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首页> 外文期刊>Journal of Applied Polymer Science >Storage stability and solubility of poly(urea-formaldehyde) microcapsules containing A-olefin drag reducing polymer
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Storage stability and solubility of poly(urea-formaldehyde) microcapsules containing A-olefin drag reducing polymer

机译：含A-烯烃减阻聚合物的聚（脲醛）微胶囊的储存稳定性和溶解性

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摘要

Microcapsules containing α-olefin drag reducing polymer were prepared by in situ and interfacial polymerization with urea, formaldehyde, and styrene as shell materials, respectively. IR spectrums of prepared shells indicated the formations of poly(urea-formaldehyde) and polystyrene in the microencapsulating process. The morphologies of uncoated particles and microcapsules were observed by scanning electron microscopy (SEM) which proved that the α-olefin drag reducing polymer particles were effectively coated. For the purpose of determining the stability of microcapsules in transportation and storage, the static pressure experiment was carried out and lasted for 6 months. In this process, microcapsules with polystyrene as shell material stuck together after 3 months; however, those with poly(urea-formaldehyde) kept the state of particles. The thermal characteristics of uncoated particles (core), poly(urea-formaldehyde) (shell), and microcapsules with that as shell material were characterized by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) which proved that thermal stable temperature of microcapsules containing α-olefin drag reducing polymer with poly(urea-formaldehyde) as shell material was below 225°C, and the mean heat absorbed by microcapsules in the temperature increasing process was 1.5-2.0 W/g higher than that by cores. The evaluation of drag reducing rate of microcapsules showed that the microencapsulating process had no influence on the drag reduction of α-olefin drag reducing polymer.
机译：通过分别以尿素，甲醛和苯乙烯为壳材料的原位和界面聚合制备含α-烯烃减阻聚合物的微胶囊。制备的壳的红外光谱表明在微囊化过程中形成了聚脲-甲醛和聚苯乙烯。通过扫描电子显微镜（SEM）观察了未包被的颗粒和微胶囊的形貌，证明了α-烯烃减阻聚合物颗粒被有效地包被。为了确定微胶囊在运输和储存中的稳定性，进行了静压实验并持续了6个月。在此过程中，以聚苯乙烯为外壳材料的微胶囊在3个月后会粘在一起;然而，那些具有聚（脲甲醛）的物质保持了颗粒状态。通过热重分析（TGA）和差示扫描量热法（DSC）表征了未包衣的颗粒（核），聚（脲醛）（壳）和以其为壳材料的微胶囊的热特性，证明了微胶囊的热稳定温度。含有以聚脲-甲醛为骨架的α-烯烃减阻聚合物的壳层温度低于225°C，且微囊在升温过程中的平均吸收热量比核芯高1.5-2.0 W / g。对微胶囊减阻速率的评价表明，微囊化工艺对α-烯烃减阻聚合物的减阻没有影响。

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