Ma Huijun, Hua Yuai, Hou Zhaosheng, Gao Feng, Zhang Xiao, Shao Mingxia, Ma Tiange, Liu Mingxia, Li Tianduo, Xu Jing
Shandong Provincial Key Laboratory of Molecular Engineering, School of Mathematics and Statistics, Qilu University of Technology Library, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, P. R. China.
College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250100, P. R. China.
ACS Omega. 2021 May 20;6(21):13915-13925. doi: 10.1021/acsomega.1c01789. eCollection 2021 Jun 1.
In this work, the effects of droplet size and reaction time on the adsorption-reaction processes between gelatin and α-[3-(2,3-epoxypropoxy) propyl]-ω-butyl-polydimethylsiloxane (PDMS-E) emulsion droplets were studied. Gelatin molecules were only physically adsorbed on the surface of the PDMS-E droplet in the 0-75 min range, which was unrelated to the droplet size (100-1000 nm). For the small-size droplets (<410 nm), the physical adsorption proceeded over 75 min followed by agglomeration. For middle-size droplets (410-680 nm), the physical adsorption finished at 125 min; subsequently, the nucleophilic reaction between the primary amino group and the epoxy group began to happen, and globular-like or core-shell colloidal particles were formed. For large-size droplets (>680 nm), the nucleophilic reaction occurred at 75 min and produced core-shell or multi-layered colloidal particles. In a word, the physical absorption or nucleophilic reaction between gelatin and PDMS-E emulsion droplets could be controlled by controlling the droplet size and reaction time. Furthermore, the soft tissue paper coated with large-size droplets exhibited excellent resistance to water permeability and flame-resistant performance, which were carried out by water resistance and flammability tests.
在这项工作中，研究了液滴尺寸和反应时间对明胶与α-[3-(2,3-环氧丙氧基)丙基]-ω-丁基-聚二甲基硅氧烷（PDMS-E）乳液液滴之间吸附-反应过程的影响。在0-75分钟范围内，明胶分子仅物理吸附在PDMS-E液滴表面，这与液滴尺寸（100-1000纳米）无关。对于小尺寸液滴（<410纳米），物理吸附持续75分钟以上，随后发生团聚。对于中等尺寸液滴（410-680纳米），物理吸附在125分钟时完成；随后，伯氨基与环氧基之间的亲核反应开始发生，并形成球状或核壳胶体颗粒。对于大尺寸液滴（>680纳米），亲核反应在75分钟时发生，并产生核壳或多层胶体颗粒。总之，通过控制液滴尺寸和反应时间，可以控制明胶与PDMS-E乳液液滴之间的物理吸附或亲核反应。此外，涂覆有大尺寸液滴的软组织纸表现出优异的抗水渗透性和阻燃性能，这是通过耐水性和可燃性测试得出的。
