Applications of the Solid Analysis Instrument in the Researches of Thermal Properties and Dynamic Thermomechanical Properties of 3D Printed Polylactic Acid Filaments
With the continuous advancements of additive manufacturing technology,the standardization researches on the thermal properties and dynamic thermomechanical properties of 3D printed raw materials have received much attentions.To quickly evaluate these properties,this study employed a solid-state analyzer to explore a direct method for testing the thermal and dynamic thermomechanical characteristics of 3D printed polylactic acid(PLA)filaments.Compared to the traditional multi-device and multi-measurement approaches,this method minimized systematic errors,ensuring the result consistency and reliability.Through testing the relationships between storage modulus and strain of PLA samples,the results show that the critical strain of PLA samples is less than 0.3%in the testing temperature range,which ensures that the tests could be done in the linear viscoelastic region.By comparing with the data from differential scanning calorimetry,this approach could simultaneously determine the material glass transition temperature,crystallization temperature,and melting temperature.This approach could also offer detailed insights into the temperature dependence of the material viscoelasticity.Further analysis of the effects of different heating rates on the glass transition temperature,crystallization temperature,and melting temperature of materials reveals that,when the heating rate increases from 3℃/min to 10℃/min,the glass transition temperature of PLA decreases by approximately 1.5℃,and the modulus plateau region in the crystallization and melting ranges shortens.The heating rate has a slight effect on the relaxation and stretching of PLA chains,but has a significant impact on the melting crystallization process of PLA.Through the repeated tests of parallel samples,the results show that this method exhibits good precision,and the Grubb's test further validates its stability.The researches could provide references for subsequent studies on the thermal properties and dynamic thermomechanical properties of materials.
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