具有温敏性的Diatomite@PNIPAm稳定Pickering乳液的制备及表征
Preparation and research of Diatomite@PNIPAm-stabilized Pickering emulsion with temperature responsiveness
王传浩 1王铭野 1刘莹 1王永泉 1宋雨桐 1周超1
作者信息
- 1. 长春工业大学 化学工程学院,长春 130012
- 折叠
摘要
针对由表面活性剂所稳定的乳液具有毒性且不环保的缺点,对硅藻土颗粒(Diatomite,DE)进行改性,并对其所制备的具有温度响应性的Pickering乳液进行了研究.由于硅藻土颗粒具有生物相容性好的优势,在化妆品和制药领域具有应用潜力.先通过硅烷偶联剂(MPS)疏水改性DE得到Diatomite@MPS,再接枝温敏型聚合物聚 N-异丙基丙烯酰胺(PNIPAm),成功合成了具有温度响应性的改性硅藻土颗粒(Diatomite@PNIPAm).由TGA结果表明制备Diatomite@PNIPAm的最佳MPS与NIPAm摩尔比为 1∶1.随后,将Diatomite@PNIPAm作为乳化剂分别在不同浓度的条件下制备了水包油(O/W)型Pickering乳液,确定了 3.0wt％为最佳浓度.此外,确定Diatomite@PNIPAm浓度后,分别从 1∶9到 9∶1的不同油水体积比制备乳液,结果表明油水体积比为 7∶3时最佳.通过差示扫描量热仪(DSC)测定所制备的Pickering乳液的低临界溶解温度(LCST)为 40℃,且乳液至少可以进行 6次破乳-再乳化循环,具备良好的破乳-再乳化循环性能.
Abstract
Aiming at the shortcomings of the emulsion stabilized by surfactant due to toxicity and non-environment-al protection,modified diatomite particles(DE),the temperature-responsive Pickering emulsion was studied.Due to the advantages of superior biocompatibility,DE have application potential in the field of cosmetics and pharma-ceuticals.First,the Diatomite@MPS was obtained by silane coupling agent(MPS)hydrophobic modified DE.Then,modified DE(Diatomite@PNIPAm)with temperature responsiveness was synthesized successfully by grafting the temperature-responsive polymer poly N-isopropylacrylamide(PNIPAm).According to the characterization results of FTIR testing and water contact angle testing,the diatomaceous earth was modified successfully.The TGA results showed that the optimal molar ratio of the Diatomite@PNIPAm prepared from MPS to NIPAm was 1∶1.Subsequently,oil-in-water(O/W)Pickering emulsions were prepared with Diatomite@PNIPAm as an emulsifier at different concentrations,and 3.0wt％was determined as the optimal concentration.In addition,the emulsion was prepared with different oil-water volume ratios from 1∶9 to 9∶1 after determining the Diatomite@PNIPAm con-centration,and the results showed that the oil-water volume ratio was 7∶3 as the best.The characterization results of differential scanning calorimeter(DSC)testing showed that the lower critical solution temperature(LCST)of the Pickering emulsion was 40℃.The emulsion can undergo at least 6 demulsification-reemulsification cycles,and possesses excellent demulsification-reemulsification cycle performance.
关键词
温度响应性/Pickering乳液/硅藻土/低临界溶解温度/破乳-再乳化循环性能Key words
temperature-responsive/Pickering emulsions/diatomaceous earth/lower critical solution tempera-ture/demulsification-reemulsification cycle performance引用本文复制引用
出版年
2024
NETL
NSTL
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