以砂纸为模板制作聚合物超疏水表面

报道了一种聚合物材料超疏水表面的简便制备方法.以不同型号的金相砂纸为模板,通过浇注成型或热压成型技术,在聚合物表面形成不同粗糙度的结构.接触角实验结果证明,聚合物表面与水的接触角随着所用砂纸模板粗糙度的增加而加大,其中粒度号为W7和W5砂纸制作的表面与水的接触角可超过150°,显示出超疏水性质.多种聚合物使用砂纸为模均可制备不同粗糙度及超疏水的表面,本征接触角对复制表面浸润性的影响从Wenzel态到Cassie态而变小.扫描电镜结果表明,不规则形状的砂纸磨料颗粒构成了超疏水所需要的微纳米结构的模板

Study of PET fibers structure and their properties

涤纶是一种应用广泛的纺织材料，但由于大分子中缺少直接与染料结合的官能团，且涤纶的结晶度高、结构紧密，染料分子很难进入纤维内部，染色困难。改进PET纤维的染色性能具有重要意义。影响纤维及其纺织品染色性能的因素有很多。对纤维来说,首先是纤维的化学结构,主要有化学组成、聚合度、分子立体结构等；其次是超分子结构,主要是结晶度、晶粒大小、取向度或侧序度,无定形区大小和孔隙大小及分布等。本论文通过DSC、结晶速度测量、显微图像分析以及动态机械热分析确定了四种海岛纤维的结晶度、结晶速度、晶粒大小、玻璃化温度与染色性能的关系。结果表明：结晶度小，结晶速度慢，晶粒尺寸大,玻璃化温度低等等均有利于涤纶纤维染色性能...PET (Polyethylene terephthalae) is a kind of popular textile materials. However, the macromolecule is lack of the functional groups which can react with the dyestuff directly. And PET with high degree of crystallinity and tight structure which can have hydrogen bond with disperse dye. So it is hard for the dye molecule to get inside the fiber. It means PET is difficult to dye. That is why it is wi...学位：理学硕士院系专业：化学化工学院_高分子化学与物理学号：20043600

Study on the Synthesis and Curing of Waterborne Epoxy-acrylate Grafted Copolymers

环氧树脂与丙烯酸类单体接枝共聚是制备水性环氧树脂的一条重要途径.本文作者研究了多元接枝水性环氧树脂的合成,及其与固化剂双氰胺的固化工艺.讨论了单体配比、接枝反应温度、反应时间等因素对水性环氧乳液接枝率的影响,确定了较佳的工艺条件,通过红外光谱分析证实了丙烯酸接枝环氧共聚物的结构,并考察了漆膜的固化条件.所得涂膜附着力、柔韧性、硬度很好,能达到溶剂型环氧树脂防腐蚀涂料水平.The waterborne multi-graft epoxy resin is based on epoxy resin as parents,and α-methacrylic acid,styrene and butyl acrylate as grafted monomers with BPO as initiator,the synthesis of grafting epoxy copolymer and its curing by dicyandiamide have been studied in this paper,The reaction conditions affecting the grafting ratio of emulsion,such as the ratio of grafting monomers、grafting reaction temperature and reaction time were discussed,The results showed that when the ratio of α-methacrylic acid/ styrene/ butyl acrylate was 1564,grafting reaction temperature was 110℃～115℃,reaction time was 6h,the epoxy emulsion with most stability and highest grafting ratio would be obtainded.The structure of grafting epoxy copolymer is proved by analyzing infrared spectrum(IR).The conditions of curing were also investigated.A series of coating films of different curing temperature and quantity of DICY were prepared,the optimum conditions of curing were determined by testing degree of cross linking of the coating films and the coating films properties.The results showed that when the curing technics was 140℃/1h,and the mol ratio of epoxy group/ amino hydrogen of DICY was 10.4,the coating films have good properties of adhesion、flexibility and hardness,and it reach the standard of corrosion resistant solvent-borne epoxy coatings

鲤鱼多态性EST标记的筛选与特性分析

表达序列标签(Expressed sequence tag,EST)标记在基因组作图和分子标记辅助育种研究中具有重要价值。筛选和开发可用于遗传作图的鲤鱼多态性EST标记,对研究鲤鱼的基因组结构、遗传多样性研究和遗传育种有重要意义。本研究根据GenBank数据库中鲤鱼EST序列设计了67对EST引物,有47对在鲤鱼基因组DNA中成功扩增得到稳定的特异性条带,经单链构象多态性(SSCP)分析,12对(25.5%)引物扩增的EST在1个鲤鱼回交家系中具有多态性,其中6个为鲤鱼功能基因,5个与斑马鱼(Dani

Epoxy Resin Modified by Polysiloxane with Side Amino Group

采用八甲基环四硅氧烷(D4 )、甲基二乙氧基乙二胺丙基硅烷(DL 602)为单体,以六甲基二硅氧烷(MM)为封端剂合成不同粘度的侧氨基聚硅氧烷(SAPS),并用合成的侧氨基聚硅氧烷来改性环氧树脂(E 44),制备一系列的样品.通过动态机械热分析(DMTA)、接触角仪、电子拉力试验机以及扫描电镜(SEM)对其进行研究.结果表明对于含固定侧氨基比例的聚硅氧烷,其与环氧树脂的相容性随着聚硅氧烷的粘度先增大后减小;含侧氨基聚硅氧烷能有效增韧环氧树脂,而且SAPS粘度越大,被改性的环氧基体的抗冲击强度就越高.A series of polysiloxane with side amino (SAPS) and various viscosities were synthesized.Epoxy resin was modified with SAPS and a series of samples were prepared.They were characterized by using dynamic mechanical thermal analysis(DMTA)、tensile and impact、contact angle measurement and SEM techniques.DMTA data illustrates that the T_g of the matrix decreases when it is modified with SAPS.The results show that the compatibilities of SAPS and Epoxy are changed with viscosities of SAPS.When the viscosities of SAPS are moderate,they are more compatible with epoxy.The results of mechanical test and measurement show that SAPS can elasticize epoxy resin,and impact strength can be largely improved.SAPS of larger viscosities can elasticize epoxy better.The larger the viscosities are,the greater the phase separation between the two compositions.In addition,the result of contact angle measurement indicates that the enrichment of polysiloxane on the resin surface is not affected with the different viscosities of SAPS

Study of Sea-island Fibers Structure and Their Dyeing Properties

通过色差仪、DSC、结晶速度测量、显微图像分析以及动态机械热分析研究了四种海岛纤维的结晶度、结晶速度、晶粒大小、玻璃化温度与染色性能的关系.结果表明:结晶度小,结晶速度慢,晶粒尺寸大,玻璃化温度低等等均有利于纤维染色性能的提高.Dyeing is one of the biggest problems of sea-island fibers.It is well known that dyeing quality of industrial poly ethylene terephthalate(PET) yarns can be greatly influenced by the physical and structural properties of the yarns.In order to evaluate the effect of physical and structural properties on dyeing performance of sea-island fibers,this article dealt with four commercially available sea-island super micro fibers,whose main component were PET and the specifications were 105/48*37i,105/48*25i,105/36*37i,and 105/36*37i~*;their chromatic differences were characterized and compared using a color difference meter;and subsequently the different physical and structural factors that may affect the dyeing performance,such as the glass-transition temperature,the degree of crystallinity,the crystallization rate,and the grain size of these fibers,were investigated.The relationship between dyeing performance and these factors was studied.Differential scanning calorimetry(DSC) revealed that low degree of crystallinity exerted favorable influence on dyeing.Crystallization detector suggested that dyeing quality was improved as crystallization rate decreased.When these fibers were observed under polarizing microscope,it showed that good dyeing quality was related to big grain size.The results of the dynamic mechanical thermo analysis(DMTA) showed that fibers with low glass-transition temperature tended to yield good dyeing quality because of the molecular motion

Replication of superhydrophobic surfaces of polymer from abrasive papers

Abrasive papers are well-known tool for polishing solid surface with different roughnesses. Here we present a facile method for making superhydrophobic surface using the metallographic abrasive papers as the mold. The rough surfaces of polymers including polydimethylsiloxane, polyethylene, polypropylene, and polystyrene were prepared with casting or hot embossing on the abrasive paper molds. SEM results reveal that the roughness of the polymer surface could be controlled by selecting the mold. Contact angle. measurement shows that the water contact angle(WCA) on the as-prepared surfaces increased with the increase of roughness of the abrasive papers used, especially, the WCA on the surfaces prepared with types of W7, W5 abrasive papers can reach more than 150 degrees, alias superhydrophobic surface. The replicas show that the changing from Wenzel state to Cassie state indicated the roughness changing. And the difference of WCA on rough surface between polymers with different intrinsic contact angles is decreased while Wenzel state changes to Cassie state

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies