with water aerosol, and sintered by laser radiation at varying speeds.
5：Data Analysis Methods:
The surface temperature was monitored in real time, and the molecular weight distribution of sintered polymers was analyzed by gel permeation chromatography.
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