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首页> 外文期刊>Journal of Applied Polymer Science >Shear and extensional viscosity of thermally aggregated thermoplastic protein
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Shear and extensional viscosity of thermally aggregated thermoplastic protein

机译：剪切和延伸粘度的热聚集热塑性蛋白

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摘要

Novatein is a thermoplastic produced from blood meal and is used in different agricultural applications. Novatein has some unique processing challenges and its rheology was studied using screw-driven capillary rheometry, with a particular focus on sheet extrusion using ethylene glycol, glycerol, propylene glycol (PG), or triethylene glycol (TEG) as plasticizers. The entrance pressure drop contributed up to 44% of the total pressure drop (entrance and capillary pressure drop), but this was significantly reduced by plasticization or increased temperature. Polyol addition led to higher shear viscosities in comparison to no polyol plasticization, most likely due to improved chain mobility resulting in orientation effects. Elongational flow was dominated by primary plasticization of the protein-rich phase and changes in secondary structure, whereas secondary plasticization (phase separation into a polyol-rich phase) played a significant role in the reduction of the shear viscosity. Of the selected plasticizers, PG showed the most efficient plasticization in both shear and elongational flow. When combined with the beneficial secondary structural changes brought about by TEG, the sheet forming ability of Novatein was drastically improved.
机译：Novatein是一种由血粉生产的热塑性塑料，用于不同的农业应用。 Novatein具有一些独特的加工挑战，并且使用螺旋驱动的毛细管流变学研究了其流变学，用乙二醇，甘油，丙二醇（PG）或三甘醇（TEG）作为增塑剂特别聚焦的片材挤出。入射压降占总压降（入口和毛细压降）的44％，但通过塑化或温度升高显着降低。与没有多元醇增塑相比，多元醇加入导致更高的剪切粘度，很可能是由于改善的链迁移率导致取向效应。延长流动是通过富含蛋白质的相的初始塑化和二级结构的变化来支配，而二次塑化（相分离成多元醇富相）在剪切粘度的降低中起显着作用。在选定的增塑剂中，PG在剪切和伸长流动中显示出最有效的塑化。当结合TEG带来的有益二次结构变化时，新生素的片状能力急剧提高。

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