Effect of Silver Nanoparticles on the Melting Behavior, Isothermal Crystallization Kinetics and Morphology of Polyoxymethylene
文献类型： 外文期刊
作者： Zeng, Yicheng 1 ; Liu, Yang 1 ; Zhang, Xun 1 ; Wang, Lumin 1 ; Huang, Hongliang 1 ; Liu, Yongli 1 ; Qi, Guangrui 1 ; Min, 1 ;
作者机构： 1.Chinese Acad Fishery Sci, East China Sea Fisheries Res Inst, Key Lab Ocean & Polar Fisheries, Minist Agr & Rural Affairs, Shanghai 200090, Peoples R China
2.Pilot Natl Lab Marine Sci & Technol Qingdao, Qingdao 266237, Peoples R China
3.Hunan Engn Res Ctr Rope & Net, Yueyang 413100, Peoples R China
4.Univ Shanghai Sci & Technol, Coll Mat Sci & Engn, Shanghai 200093, Peoples R China
关键词： POM; Ag nanoparticles; POM; Ag nanocomposites; isothermal crystallization kinetics; heterogeneous nucleation; nucleation sites
期刊名称：CRYSTALS （ 影响因子：2.589； 五年影响因子：2.615 ）
ISSN： 2073-4352
年卷期： 2020 年 10 卷 7 期
页码：
收录情况： SCI
摘要： In this work, the effects of silver (Ag) nanoparticles on the melting behavior, isothermal crystallization kinetics, and morphology of polyoxymethylene (POM) were studied. It was found that the melting peak temperature (T-m) and the crystallization temperature (T-C) of POM/Ag nanocomposites shifted to higher temperature with the content of Ag nanoparticles increased. In addition, the isothermal crystallization kinetics of POM/Ag nanocomposites were determined by Avrami and Lauritzen-Hoffman models. The results of crystallization half-time (t(0.5)), reciprocal of crystallization half-time (tau(0.5)), Avrami exponent (n), and Avrami rate constant (k) showed that low loading of Ag nanoparticles (<= 1 wt%) accelerated the crystallization rate of POM. However, when the content of Ag nanoparticles reached 2 wt%, they aggregated together and restrained crystallization of POM. Meanwhile, the results of nucleation parameter (K-g) and surface free energy of folding (delta(e)) revealed that Ag nanoparticles reduced the energy need to create a new crystal surface, leading to faster crystallization. Moreover, the crystallization activation energies ( increment E) were determined using the Arrhenius model, which suggested that Ag nanoparticles induced the heterogeneous nucleation by lowing the increment E. Furthermore, polarized light microscopy results indicated Ag nanoparticles generated a great amount of nucleation sites and led to the formation of smaller spherulites.
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