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林产化学与工业 ›› 2020, Vol. 40 ›› Issue (2): 69-75.doi: 10.3969/j.issn.0253-2417.2020.02.009

• 研究报告 • 上一篇    下一篇

无溶剂法制备丙烯海松酸蔗糖酯及其在空气-水界面吸附行为研究

周菊英1,2(),邹梦君1,廖华珍1,赵彦芝1,2,许海棠1,2,申利群1,2,*()   

  1. 1. 广西民族大学 化学化工学院, 广西 南宁 530006
    2. 广西林产化学与工程重点实验室, 广西 南宁 530006
  • 收稿日期:2019-09-16 出版日期:2020-04-28 发布日期:2020-04-27
  • 通讯作者: 申利群 E-mail:zhoujuying@126.com;liqunshen@126.com
  • 作者简介:周菊英(1979—),女,浙江桐庐人,教授,博士,研究方向为松香基功能材料的制备与应用; E-mail:zhoujuying@126.com
  • 基金资助:
    广西科技基地和人才专项(AD18126005);广西自然科学基金资助项目(2018GXNSFAA281243);广西民族大学民族医药重点实验室项目

Preparation of Acrylic Pimaric-sucrose Ester by Solvent-free Process and Its Adsorption Properties at Air-water Interface

Juying ZHOU1,2(),Mengjun ZOU1,Huazhen LIAO1,Yanzhi ZHAO1,2,Haitang XU1,2,Liqun SHEN1,2,*()   

  1. 1. School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning 530006, China
    2. Guangxi Key Laboratory of Chemistry and Engineering of Forest Products, Nanning 530006, China
  • Received:2019-09-16 Online:2020-04-28 Published:2020-04-27
  • Contact: Liqun SHEN E-mail:zhoujuying@126.com;liqunshen@126.com

摘要:

在无溶剂条件下,以丙烯海松酸和蔗糖为原料,在高温熔融状态下通过酯化反应制备了丙烯海松酸蔗糖酯,运用红外光谱、核磁共振和凝胶渗透色谱对其结构进行了表征,并测试了其临界胶束浓度(CMC),利用再定向理论分析了丙烯海松酸蔗糖酯表面活性剂在空气-水界面的形态转变和吸附量等吸附行为。研究结果表明:成功合成了丙烯海松酸蔗糖酯,其CMC值为2.2 g/L。丙烯海松酸蔗糖酯在空气-水界面的吸附状态分为状态1和状态2,随着表面压的增加,溶剂摩尔分数逐渐降低,2种状态丙烯海松酸蔗糖酯分子在空气-水界面上的摩尔分数之和逐渐增加。计算了吸附在界面上的状态1和状态2丙烯海松酸蔗糖酯的吸附量,随着表面压增大,状态1吸附量先增大后减小,状态2吸附量占主导且持续增多,吸附量最高可达1.9 mmol/m2。丙烯海松酸蔗糖酯的吸附和胶束化摩尔自由能(ΔG)分别为-20.67和-15.16 kJ/mol,表明丙烯海松酸蔗糖酯优先吸附在界面上,达到饱和后就形成胶束。

关键词: 丙烯海松酸蔗糖酯, 界面, 吸附行为

Abstract:

Acrylic pimaric-sucrose ester was synthesized from acrylamicarboxylic acid and sucrose by esterification at high temperature under solvent-free conditions, which structure was characterized by IR, NMR and gel permeation chromatography and critical micelle concentration (CMC) was measured. The reorientation theory was used to analyze the adsorption behaviors of acrylic pimaric-sucrose ester surfactant at the air-water interface, including morphological change and adsorption capacity. The results showed that the acrylic pimaric-sucrose ester was successfully synthesized by the method, and the CMC value the synthesized ester was 2.2 g/L. With the increase of surfactant concentration, the solvent molar fraction at the air-water interface decreased, while the molar fraction of acrylic pimaric-sucrose ester increased. The adsorption of acrylic pimaric-sucrose ester at the air-water interface was divided into state 1 and state 2, and the adsorption capacity on the interface was calculated respectively, which was up to 1.9 mmol/m2 in state 2. As the surface pressure increased, the number of molecules in state 1 increased first and then decreased, while the number of molecules in state 2 dominated and continued to increase. The molar free energies (ΔG) of adsorption and micelles of acrylic pimaric-sucrose ester were -20.67 kJ/mol and -15.16 kJ/mol, respectively, indicating that acrylic pimaric-sucrose ester was preferentially adsorbed on the interface and formed micelles after reaching saturation.

Key words: acrylic pimaric-sucrose ester, surface, adsorption behavior

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