A novel facile two-step method for producing glucose from cellulose

A two-step acid-catalyzed hydrolysis methodology is established to effectively hydrolyze cellulose to glucose with high yield and selectivity under mild conditions. In multi-steps hydrolysis, the difficulty of cellulose can be effectively reduced under mild conditions. In the first step, microcrystalline cellulose was depolymerized in phosphoric acid to cellulose oligomer at 50 °C. Then the oligomer was precipitated by ethanol and hydrolyzed with dilute sulfuric acid in the second step. 87.7% total reducing sugars and 57.8% glucose was released from the two-step hydrolysis process. In addition, with the assistance of microwave in the second step, the yield and selectivity of glucose can be improved to 73.3% and 80.1% by only 5 min hydrolysis. The two-step hydrolysis exhibits an effective process to produce glucose in cellulose hydrolysis. The enhancement of hydrolysis reactivity is considered to be controlled with the decrease of crystallinity and degree of depolymerization of cellulose

How Does Epoxidized Soybean Oil Improve the Thoughness of Microcrystalline Cellulose Filled Polylactide Acid Composites?

Chemical effect is mainly utilized to induce the accumulation of epoxide soybean oil (ESO) on the surface of microcrystalline cellulose (MCC) particles as the formation of flexible layer to produce superior toughness of polylactide acid (PLA) composites. MCC is firstly maleated to produce appropriate chemical reactivity with ESO and thus ESO is induced to form a flexible layer around MCC particles by chemical reaction happened in melt-blending, which is proved by the results from XPS and contact angle measurements. This flexible layer increases the interfacial adhesion and provides an easy deformation region. As a result, high toughness is provided. The elongation and impact strength of PLA/ESO/MCC ternary composites can be respectively improved to 38.5% and 31.7 KJ/m 2 . This particular structure also helps to increase plasticization effect leading to a slightly decrease inTg. The whole process elaborates a simple but an effective methodology to improve the toughness of PLA/cellulose composite in virtue of chemical effect. Toughness of PLA/ESO/MCC composites can be also controlled by the degree of chemical reaction (adjusted by the substitution degree of MA on MCC). Fully biodegradable PLA/ESO/MCC composite with high toughness is finally fabricated

环丁砜辅助促进纤维素水解变糖效率研究

通过在纤维素水解体系中引入非质子型溶剂环丁砜,提升了纤维素的水解变糖效率,将纤维素发生快速水解的临界聚合度由51提升至64。经催化转化后,纤维素转化率和还原糖产率最高分别达到98.1%和74.8%

一种由富含纤维素的生物质制备羟基乙酸的方法

本发明公开了一种由富含纤维素的生物质制备羟基乙酸的方法，以富含纤维素的生物质为原料，将其浸润到经pH值调节剂调至弱酸性的氧化剂中，以亚铁盐为芬顿反应催化剂，锌盐为次级催化剂，在光照条件下进行芬顿反应，反应结束后，经过滤分离得到所述的羟基乙酸。本发明是通过光促芬顿反应产生自由基，同时用次级催化剂配合，实现产物的选择性调控。本方法制备羟基乙酸的步骤简单，不需加热加压，易于控制；所用催化剂的价格低廉，降解过程无需有机溶剂；在温和条件下即实现了产物的制备转化，相比现有的石油基来源的小分子原料转化法具有明显优势，是一种潜力巨大、高效经济的羟基乙酸生产方法

聚合物纤维固载型催化剂的制备与应用研究

发展高活性且可回收的催化剂成为近几十年研究的一个热点,本文系统地介绍了聚合物纤维固载型催化剂的制备技术,并简要阐述了其在各领域中的应用。与传统非聚合物纤维固载型催化剂相比,聚合物纤维固载型催化剂能同时满足高比表面积、易加工成型和易分离等要求,具有高催化活性和优良的循环使用性能。聚合物纤维制备技术和催化剂负载方法的发展,能够显著促进了以聚合物纤维材料为载体的高性能固载型催化剂的进步,在空气净化、污水处理和大型化工生产等领域具有重要的研究意义

热塑性聚酯弹性体及其制备方法与应用

本发明公开了一种热塑性聚酯弹性体，它主要由1,4-环己烷二甲酸或二甲酯与二元醇缩聚形成，且在所述弹性体的聚合物主链结构中，顺式1,4-环己烷二甲酸单元的含量不低于1,4-环己烷二甲酸单元总量的21摩尔%。本发明还提供了制备所述热塑性聚酯弹性体的方法，包括：将1,4-环己烷二甲酸或二甲酯、二元醇及催化剂混合，依次经酯化或酯交换反应、缩聚反应获得产物。本发明的热塑性聚酯弹性体具有优异的热稳定性、耐候性、抗紫外线性能、机械性能以及弹性回复性能，且制备工艺简单、可操作性强、可控性好，易于工业化实施，可在汽车零部件、管道阀件、电子器件、鞋材、瓶材和片材等领域广泛应用

一种2;5-二酰基呋喃化合物的制备方法

本申请公开了一种2,5-二酰基呋喃化合物的制备方法，通过将2,3-二甲酸酐-7-氧杂二环[2.2.1]庚-5-烯和-或呋喃与酰基化试剂发生酰基化反应，简便高效的制备出2,5-二酰基呋喃化合物。制备方法简单高效、流程短、副产物少，采用该方法制备的2,5-二酰基呋喃化合物纯度高，可满足作为高性能聚酯、环氧树脂、聚酰胺、聚氨酯等工程塑料的原料以及作为化工原料和医药中间体原料的要求

聚乳酸复合材料及其制备方法

本发明公开了一种聚乳酸复合材料及其制备方法。所述复合材料包括聚乳酸和含环己烷片段的聚酯改性剂，所述聚酯改性剂包括1,4-环己烷二甲酸与1,4-丁二醇的缩聚产物，以及该缩聚产物与己二酸丁二醇酯的共聚产物。本发明通过调控含环己烷片段的聚酯改性剂中顺式1,4-环己烷二甲酸的含量，可以使塑性材料转变为弹性体，同时通过调控含环己烷片段的聚酯改性剂中另一直链聚酯单元的含量，可以更为有效的使聚酯兼具较好的强度和弹性，从而使制备的复合材料具备超韧高强的机械性能。本发明还提供了制备所述聚乳酸复合材料的方法，该方法工艺简单、可操作性强、可控性好，易于工业化实施

一种2;5-二烷基呋喃化合物的制备方法

本申请公开了一种2,5-二烷基呋喃化合物的制备方法，通过将2,3-二甲酸酐-7-氧杂二环[2.2.1]庚-5-烯和-或呋喃与烷基化试剂发生烷基化反应，简便高效的制备出2,5-二烷基呋喃化合物。制备方法简单高效、流程短、副产物少，采用该方法制备的2,5-二烷基呋喃化合物纯度高，可满足作为高性能聚酯、环氧树脂、聚酰胺、聚氨酯等工程塑料的原料以及作为化工原料和医药中间体原料的要求