Glass Transition of Disentangled and Entangled Polymer Melts: Single-Chain-Nanoparticles Approach.,Macromolecules

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Glass Transition of Disentangled and Entangled Polymer Melts: Single-Chain-Nanoparticles Approach.
Macromolecules ( IF 5.1 ) Pub Date : 2020-08-20 , DOI: 10.1021/acs.macromol.0c00550
Manjesh K Singh ₁ , Minghan Hu ₁ , Yu Cang ₁ , Hsiao-Ping Hsu ₁ , Heloise Therien-Aubin ₁ , Kaloian Koynov ₁ , George Fytas ₁ , Katharina Landfester ₁ , Kurt Kremer ₁

Affiliation

We study the effect of entanglements on the glass transition of high molecular weight polymers, by the comparison of single-chain nanoparticles (SCNPs) and equilibrated melts of high-molecular weight polystyrene of identical molecular weight. SCNPs were prepared by electrospraying technique and characterized using scanning electron microscopy and atomic force microscopy techniques. Differential scanning calorimetry, Brillouin light spectroscopy, and rheological experiments around the glass transition were compared. In parallel, entangled and disentangled polymer melts were also compared under cooling from molecular dynamics simulations based on a bead-spring polymer model. While experiments suggest a small decrease in the glass transition temperature of films of nanoparticles in comparison to entangled melts, simulations do not observe any significant difference, despite rather different chain conformations.

中文翻译：

解缠结和缠结聚合物熔体的玻璃化转变：单链纳米颗粒方法。

我们通过比较单链纳米粒子（SCNP）和相同分子量的高分子量聚苯乙烯的平衡熔体，研究了缠结对高分子量聚合物玻璃化转变的影响。 SCNP 通过电喷雾技术制备，并使用扫描电子显微镜和原子力显微镜技术进行表征。比较了差示扫描量热法、布里渊光谱法和围绕玻璃化转变的流变实验。同时，还通过基于珠弹簧聚合物模型的分子动力学模拟在冷却下比较了缠结和解缠结的聚合物熔体。虽然实验表明，与缠结熔体相比，纳米粒子薄膜的玻璃化转变温度略有下降，但模拟没有观察到任何显着差异，尽管链构象相当不同。

更新日期：2020-09-09

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