Synthesis of a novel UV-curable prepolymer neopentyl glycol diglycidyl ether diacrylate and its cured film tensile property

A novel UV-curable prepolymer neopentyl glycol diglycidyl ether diacrylate (NPGGEA) was synthesized by using neopentyl glycol diglycidyl ether (NPGGE) and acrylic acid (AA) as starting materials, N, N-dimethylbenzylamine as catalyst and p-hydroxyanisole as inhibitor. The optimum synthetic conditions were taken as follows: The concentration of N,N-dimethylbenzylamine, 0.80% of reactants; the concentration of p-hydroxyanisole, 0.3% of reactants; the reaction temperature, 90-110 ; the molar ratio of NPGGE to AA, 1:2.2. Meanwhile, 1-hydroxycyclohexyl phenyl ketone of a UV-cured initiator was added to the synthesized NPGGEA to prepare a kind of UV-cured coating. Mechanical properties of the UV-cured films were determined, giving 28.75 MPa of tensile strength, 923.82 MPa of Young’s modulus and 5.51% of elongation at tear.

泡沫多孔吸水材料的制备与性能研究

以改性微晶纤维素(MCC)和壳聚糖(CS)为原材料,通过添加十二烷基磺酸钠(SDS)和新戊二醇二缩水甘油醚(NGDE)制备了一种新型泡沫吸水材料。利用SEM、FT-IR、XRD和BET对吸水材料的结构进行表征。结果表明,当SDS质量分数为4%、NGDE质量分数为4%时,其吸水效果最高,能够吸收120 g/g去离子水,在盐水中能够达到62 g/g,具有良好的保水性能和再膨胀性能。

纤维素多孔吸附材料的制备

将纤维素溶解在氢氧化钠/尿素/水溶液中,与新戊二醇二缩水甘油醚(NGDE)发生交联反应,经过离心水洗纯化后冷冻干燥,制备了纤维素多孔材料。采用傅里叶变换红外光谱(FT-IR)、X射线衍射(XRD)、热重分析(TGA)和扫描电镜(SEM),对制备的纤维素多孔吸附材料的化学结构、晶型结构、热稳定性及微观形貌进行表征。研究了NGDE的用量和水凝胶质量分数对纤维素多孔材料的密度及吸水性能的影响。结果表明,4 g纤维素溶于100 g NaOH/尿素/水(质量比为7∶12∶81)溶液中制得纤维素溶液,在NGDE的用量18 m L,水凝胶质量分数为1.5%时,制备的纤维素多孔材料的密度为15.7 mg/cm3,吸水倍数达37倍,对此条件下制备的纤维素多孔材料进行结构分析,表明纤维素多孔材料具有连续的网状孔结构,纤维素的晶型由纤维素Ⅰ型转变为非晶态结构,初始热分解温度在250℃以上,热稳定性好。

单宁改性大豆蛋白胶粘剂研究

采用新戊二醇二缩水甘油醚(ER)和单宁对大豆蛋白胶粘剂改性。通过测定胶粘剂的残留率、胶合强度以及红外光谱及电镜分析研究了单宁加入量对胶粘剂性能的影响。结果表明:ER和单宁与蛋白分子上的活性基团反应,形成更加致密的交联结构,增强了胶粘剂的耐水胶接性能。大豆蛋白胶粘剂体系中加入质量分数2%的ER和4%的单宁后,其耐水性提高8.7%,残留率达82.7%,以其制备的胶合板的胶合强度达到1.01 MPa,较未改性胶粘剂提高225.8%,满足室内用胶合板标准要求。