仿生黏附性聚多巴胺丁香酚抑菌微胶囊的制备

以丁香酚(EO)为芯材,盐酸多巴胺(DA)为壳材,通过乳液模板-界面聚合法成功制备出尺寸可控的聚多巴胺丁香酚(PDA@EO)微胶囊.通过FTIR、TG、UV-Vis、SEM和TEM对微胶囊的化学结构、形貌、粒径及性能进行表征和分析.结果表明,所制备的微胶囊呈规整球形,粒径在55～94 nm之间,丁香酚最大包封率为22....     

基于聚多巴胺包覆的光热相变微胶囊的制备及性能

以正十八烷(n-OD)为芯材,二氧化硅(SiO2)和聚多巴胺(PDA)为复合壁材,采用界面水解缩合法成功制备光热相变微胶囊n-OD@SiO2/PDA.采用FESEM、FETEM、FTIR、DSC、TG、UV-Vis-NIR和模拟光源等对所制备了微胶囊的表面形貌、化学结构、热性能、光吸收性能和光热转换性能进行了分析和表征...     

硅油微胶囊的制备及其仿生防污性能的研究

以甲基硅油为芯材、脲醛树脂为壁材,通过细乳液聚合法制备脲醛树脂(PUF)/硅油微胶囊,探究了微胶囊的形成机理及乳化剂、搅拌速度对微胶囊的影响。通过光学显微镜(OM)、扫描电子显微镜(SEM)、热重分析(TGA)、红外光谱(FT-IR)等手段表征了微胶囊的形貌、热力学及价键结构等性能。结果表明:用细乳液聚合法成功制备了表面光滑、粒径分布均匀的微胶囊;微胶囊包覆率达到91%,且具有良好的缓释效果。将制得的微胶囊掺杂到丙烯酸锌树脂中制备防污涂层,研究了防污涂层的防污性能。采用SEM分析了防污涂层的形貌,并通过接触角测试及防污试验考察了防污涂层的疏水性及抑菌抑藻效果。结果表明:防污涂层表面形成类似荷叶表面的微纳米结构,涂层的疏水性增加,接触角由98.2°增加到123.9°;在抗藻抗菌类试验中显示出良好的防污性能。     

温度感应型微胶囊的制备研究

以温敏物质N-异丙基丙烯酰胺和丙烯酰胺为壁材,环己烷为分散介质,采用乳液聚合法制备温度感应型微胶囊。通过单因素试验研究了乳化剂的量、搅拌速度、物料比及交联剂的量对微胶囊制备的影响,确定了微胶囊制备工艺条件的最佳范围。     

牛至精油微胶囊抑菌效果研究

选用明胶、阿拉伯胶为壁材,采用复凝聚法制备了明胶/阿拉伯胶牛至精油微胶囊,研究该微胶囊对大肠杆菌、金黄色葡萄球菌、番茄灰霉菌、番茄早疫菌的抑制效果。结果表明,牛至精油微胶囊的包埋率为80.34%,产率为83.69%,牛至精油经微胶囊化后对四种供试菌株的抑制效果更加持久。     

牛至精油微胶囊抑菌效果研究

选用明胶、阿拉伯胶为壁材,采用复凝聚法制备了明胶/阿拉伯胶牛至精油微胶囊,研究该微胶囊对大肠杆菌、金黄色葡萄球菌、番茄灰霉菌、番茄早疫菌的抑制效果。结果表明,牛至精油微胶囊的包埋率为80.34%,产率为83.69%,牛至精油经微胶囊化后对四种供试菌株的抑制效果更加持久。     

界面聚合法制备聚硫脲缓释微胶囊的研究

以对苯二甲酰异硫氰酸酯与邻苯二胺为原料,通过界面聚合法合成了一种新型聚硫脲微胶囊,考察了搅拌速率、乳化剂用量、投药量等因素对微胶囊粒径及释放性能的影响。     

基于聚多巴胺药物载体的制备及其性能研究

多巴胺因优异的生物相容性受到广泛关注。本文以二氧化硅(SiO_2)微球为模板,在碱性条件下使多巴胺(DA)在其表面氧化自聚形成稳定的壳层,除去模板后制备空心聚多巴胺(HPDA)纳米粒子。为提高HPDA的稳定性并延长药物体内循环时间,将巯基壳聚糖(CS-SH)经迈克尔加成反应包覆在HPDA纳米粒子表面,得到HPDA@CS复合纳米颗粒,探索其结构、形态及其载药后的性能,结果表明该药物载体在PBS中能长期保持稳定,且HPDA@CS复合纳米颗粒对于阿霉素(DOX)具有更高的药物包封率。     

聚乳酸/聚多巴胺复合材料的制备及性能研究

聚乳酸(PLA)被认为是一种无毒、生物相容性优异的生物可降解材料,但其降解周期长、缺乏功能性而限制了其更广的应用。为改善聚乳酸(PLA)的各项性能,选用聚多巴胺纳米粒子(PDA NPs)作为纳米填料,通过溶液浇铸的方法制备了聚乳酸/聚多巴胺(PLA/PDA NPs)复合材料。结果表明,所制备的PDA NPs呈规则、均一的球形结构,且可通过改变介质pH调控粒径在140～550 nm;PDA NPs的加入可降低复合材料的冷结晶温度(T_c)和结晶度(X_c);但却能显著提升复合材料的降解速率,且其降解速率先较平缓后明显加快,最终降解20 d后降解率达到95.3%,比纯PLA加快了1倍。此外,PLA/PDA NPs复合材料被发现还具有紫外屏蔽性能,复合材料对UVA和UVB的屏蔽率分别高达65.98%和71.49%,是纯PLA的紫外屏蔽性能的2倍。     

聚乳酸/聚多巴胺复合材料的制备及性能研究

聚乳酸(PLA)被认为是一种无毒、生物相容性优异的生物可降解材料,但其降解周期长、缺乏功能性而限制了其更广的应用。为改善聚乳酸(PLA)的各项性能,选用聚多巴胺纳米粒子(PDA NPs)作为纳米填料,通过溶液浇铸的方法制备了聚乳酸/聚多巴胺(PLA/PDA NPs)复合材料。结果表明,所制备的PDA NPs呈规则、均一的球形结构,且可通过改变介质pH调控粒径在140～550 nm;PDA NPs的加入可降低复合材料的冷结晶温度(T_c)和结晶度(X_c);但却能显著提升复合材料的降解速率,且其降解速率先较平缓后明显加快,最终降解20 d后降解率达到95.3%,比纯PLA加快了1倍。此外,PLA/PDA NPs复合材料被发现还具有紫外屏蔽性能,复合材料对UVA和UVB的屏蔽率分别高达65.98%和71.49%,是纯PLA的紫外屏蔽性能的2倍。     

Preparation,characterization, and antibacterial activity of cationic nanopolystyrenes

Cationic nanopolystyrenes (CNPSs) were prepared by the polymerization of styrene with a cationic polymerizable emulsifier, N-(2-(methacryloyloxy)ethyl)-N,N-dimethyltetradecane-1-ammonium bromide (MDTB), in the presence of 2,2′-azobis(2-methylpropionamidine) dihydrochloride (APPH). The polymerization kinetics was investigated through monomer conversion versus polymerization time. ¹H NMR spectra and FTIR spectra were used to confirm the structures of MDTB and nanopolymers. The particle size, ζ-potential, molecular weight, and thermal stability were also investigated by Zetasizer, gel permeation chromatography, and thermogravimetric analysis, respectively. The antibacterial activities of the obtained products were evaluated by minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) against Staphylococcus aureus ATCC 29913 (S. aureus, a Gram-positive bacterium) and Escherichia coli ATCC 25922 (E. coli, a Gram-negative bacterium). The results indicated that the polymerization has the characteristics of microemulsion polymerization, all nanopolystyrenes are cationic and can be stored in the form of a microemulsion in aqueous phase, CNPSs present stable chemical structure at 190 °C, and their MIC and MBC reach 0.0625 and 0.125 mg mL⁻¹ for E. coli, 0.0325 and 0.0625 mg mL⁻¹ for S. aureus, respectively. Therefore, CNPSs are a promising new type of polymer antimicrobial agent, which can be used in the development of antimicrobial polymer materials and their products. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48405.     

抗菌塑料母料的制备及其抗菌性能研究

本文选用了Zn-Ag系及Ag系无机抗菌剂，采用双螺杆挤出法和单螺杆挤出法制备抗菌母料，测定2种方法制备的母料的抗菌性能，结果表明，双螺杆挤出法制备的抗菌母料具有较好的抗菌性能，选用Ag系无机抗菌剂制备的抗菌母料比Zn-Ag系抗菌母料抗菌性能好。     

壳聚糖/明胶抗菌微胶囊的制备及其应用

为了制备用于棉织物天然抗菌整理剂,以绿苋、龙葵和黄柏的复配提取物为芯材,壳聚糖-明胶为壁材,采用复凝聚法制备抗菌微胶囊。研究了乳化剂含量、剪切速度、pH对微胶囊的外观形态及尺寸的影响;借助扫描电子显微镜、傅里叶红外光谱仪等对样品进行表征;将抗菌微胶囊用于棉织物的整理并测试其抗菌性能。结果表明：初乳中乳化剂质量分数为5%、剪切速度为8000r/min、pH为5.7为最佳制备条件,制得的微胶囊尺寸分布在1480～3580nm且热稳定性良好;当微胶囊质量浓度为25g/L,黏合剂质量分数为5%,热烘温度为40℃,整理试样对金黄色葡萄球菌和大肠杆菌的抑菌率分别为89.30%和81.43%,且抑菌效果持久。     

微胶囊的制备技术及其应用

综述了微胶囊的制备技术及其应用,介绍了微胶囊技术在国内的研究进展。     

抗菌聚丙烯的制备及其抗菌性能

采用熔融接枝法将反应性有机抗菌剂接枝到聚丙烯上得到抗菌聚丙烯.通过控制有机抗菌剂的添加量,成功制备了一系列抗菌聚丙烯,研究了其对大肠杆菌和金黄色葡萄球菌的抗菌性能以及持久抗菌效果,并与采用共混法制备的抗菌聚丙烯进行比较.结果表明:采用熔融接枝法制备的抗菌聚丙烯的抑菌效率大于99％,所需最低抗菌剂含量为1％(w);通过反...     

Synthesis of isocyanate microcapsules as functional crosslinking agent for wood adhesive

ABSTRACT

In this study, controlled-release isocyanate microcapsules were synthesized as functional crosslinking to slowdown the rate of cross-linking reactions. The isocyanate microcapsules were prepared by In-situ polymerization with polymethylene polyphenyl polyisocyanates (PAPI) as core and Urea formaldehyde resin as shell in oil-in-water emulsions. The particle size distribution, chemical structure, morphology, activity, and stability of the microcapsules were comprehensively characterized. Finally, the microcapsules were applied in a wood adhesive to prepare water-resistant plywood. The results showed that the size of the microcapsules was around 100 μm, the active content of NCO was about 23.5%, and the core content was approximately 80%. Compared with the stability of the bulk isocyanate, the stability of the isocyanate in microcapsules was significantly improved in the wood adhesive system. Furthermore, the isocyanate microcapsules showed highly efficient in plywood at different time, which indicated that isocyanate microcapsules could be controllable released in plywood applications.     

环氧树脂微胶囊的制备研究

以脲醛树脂为壁材,E-51环氧树脂为囊芯,通过原位聚合法制备了环氧树脂微胶囊。探讨了反应过程中脲醛量比及反应温度、体系pH值、搅拌速度等实验条件对微胶囊表面形貌、结构、粒径及其分布和包封率的影响。并通过多种方法对微胶囊进行了检测和表征,在此基础上提出了制备环氧树脂微胶囊的最佳反应条件:n(尿素):n(甲醛)=1:2．0,以NH4Cl为酸性催化剂,催化剂分批加入,酸化3h,终点pH为2．0,反应温度70℃,搅拌转速450r／min,固化2h。     

缓释型香精微胶囊的制备及应用

采用原位聚合法制备一系列具有不同缓释性能的香精微胶囊。激光粒度仪测得随壁材用量的增加制得的香精微胶囊平均粒径呈增大趋势,并且m(壁材)∶m(芯材)=0.25∶1制得的微胶囊粒径分布最为集中。热重法测得单壁微胶囊90℃以下匀速失重,90℃~140℃加速失重,170℃后失重率极小;双壁微胶囊的失重速率明显小于单壁微胶囊,且基本匀速失重。紫外分光光度法得出双壁微胶囊释放速率明显小于单壁微胶囊,香精残留量可于30 d后仍保持一个较高水平。若将香精微胶囊应用于棉织物的加香整理,织物可保持5个月以上的留香效果。     

Preparation of 2,4-dichlorophenoxyacetic acid loaded on cysteamine-modified polydopamine and its release behaviors

With dopamine as the monomer, the model pesticide 2,4-dichlorophenoxyacetic acid (2,4D) was loaded on cysteamine (NHSH)-modified polydopamine (PDA) nanospheres [2,4-dichlorophenoxyacetic acid bound to cysteamine-modified polydopamine (2,4D–PDA–NHSH)] via the construction of amide bonds. We investigated the materials’ structure, adhesive capability, and release behaviors, especially the mechanism of the release processes. The results demonstrate that the materials were spherical in appearance and adhesive. 2,4D loaded on the PDA vehicle was amorphous in structure. The amide bond between PDA and 2,4D generated by NHSH not only enhanced the loading amount of PDA from 296.28 to 692.56 mg/g but also decreased the thermal stability from 291 to 230 °C. The 2,4D–PDA–NHSH showed no pH responsiveness, whereas the PDA system without NHSH modification exhibited pH sensitivity. A mechanism for the observed behaviors was suggested. First-order, logistic, Weibull, and Korsmeyer–Peppas models were applied to describe the release behaviors at different pH values. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47469.