基于硼酸酯黄酮苷分子印迹聚合物的制备及识别性能研究

分别以芦丁和柚皮苷为模板分子,4-乙烯基苯硼酸为功能单体,乙二醇二甲基丙烯酸酯为交联剂,1,4-二氧六烷为致孔剂,偶氮二异丁腈为引发剂,采用可逆共价结合方式制备出两种基于硼酸酯结合的分子印迹聚合物,并对它们的吸附介质、结合动力学速率、专一识别性和交叉选择性进行了研究。结果表明,可逆共价印迹聚合物适用于水相介质,在3 h内可以达到吸附平衡。选择性结合实验表明该两种MIP具有良好的分离选择性,其对各自的模板分子均表现最大的吸附量,而对其结构类似物吸附较少。     

新型防水材料的应用及其与常用防水材料的对比

通过近年来对新型防水材料的工程设计和应用实践,对渗透结晶型防水材料的特点和适用性进行了分析和研究,提出了"以刚性为主、柔性为辅"的新防水结构体系。同时通过对比指出了常用防水材料的缺陷。     

竞争性反转录聚合酶链反应对髌韧带中的α_1-Ⅰ型胶原蛋白基因表达的定量检测

应用竞争性反转录聚合酶链反应技术,对韧带中的α_1-Ⅰ型胶原蛋白基因表达进行了定量测定。研究表明:该技术是适用于对一小块髂韧带中的基因表达进行定量研究。     

Effect of chloride content on bond behavior between FRP and concrete

For reinforced concrete structures located along the seaside, the penetration of chloride ions into concrete may be a threat to the durability of the structures. Experimental investigations were carried out to study the effect of chloride content on the bond behavior between concrete and fiber reinforced polymer (FRP) plates. Direct shear tests were conducted on the FRP strengthened concrete members. Before testing, the specimens were immersed in NaCl solutions with concentrations ranging from 3%—15% for different time (0—120 d). Then, the specimens were dried and tested to obtain the initial and ultimate debonding loads, together with strain distributions along the FRP plates of different load values. The correlations between chloride content and debonding parameters are established. Test results show that the debonding parameters are closely related to the immersing time rather than the chloride content of the solution.     

手性锌配位聚合物[Zn(2-PEBA)_2]_n的合成和荧光性质

在水热条件下,4-[2-(2-吡啶)-乙烯基]苯甲酸(2-PEBA)和Zn(OH)2反应得到一种石英结构的手性三维配位聚合物[Zn(2-PEBA)2]n(1),这种配位聚合物的固体粉末在室温下用波长为353 nm的激发光激发,能发出蓝色荧光(λmax=470 nm).配合物1的晶体数据为:C28H20N2O4Zn,M=513.83,六方晶系,手性空间群为:P6522(D63),a=b=0.996 10(2)nm,c=5.70 24(2)nm,α=β=90°,γ=120°,V=4.900 0(2)nm3,Z=6,Dc=1.045 mgm-3,R1=0.089 4,wR2=0.259 8,μ=0.779 mm-1,S=1.307,Flackχ=0.10(5).     

由2,4-吡啶二甲酸构筑的锌的配位聚合物的水热合成及晶体结构

采用水热法合成了一维配位聚合物[Zn2(pydc)2(4,4’-bipy)(H2O)6]n.2nH2O(H2pydc=2,4-吡啶二甲酸,4,4’-bpy=4,4’-联吡啶),并对其进行了元素分析、红外光谱表征和X射线单晶衍射测定.该配合物属于单斜晶系,空间群为P2(1)/c,晶胞参数为:a=10.023(2),b=13.941(3),c=11.239(2),β=106.478(3)°,V=1505.9(5)3,C24H30N4O16Zn2,Mr=761.26,Dc=1.679g/cm3,μ(MoKα)=1.675mm-1,F(000)=216,Z=2,R1=0.0364,ωR2=0.0607.     

导电聚合物敏化纳米晶太阳能电池的研究进展

导电聚合物以其特殊能带结构以及对可见和近红外光的吸收等性质,目前越来越广泛地应用于光电化学太阳能电池.主要以聚邻甲氧基苯胺、聚噻吩及其衍生物、聚苯胺及聚吡咯为代表,简要介绍了目前导电聚合物作为纳米光电化学太阳能电池敏化剂的应用研究概况.     

机械工程材料课程中高分子材料的教学改革与实践

目前各高校机械工程材料课程均以金属材料为主线。近五十年来高分子材料异军突起,成为新型的工程材料,因此有必要在机械工程材料授课中增加高分子材料的比重并进行相应的改革。大连理工大学从授课内容、授课目标、授课过程、教学方式及参考教材等方面对机械工程材料课程中高分子材料部分进行了改革,实践表明教学改革取得了良好的效果。     

Experimental study on uniaxial time-dependent ratcheting of a polyetherimide polymer

The uniaxial ratcheting behavior of a polyetherimide （PEI） polymer ＇TECAPEI＇ was studied using stress-controlled cyclic loading at room temperature, including both cyclic tension-compression with non-zero tensile mean stress and tension- unloading tests. The experimental observations were focused on the time-dependent ratcheting of the PEI polymer revealed in cyclic tests at diverse stress rates and with different peak stress holding times. The results showed that the PEI polymer shows obvious ratcheting deformation; i.e., the ratcheting strain accumulates progressively in the tensile direction during stress- controlled cyclic tests with non-zero mean stress. The ratcheting is highly dependent on the applied mean stress and stress am-plitude, and is also characterized by a strong time-dependency during the cyclic stressing at diverse stress rates and with different peak stress holding times. The time-dependent ratcheting of the PEI polymer is caused mainly by its remarkable viscosity. A comparison of the ratcheting occurring before and beyond the ultimate stress point of the PEI polymer showed that the ratcheting beyond the ultimate stress point is more significant than that occurring before that point.     

FRP加固RC圆柱正截面受弯承载力计算（英文）

运用数值计算方法对FRP加固钢筋混凝土（RC）圆柱截面特性进行计算,发现截面破坏时受压区高度主要受轴压比、FRP约束强度比和纵筋配筋特征值3个主要参数影响.根据数值计算的结果进行回归,提出了受压区对应圆心角θ的计算方法.数值计算结果显示,横向约束导致的混凝土应力提高以及纵筋屈服后的强化效应使RC柱破坏时截面受弯承载力远大于规范规定值.根据理论分析和36个大比例试件实测结果提出截面破坏时受弯承载力计算方法,计算结果与试验结果吻合很好.最后,对一个典型柱变形能力进行参数分析,研究轴压比,纵筋配筋特征值和FRP约束强度比对正截面变弯承载力的影响.结果显示FRP加固圆柱破坏时受弯承载力可以比规范规定的未加固柱受弯承载力提高50%左右.