A tale of two polyamides: Comparing the crystallization kinetics of a hot-melt adhesive and a PA 6/66 copolymer
A tale of two polyamides: Comparing the crystallization kinetics of a hot-melt adhesive and a PA 6/66 copolymer
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DOI：
10.1016/j.tca.2022.179176
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发表时间：
2022-02-19
影响因子：
3.5
通讯作者：
Peterson, Amy M.
中科院分区：
文献类型：
--
作者：
Pourali, Masoumeh;Peterson, Amy M.
本文采用快速扫描量热法（FSC）和差示扫描量热法（DSC）研究了两种聚酰胺的等温和非等温结晶动力学，一种是聚酰胺基热熔胶（商品名为Technomelt PA 6910），另一种是PA 6和PA 66的共聚物。虽然这两种材料作为材料挤出增材制造的原料表现出良好的性能，但它们的结晶行为和动力学差异很大。Technomelt PA 6910的结晶速度比PA 6/66慢得多，这是因为Technomelt PA 6910结构中的氢键密度较低。低玻璃化转变温度促进Technomelt PA 6910的室温结晶。PA 6/66是一种无规共聚物，其更快的结晶归因于高密度的氢键，伴随着熔体内氢键的片状结构，这有利于高温结晶。这项研究的动力学结果使这些材料的结晶动力学与包括材料挤出增材制造在内的加工技术的热模型相结合。
In this work, the isothermal and non-isothermal crystallization kinetics of two polyamides, a polyamide-based hot melt adhesive with the trade name of Technomelt PA 6910 and a copolymer of PA 6 and PA 66, are studied using Fast Scanning Calorimetry (FSC) and Differential Scanning Calorimetry (DSC). While both of these materials exhibit good performance as feedstocks for material extrusion additive manufacturing, their crystallization behavior and kinetics differ substantially. Technomelt PA 6910 crystallizes much slower than the PA 6/66 due to the lower density of hydrogen bonding within Technomelt PA 6910's structure. The low glass transition temperature encourages room temperature crystallization of Technomelt PA 6910. PA 6/66 is a random copolymer whose faster crystallization is attributed to a high density of hydrogen bonding accompanied by a sheet-like structure of the hydrogen bonding within the melt, which favors high-temperature crystallization. The kinetic results from this study enable coupling the crystallization kinetics of these materials with thermal models for processing techniques including material extrusion additive manufacturing.