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首页> 外文会议>North American Thermal Analysis Society Conference >Thermal Analysis Characterization of Isosorbide Containing Thermoplastics and Thermosets: Isosorbide Epoxy as BPA Replacement for Thermosets
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Thermal Analysis Characterization of Isosorbide Containing Thermoplastics and Thermosets: Isosorbide Epoxy as BPA Replacement for Thermosets

机译：含有热塑性塑料和热固性的异山梨醇的热分析表征：异山梨醇环氧作为热固性型的BPA替代品

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Sugar based new monomers, polymers and low molar mass additives have emerged as an exciting topic on green chemistry research, due to the world wide focus on sustainable material. Isosorbide and its isomers are by products of the starch industry obtained by reduction of hexose sugars followed by dehydration. As GRAS materials, i.e, "generally recognized as safe", isosorbide with its unique stereochemistry and molecular geometry provides a ubiquitous platform for making cost effective chemicals and polymers. The growing awareness of bisphenol A (BPA) as a xenoestrogen, which possesses the ability to mimic estrogen and cause feminizing effects in living creatures, drives the development of bio-derived replacement of BPA. Isosorbide and its isomers are rigid organic diols with the similar structure to that of BPA but without the endocrine disrupting effect. With their remarkable chemical properties and attractive price, those dianhydrohexitols can be attached to glycidyl ether to make crosslinkable epoxy resin monomer with similar properties to bis-A diglycidyl ether. The chemical structure and property of the synthesized epoxy monomer and polymer were characterized by DSC, TGA, DMA and TMA, proton nuclear magnetic resonance spectroscopy (~1H NMR) and epoxy equivalent titration according to ASTM D1652-04. Since isosorbide is hydroscopic, one liter of water can dissolve 8 kg of isosorbide which functions like a cyclized polyethylene glycol. With different hardening agents like the primary and secondary amines or anhydrides, the pure isosorbide epoxy resin can be converted from the thermoplastic state to tough, hard, thermosets with properties such as excellent adhesion, high chemical or heat resistance and good-to-excellent mechanical properties. The water uptake ratio of isosorbide epoxy could range from below 1% to above 50%, which was characterized by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). By adding a hydrophobic functional group into the backbone of isosorbide epoxy or adjusting the amount and type of crosslinker, the mechanical property and water uptake ratio of the isosorbide derived epoxy could be optimized for different applications. The high water uptake epoxy with controllable biodegradation rate could be used as a drug delivery system or extracellular matrix for biomedical applications while the low water uptake epoxy with strong mechanical properties could be used for can coatings, bone cements and other industrial additives and adhesives. Thermal analysis has proven a valuable tool in understanding the process-structure-property relationships of these new and novel materials.
机译：糖基新单体，聚合物和低摩尔大规模添加剂已成为绿色化学研究的令人兴奋的话题，由于全球对可持续材料的关注。异山梨醇和其异构体是通过通过减少己糖糖而获得的淀粉工业的产品，然后进行脱水。作为GRAS材料，即“普遍认为是安全”的，具有其独特的立体化学和分子几何形状的异山梨体提供了一种普遍存在的平台，用于制造成本有效的化学品和聚合物。对双酚A（BPA）作为异雌激素的越来越感知，具有模拟雌激素的能力并导致生物生物中的女性化影响，驱使生物衍生的BPA的替代品。异山梨醇及其异构体是刚性有机二醇，其结构与BPA类似但没有内分泌破坏效果。凭借其显着的化学性质和有吸引力的价格，那些脱羟基己溶胶可以与缩水甘油醚连接，使可交联的环氧树脂单体具有与双-A二缩水甘油醚相似的性质。根据ASTM D1652-04，通过DSC，TGA，DMA和TMA，质子核磁共振光谱（〜1H NMR）和环氧当量滴定，表征了合成的环氧单体和聚合物的化学结构和性质。由于异山梨醇是含水性的，因此一升水可以溶解8千克的异山梨果，其功能类似于环化的聚乙二醇。用不同的硬化剂如初级和仲胺或酸酐，纯的异山梨醇环氧树脂可以从热塑性状态转化为坚韧的，硬质，具有优异的附着力，高化学或耐热性和良好的机械性能特性。异山梨醇环氧树脂的水吸收比率低于1％至高于50％，其特征在于差示扫描量热法（DSC）和热重分析（TGA）。通过将疏水性官能团添加到异山梨醇环氧基的骨架中或调节交联剂的量和类型，可以针对不同应用优化异山梨醇衍生环氧树脂的机械性能和水吸收比。具有可控生物降解速率的高水吸收环氧可以用作生物医学应用的药物输送系统或细胞外基质，而具有强力机械性能的低水吸收环氧树脂可用于罐涂层，骨水泥和其他工业添加剂和粘合剂。热分析证明了理解这些新和新颖材料的过程结构性质关系的宝贵工具。

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