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首页> 外文期刊>Journal of Applied Polymer Science >Plasticizer migration in bloodmeal-based thermoplastics
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Plasticizer migration in bloodmeal-based thermoplastics

机译：血粉基热塑性塑料中的增塑剂迁移

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摘要

Tri-ethylene glycol (TEG) is an effective plasticizer for many protein-based thermoplastics because of its low volatility, however, partial miscibility with the protein matrix may still lead to some phase separation. Spatial variation of TEG concentration in bloodmeal-based thermoplastics as a result of processing was investigated using synchrotron-based FT-IR micro-spectroscopy. Although TEG forms strong hydrogen bonding with proteins, for the protein to fold into β-sheets bound plasticizer must be released. TEG can then migrate, pooling into localized areas, rich in plasticizer. Further heating causes further migration towards the edge of plasticized bloodmeal particles where the TEG may evaporate. Thermo-gravimetric analysis confirmed that loss of TEG by evaporation may occur at 120°C, given enough time for diffusion. Efficient mixing combined with a short residence time at elevated temperature mean significant plasticizer loss is unlikely during processing. However, it does limit long-term use at elevated temperatures.
机译：三乙二醇（TEG）由于挥发性低，因此对许多基于蛋白质的热塑性塑料都是有效的增​​塑剂，但是，与蛋白质基质的部分混溶性仍可能导致某些相分离。使用基于同步加速器的FT-IR显微光谱研究了加工过程中血粉基热塑性塑料中TEG浓度的空间变化。尽管TEG与蛋白质形成强大的氢键结合，但蛋白质必须折叠成折叠成β-折叠的塑化剂，才能释放出来。然后，TEG可以迁移，集中到富含增塑剂的局部区域。进一步的加热导致进一步迁移到可塑的血粉颗粒的边缘，TEG可能在该边缘蒸发。热重分析证实，如果有足够的扩散时间，在120°C可能会发生蒸发蒸发掉TEG。有效的混合以及在高温下短的停留时间意味着在加工过程中不太可能出现明显的增塑剂损失。但是，它确实限制了在高温下的长期使用。

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