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Synthesis and Properties of Thermosensitive 3-Alkoxy-2-Hydroxypropyl Starch Derivatives

Author: YangJinDong
Tutor: JuBenZhi
School: Dalian University of Technology
Course: Applied Chemistry
Keywords: Hydrophobic modified starch Temperature-sensitive Micelles Self-assembly performance
CLC: TS236.9
Type: Master's thesis
Year: 2011
Downloads: 60
Quote: 0
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Abstract


Of corn starch as raw material, to 2 - [(2 - butoxyethoxy) methyl] oxirane, 2 - [(2 - (2 - butoxyethoxy) ethoxy)-methyl yl] oxirane, 2 - [(2 - hexyloxy-ethoxy)-methyl] oxirane as a hydrophobic reagent, sodium hydroxide as a catalyst, water as a solvent to prepare a series containing the type B the number of oxygen chain and different hydrophobic chain ether starch. Mass spectrometry characterization of hydrophobic etherifying agent, verify that the structure of etherification agent accurate. 1H-NMR were used to characterize the etherified starch containing different ethoxy chain and the type of hydrophobic chain and to determine the age of the etherified starch substituted. Experiment by adjusting the proportion of the glucose units of the the etherifying agent with starch to change its degree of substitution was investigated different degree of substitution for all age etherified starch solubility in water and an organic solvent. Investigated the relationship between the product of a surfactant with an etherification degree of substitution of the starch with the degree of substitution increases, the surface tension of the product are relatively small. And 2 - hydroxy-3 - (2 - butoxyethoxy) propyl starch ether, 2 - hydroxy -3 - [2 - (2 - butoxyethoxy) ethoxy] propyl starch ether a temperature-sensitive starch materials, responsive to changes in temperature, and 2 - hydroxy-3 - (2 - hexyloxy-ethoxy) propyl starch ether does not have a temperature response is a class of amphiphilic starch polymer. In addition, the paper also examines the temperature sensing properties contain a different number of ethoxy chain ether starch. In this paper, the performance of the temperature-sensitive ether starch etherification of starch cmc values ??determined by different methods, found that such amphiphilic temperature-sensitive starch has a lower cmc cmc values ??with with the degree of substitution increases. Temperature-sensitive materials micelle self-assembly behavior by fluorescence techniques and dynamic light scattering study. Pyrene fluorescence spectra of the of amphiphilic starch solution micelles self-assembly of micelles in response to temperature changes of the micelle particle size by dynamic light scattering. In addition, by UV-visible spectrophotometer two types of temperature-sensitive starch lower critical solution temperature (LCST), and the effects of concentration and salt LCST value, but also compared the number of ethoxy chain LCST value, two types of temperature-sensitive ether starch LCST value can be changed by the degree of substitution of the control in different temperature ranges.

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CLC: > Industrial Technology > Light industry,handicrafts > Food Industry > Starch Industry > Starch processing products > Other
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