Preparation and Properties of Spherical Natural Rubber/Silica Composite Powders via Spray Drying

IF 2.6 4区 材料科学 Q3 ENGINEERING, CHEMICAL KONA Powder and Particle Journal Pub Date : 2020-01-10 DOI:10.14356/kona.2020009
S. Tang, Prachaya Sopanon, W. Tanthapanichakoon, A. Soottitantawat
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引用次数: 3

Abstract

In this work, composite powders of natural rubber/silica (NR-SiO 2 ) were prepared via sol-gel and spray drying method. The morphology and physical properties of resultant rubber composite powders were characterized by scanning electron microscopy with energy dispersive X-ray spectrometry, laser light scattering particle sizer and thermogravimetric analyzer. The results showed that spray-dried NR-SiO 2 particles were spherical in shape with diameter of less than 10 μm, with silica on the outer layer. The particle size was found to increase gradually with the increase in NR/Si mass ratio. Marginal growth in particle size was observed with increasing feed flow rate. Increasing inlet air temperature improved the latex particle encapsulation by silica layer while maintaining the final particle size. The mechanical properties of NR-SiO 2 powders-filled polylactic acid (PLA) composite increase gradually with the addition of dried particles of higher rubber content. However, the composite exhibited relatively lower or reduced tensile strength and elongation at break compared to the host PLA polymer. This could be attributed to poor filler dispersion associated with weak filler/matrix interaction effect occurring during melt-compounding process.
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喷雾干燥法制备球形天然橡胶/二氧化硅复合粉体及其性能
本文采用溶胶-凝胶法和喷雾干燥法制备了天然橡胶/二氧化硅(nr - sio2)复合粉体。采用扫描电子显微镜、x射线能谱仪、激光光散射粒度仪和热重分析仪对合成的橡胶复合粉末的形貌和物理性能进行了表征。结果表明:喷雾干燥后的nr - sio2颗粒呈球形,粒径小于10 μm,外层为二氧化硅;随着NR/Si质量比的增加,颗粒尺寸逐渐增大。随着进料流量的增加,颗粒尺寸略有增大。提高进风温度,在保持最终粒径不变的情况下,提高了乳胶颗粒被二氧化硅层包裹的程度。随着橡胶含量较高的干燥颗粒的加入,nr - sio2粉体填充聚乳酸(PLA)复合材料的力学性能逐渐提高。然而,与宿主PLA聚合物相比,复合材料的抗拉强度和断裂伸长率相对较低或降低。这可能是由于熔体复合过程中填料分散性差,填料/基体相互作用弱造成的。
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来源期刊
KONA Powder and Particle Journal
KONA Powder and Particle Journal 工程技术-材料科学:综合
CiteScore
8.40
自引率
4.90%
发文量
35
审稿时长
>12 weeks
期刊介绍: KONA publishes papers in the broad field of powder science and technology, ranging from fundamental principles to practical applications. Papers describing technological experience and critical reviews of existing knowledge in special areas are also welcome.
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