首页> 外文期刊>Journal of Applied Polymer Science >The role of plasticizers during protein thermoplastic foaming
【24h】

The role of plasticizers during protein thermoplastic foaming

机译:增塑剂在蛋白质热塑性发泡过程中的作用

获取原文
获取原文并翻译 | 示例
           

摘要

Protein thermoplastics, like Novatein, typically comprise a polymer, additives, and plasticizers. During foaming, the plasticizers performed different functions; triethylene glycol (TEG) affected the T-g of the polymer, while water altered the shear viscosity and urea the extensional viscosity. Water and urea also functioned as blowing agents; increasing urea increased the expansion ratio, while an increase in TEG and water decreased it. It was concluded that at this level of plasticization, phase separation occurred and that the plasticizers are most influential during late bubble growth and stabilization. Contrary to previous thought, increasing water had no effect on the T-g, but did lower the shear viscosity, while increasing TEG had the opposite effect. This enables the properties of protein thermoplastics to be tailored during development. During foaming, lower viscosity allows more time for gases to diffuse before the viscosity in the surrounding polymer increases, restricting bubble growth. At higher TEG content, the material is processed further above its T-g, slowing down stabilization and decreasing expansion. This study clarified the role of plasticizers during foaming and showed a decrease in random coils and beta-turns (measured by FT-IR) with increasing expansion ratio. Knowledge of these mechanisms enables tailoring properties of protein thermoplastics foams during development. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47781.
机译:蛋白质热塑性塑料,如新蛋白,通常包含聚合物,添加剂和增塑剂。在发泡过程中,增塑剂进行了不同的功能;三甘醇(TEG)影响聚合物的T-G,而水改变了剪切粘度和尿素的延伸粘度。水和尿素也运作为吹风剂;增加尿素增加了膨胀率,而TEG和水的增加会降低。结论是,在这种塑化水平,发生相分离,增塑剂在晚期泡沫生长和稳定期间最有影响力。与先前的思想相反,增加水对T-g没有影响,但确实降低了剪切粘度,同时增加TEG具有相反的效果。这使得能够在开发期间定制蛋白质热塑性塑料的性质。在发泡过程中,降低粘度允许在周围聚合物中粘度增加的粘度之前弥漫在弥漫的粘度,限制气泡生长。在较高的TEG含量下,该材料进一步优于其T-g,减缓稳定性并降低膨胀。这项研究阐明了增塑剂在发泡过程中的作用,并且随着膨胀率的增加,随机线圈和β转(通过FT-IR测量)的减少。了解这些机制,使得能够在发育过程中定制蛋白质热塑性塑料泡沫的性质。 (c)2019 Wiley期刊,Inc.J.Phill。聚合物。 SCI。 2019,136,47781。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号