Finishing of Polyester Fabrics with Cyclodextrins and Polycarboxylic Acids as Crosslinking Agents

CDs were grafted onto PET fibers by the intermediate of polycarboxylic acids thatplayed the role of crosslinking agents. We evidenced that grafting occurred despitethat no reaction could happen between the polycarboxylic acids and PET. It wasconcluded that the mode of grafting occurred through the formation of a crosslinkedcopolymer between PCA and CDs. This copolymer was not covalently fixed to thefibers, but physically adhered or was entangled into the fibrous network so that grafting was resistant to washings and was permanent. We report that the grafting rate depended on (i) temperature of curing; (ii) time of curing; (iii) the ratio PCA/CD. In the most drastic conditions, the weight increase of the fabrics due to the graft reaction could reach 25–30%-wt. , , -CDs and HP--CD successfully reacted but not RAMEB because of its reduced number of free hydroxyl groups available for the esterification reaction.     

5-Hexylidene-4-propylamino-1,5-dihydroimidazol-2-one formed from Cu-catalyzed oxidation with implication for the structure of a His-Lys cross-link

Cu-catalyzed oxidation of 5-hexyl-1,3-dihydroimidazo-2-one(1)in the presence of propylamine,as surrogates for the oxidized His side chain and Lys side chain,was investigated.5-Hexylidene-4-propylamino-1,5-dihydroimidazol-2-one(2),a model His-Lys cross-link product,was isolated and structurally characterized by NMR and mass spectrometry.     

铝阳极氧化着色封闭膜的电子显微分析

本文对铝合金阳极氧化电解着色及封闭膜的分区结构、氧化膜定向生长和封闭结构进行了扫描电镜显微分析和透射电子显微分析。其分析结果对铝合金精饰工艺研究具有较好的指导作用。     

基于双磨头的磁流变抛光机床与工艺研究

针对传统单磨头磁流变抛光技术的不足,提出了一种新的双磨头磁流变抛光方法,并研制了一台八轴数控双磨头磁流变抛光机,具备了大口径平面、非球面及连续位相板的超精密、高效率加工能力。分别研究了大、小磨头材料去除特性及面形修正能力,不仅获得了稳定、有效的大、小抛光斑,而且获得了超精的大、小平面工艺样件。50 mm小平面经小磨头一次连续抛光,在 45 mm内其面形精度PV由0.21 收敛至0.08 、RMS由0.053 收敛至0.015 ;430 mm430 mm大平面经大磨头3次迭代抛光,在410 mm410 mm内其面形精度PV由0.4 收敛至0.1 、RMS由0.068 收敛至0.013 。由此表明,所研制的双磨头磁流变抛光机床具有较好的材料去除特性和较强的面形修形能力。     

球形磁铁在弯管内表面磁力研磨中的应用

空间弯管内表面微裂纹用传统的研磨方法难以去除.利用六自由度机械手结合磁力研磨加工装置实现空间弯管内表面研磨加工.为了提高磁力研磨弯管内表面的加工效率,根据研磨工艺数学模型分析得到提高研磨压力是提高研磨效率的有效手段.因此,提出在研磨介质中添加球形磁铁作为辅助抛光工具提高研磨介质对弯管内表面的压力.通过Ansoft Maxwell软件分析得到添加球形磁铁后加工区域的磁感应强度增大,即研磨压力变大.并对TB8合金弯管进行研磨试验,试验结果表明添加球形磁铁后研磨加工效率提高约40%;表面粗糙度降至0.09 μm左右,并通过电子显微镜观察到内表面上的微裂纹已去除.实验验证了球形磁铁辅助研磨弯管内表面的可行性,为提高磁力研磨加工效率提供了一种新方法.     

金属光学零件的精密加工

简单地介绍了金属光学零件的特点及其车削加工的原理。以具体实例说明了金属光学零件的精密加工过程,同时介绍了金属光学零件的测量方法。     

Influence of antimicrobial finishes on the biodeterioration of cotton and cotton/polyester fabrics: Leaching versus bio-barrier formation

The influence of antimicrobial activity of two contemporary finishes, specifically a dispersion of colloidal silver (Ag) and 3-(trimethoxysilyl)-propyldimethyloctadecyl ammonium chloride (Si-QAC), on the degree of biodeterioration of 100% cotton (CO) fabric and fabric composed of a mixture of cotton and polyester (CO/PET) was studied. Ag was chosen for the leaching agent, while Si-QAC was used as the bio-barrier-forming agent. The biodeterioration of samples finished with different concentrations of Ag and Si-QAC was analysed from a standard soil burial test after 3, 6 and 12 days of exposure to soil microflora. SEM micrographs revealed intensive biodeterioration of the unfinished cellulose fibres, while the highly biologically resistant polyester fibres remained undamaged. A controlled release of Ag successfully inhibited biodeterioration of the cellulose fibres in the CO and CO/PET fabrics when its concentration reached a lethal, biocidal concentration. Contrary to the effects of Ag, the bio-barrier formation of Si-QAC on CO and CO/PET fabrics was insufficient to protect the cellulose fibres during longer periods of soil burial, irrespective of its concentration. Intensive chemical changes to the cellulose were clearly seen from the FT-IR spectra of all of the samples. The resistance of the polyester component to biodeterioration did not provide any significant protection for the cotton component in CO/PET fabric.     

Poly-dimethylsiloxane derivates side chains effect on syntan functionalized Polyamide fabric

Poly-dimethylsiloxane (PDMS) polymers finishing of Polyamide-6,6 (PA66) fabrics involves ionic interactions between reactive groups on the PDMS polymers and the ones of the textile fabric. Such interactions could be strengthened by a pretreatment with a fixing agent to promote either ion-ion and H-bonding and ion-dipole forces. These forces could contribute towards the building of substantial PDMS-PA66 systems and the achieving of better adhesion properties to fabrics. Four different silicone polymers based on PDMS were applied on a synthetic tanning agent (syntan) finished Polyamide-6,6 fabric under acid conditions. Soxhlet extraction method and ATR FT-IR technique were used to investigate the application conditions. The finishing parameters such as pH and temperature together with fastness, mechanical and performance properties of the treated samples were studied and related to PDMS side chains effect on syntan functionalized Polyamide fabric.     

一次性唾液α-淀粉酶生物传感器的研制

基于丝网印刷技术在PVC薄膜上制备了一次性碳电极,用Nafion固定二茂铁(Fc)作为电子介体,将α-糖苷酶和葡萄糖氧化酶(GOD)滴加于二茂铁修饰的电极上,滴加明胶晾干,戊二醛间接交联固定制成一次性唾液α-淀粉酶生物传感器,用计时电流法测定对α-淀粉酶的响应.实验结果表明,该传感器响应电流与α-淀粉酶活性在60～840 U/L之间呈现良好的线性关系,检出限为17 U/L.该生物传感器响应时间短,达到95%稳态响应时间不超过30 s,具有良好的一致性、准确性和稳定性.探讨了pH、缓冲液、温度及其它干扰物质等对该传感器的影响.该传感器可用于唾液α-淀粉酶浓度的快速、准确检测.