Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China; University of Science and Technology of China, Hefei 230026, PR China.
Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China.
J Colloid Interface Sci. 2018 Feb 15;512:600-608. doi: 10.1016/j.jcis.2017.10.100. Epub 2017 Oct 26.
Nonspherical colloidal particles with various geometries and different compositions have attracted tremendous attention and been widely researched. The preparation of polymer colloidal particles with controlled shapes by seeded polymerization is recognized as the most promising technique owing to the precise control of various morphologies and using non-cross-linked seed particles are of particular interest. Seeds particles derived from natural biopolymers are seldom applied. Hence, non-cross-linked starch-based seed could be used to fabricate the anisotropic particles by soap-free seed polymerization. Non-cross-linked starch-based seed particles were prepared by a nanoprecipitation method. Starch/polystyrene composite colloidal particles with shape-tunable were fabricated by soap-free seeded polymerization using starch-based seed. The effect of the polymerization time, monomer feed ratio and seed type were investigated. The seed particles with a single- or multi-hole structure were obtained after swelling with styrene. The resulting particles including golf-like, raspberry-like, octahedron-like and snowman-like structures, was fabricated on the polymerization process. This study firstly reports that the morphology of composite particles from golf-like to snowman-like at high monomer feed ratio using starch-based seed. At low monomer feed ratio, raspberry-like particles were obtained by surface nucleation increasing process. In addition, seed type also effect the morphology of composite particles.
具有各种几何形状和不同组成的非球形胶体颗粒引起了人们的极大关注，并得到了广泛的研究。通过种子聚合制备具有可控形状的聚合物胶体颗粒被认为是最有前途的技术，因为可以精确控制各种形态，并且使用非交联的种子颗粒特别有趣。源于天然生物聚合物的种子颗粒很少被应用。因此，可以使用无皂种子聚合来制备各向异性颗粒的非交联淀粉基种子。通过纳米沉淀法制备了非交联的淀粉基种子颗粒。通过无皂种子聚合，使用淀粉基种子制备了具有可调形状的淀粉/聚苯乙烯复合胶体颗粒。研究了聚合时间、单体进料比和种子类型的影响。用苯乙烯溶胀后，得到具有单孔或多孔结构的种子颗粒。在聚合过程中，得到了高尔夫球状、树莓状、八面体状和雪人状结构的颗粒。本研究首次报道了使用淀粉基种子在高单体进料比下从高尔夫球状到雪人状的复合颗粒的形态。在低单体进料比下，通过表面成核增加过程得到了树莓状颗粒。此外，种子类型也会影响复合颗粒的形态。
