Preparation of oil-containing, polymeric particles having a single depression with various shapes
Preparation of oil-containing, polymeric particles having a single depression with various shapes
复制标题
DOI：
10.1039/c2sm07109f
复制
发表时间：
2012-04
期刊：
影响因子：
3.4
通讯作者：
T. Ohta;D. Nagao;H. Ishii;M. Konno
中科院分区：
文献类型：
--
作者：
T. Ohta;D. Nagao;H. Ishii;M. Konno
通过聚合形成聚合物壳来形成具有单一凹陷的含油颗粒，所述聚合物壳封装通过二甲基二乙氧基硅烷（DMDES）的碱催化水解和缩合制备的聚二甲基硅氧烷（PDMS）的油滴。将3-甲基丙烯酰氧基丙基三甲氧基硅烷（MPTMS）的反应性硅烷试剂加入到PDMS乳液中并用作聚合物壳的来源。水溶性引发剂过硫酸钾用于引发聚合以形成壳层。在低MPTMS浓度下观察到具有褶皱凹陷的聚合物颗粒，而在高MPMTS浓度下获得具有伪半球形凹陷的聚合物颗粒。将另一种壳源苯乙烯（St）添加到聚合体系中以扩展含油颗粒的形态。随着St的加入，聚合反应中MPTMS浓度的增加，凹陷形状从椭圆形半球变为假半球。没有任何抑郁症的球形颗粒也得到了在高的MPTMS浓度的聚合与添加St.的聚合物颗粒中的PDMS油的遏制证实了通过热重分析（TGA）和能量色散X-射线（EDX）测量。计算了MPTMS和St聚合的收缩体积，以研究形成凹陷的主导因素。收缩体积的计算表明，聚合过程中MPTMS的体积收缩是决定含油粒子形态的重要因素。
Oil-containing particles with a single depression were created by polymerization to form polymeric shells encapsulating oil droplets of polydimethylsiloxane (PDMS) that were prepared by the base-catalyzed hydrolysis and condensation of dimethyldiethoxysilane (DMDES). A reactive silane agent of 3-methacryloxypropyltrimethoxysilane (MPTMS) was added to the PDMS emulsion and used as a source of the polymeric shell. The water-soluble initiator potassium persulfate was employed to initiate the polymerization for the shell formation. Polymeric particles with a wrinkled depression were observed at low MPTMS concentrations, whereas those with a pseudo-hemispherical depression were obtained at high MPMTS concentrations. Another shell source, styrene (St), was added to the polymerization system for extending morphologies of the oil-containing particles. An increase in MPTMS concentration in the polymerization with the addition of St varied the depression shape from an ellipsoidal hemisphere to a pseudo-hemisphere. Spherical particles without any depression were also obtained at a high MPTMS concentration in the polymerization with the addition of St. The containment of PDMS oil in the polymeric particles was confirmed by thermal gravimetric analysis (TGA) and energy dispersive X-ray (EDX) measurement. Shrinkage volumes by the polymerization of MPTMS and St were calculated to examine the dominant factor for formation of the depression. The calculation of shrinkage volumes indicated that the volume shrinkage of MPTMS in the polymerization was an important factor to determine the morphology of oil-containing particles.