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首页> 外文期刊>Journal of Microencapsulation: Microcapsules Liposomes Nanoparticles Microcells Microspheres >Polyurethane-based microparticles:Formulation and influence of processes variables on its characteristics
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Polyurethane-based microparticles:Formulation and influence of processes variables on its characteristics

机译：聚氨酯基微粒：工艺变量的形成及其特性的影响

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摘要

This study reports the development of polyurethane-based microparticles and the influence of some processes variables on its characteristics.These microparticles were prepared by emulsion polymerization,using poly(caprolactone) diol (PCL) and poly(propylene glycol),tolylene 2,4-diisocyanate terminated (TDI) or poly(propylene oxide)-based tri-isocyanated pre-polymer (TI).The reaction of polymerization was confirmed by attenuated total internal reflection Fourier transformed infrared spectroscopy (ATR-FTIR).Their thermal characteristics were investigated by dynamical mechanical thermal analysis (DMTA) and thermogravimetric analysis (TGA).For good microparticles formation,formulation 80/20 (mass ratio isocyanate/PCL) was the most indicated.Their spherical shape and smooth surface were observed by optical and scanning electron microscopy (SEM).Zeta potential measurements suggest that ionized carbonyl groups existent at the surface can be responsible for the negative potentials obtained.Respecting size and size distribution of the particles,measured by laser diffraction spectroscopy (LDS),the stirring speed and type were the process variables that most influenced it.
机译：这项研究报告了聚氨酯基微粒的发展以及一些工艺变量对其特性的影响。这些微粒是通过乳液聚合反应，使用聚己内酯二醇（PCL）和聚丙二醇，甲苯2,4-二异氰酸酯封端的（TDI）或聚环氧丙烷基的三异氰酸酯预聚物（TI）。通过衰减的全内反射傅里叶变换红外光谱（ATR-FTIR）确认聚合反应，并通过动态机械热分析（DMTA）和热重分析（TGA）。为了形成良好的微粒，最适合的配方为80/20（异氰酸酯/ PCL的质量比）。通过光学和扫描电子显微镜观察其球形和光滑表面（ SEM电位测量表明，表面存在的离子化羰基可能是所获得的负电位的原因。考虑到颗粒的尺寸和大小分布，通过激光衍射光谱（LDS）测量，搅拌速度和类型是影响颗粒最大的工艺变量。

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