UCST型凝胶是一种温度响应性保水材料，能够发生在相变温度之上吸液溶胀而在相变温度之下释液收缩的现象。云南省制糖业每年约有200万吨蔗渣产生，但综合利用率低。结合本省旱区气候特点，项目以蔗渣为原料进行物理筛分获得薄壁细胞，分析其脱木素前后的组织形态、化学成分的构成和在细胞壁中的分布，并通过微波/碱处理分离纤维素和半纤维素，建立高效多糖分离模式；每类多糖分别进行伯羟基选择性氧化反应和阳离子醚化改性；进而应用接枝共聚及IPN改性方法，合理组入上述两类功能基团，着重探究实现蔗髓多糖UCST保水凝胶的理想方式及相应的评价体系，并揭示凝胶温敏机制；研究凝胶物化构成和外界溶液性质对温度响应性能的协同关系，构建有效的温敏调控途径。预期研究成果为蔗髓薄壁细胞多糖组分转化成温控保水型高分子，提升土壤抗旱能力，为此类废弃生物质高值化利用提供理论和应用基础。

UCST (Upper Critical Solution Temperature) hydrogel, which exhibits a pulsatile pattern in aqueous solutions, signifying hydration of polymer chains above critical volume phase transition point and polymer dehydration at lower temperatures, is a kind of novel thermo-responsive water-retention materials. Two million tons of bagasse are annually yielded in the Yunnan Province, but the comprehensive utilization rate of this resource is low because of the dominant presence of non-fibrous parenchyma cells. Based on the climate peculiarity at drought regions in Yunnan, the objective of this study is to make parenchymas form temperature-sensitive superaborent. Bagasse is selected for preparation of parenchyma cells by the means of physical sieve-treatment, and the morphology, chemical composition and distribution in both parenchymas and delignified parenchymas will be analyzed, respectively. On the basis of the parenchyma holocellulose, the high-efficient technology related to the separation of cellulose and hemicellulose will be established through the microwave-assisted heat process under the alkaline condition. Subsequently, the primary-hydroxyl regioselective oxidization and quaternary-ammonium etherization of each kind polysaccharide will be studied, respectively. Afterwards we will focus on researching the ideal technique and corresponding evaluation system of UCST water-retention hydrogel prepared by graft copolymerization and IPN modification of the two functional groups mentioned above. And the thermo-sensitive mechanism of polysaccharide-derivative hydrogels will also be explored. Then, the temperature-responsive regulation pathway will be effectively built through the investigation of synergistic relationship between temperature response and gel characterization as well as solution property. The research of this project will provide the academic and technological bases for the value-added utilization of such waste biomass as bagasse parenchyma cells, in which the polysaccharides are converted into temperature-controlled and water-retentive macromolecules for increasing soil drought-resistance.