微胶囊技术的研究

通过聚合物交联，成功地制得适应于无碳复写纸的微胶囊，方法简便，原料易得，成本低。     

Alternariol,a dibenzopyrone mycotoxin ofAlternaria spp., is a new photosensitizing and DNA cross-linking agent

Summary The mycotoxin alternariol (3,4,5-trihydroxy-6-methyldibenzo [a] pyrone) but not alternariol monomethyl ether (3,4-dihydroxy-5-methoxy-6-methyldibenzo [a] pyrone) is phototoxic toEscherichia coli in the presence of near UV light (320–400 nm). The phototoxicity bioassays with a DNA repair-deficient mutant ofE. coli suggested that DNA may be the molecular target for photo-induced toxicity of alternariol. Interactions between alternariol and double-stranded, supercoiled DNA suggest that alternariol interacts with DNA by intercalation. No DNA breakage was detected in this system; however, alternariol forms a complex and cross-links double-stranded DNA in near UV light. These results suggest that alternariol is a new phototoxic, DNA-intercalating agent and is a DNA cross-linking mycotoxin in near UV light.Acknowledgment. Dr Albert Stoessl (Agriculture Canada, London, Ontario, Canada) generously provided a mixture of alternariol and alternariol monomethyl ether, and made many helpful suggestions. Dr Ashwood-Smith (University of Victoria, Victoria, British Columbia, Canada) kindly supplied the microorganisms through Dr G.H.N. Towers (University of British Columbia, Vancouver). We gratefully acknowledge the gifts. It is a pleasure to acknowledge the able assistance of Mr S. Tallevi.     

PH值对水胶炸药的交联时间及热稳定性影响研究

本文介绍了利用正交试验法研究水胶炸药交联时间及热稳定性的影响程度的方法。结果显示，除了交联剂含量，胶粘剂含量，水合时间等因素外，PH值是影响水胶炸药交联时间及热稳定性的重要因素。本文从化学反应的角度论述了PH伍影响该体系的作用。     

现代生物技术应用于抗衰老研究的新进展

论述了生物体衰老的分子机理，探讨了抗衰老的途径，归纳了将现代生物技术应用于抗衰老研究的新进展。     

聚氨酯粉末涂料的制备与固化条件的研究

运用正交试验法研究了制备聚氨酯粉末涂料的工艺条件，讨论了树脂、固化剂、固化 催化剂等对涂膜性能的影响；并对涂料的固化条件进行了研究，得到了理想的固化温度和固化 时间．     

化学交联型体温形状记忆聚氨酯研究

Ｓｈａｐｅｍｅｍｏｒｙｐｏｌｙｕｒｅｔｈａｎｅ (ＳＭＰＵ)ｉｓａｎｏｖｅｌｆｕｎｃｔｉｏｎａｌｐｏｌｙｍｅｒｍａｔｅｒｉａｌ.Ｉｎｒｅｃｅｎｔｒｅ ｓｅａｒｃｈ ,ｂｏｄｙｔｅｍｐｅｒａｔｕｒｅＳＭＰＵｉｓｒｅｃｅｉｖｉｎｇｍｏｒｅａｎｄｍｏｒｅｓｐｅｃｉａｌｉｎｔｅｒｅｓｔｉｎｇ .Ｂｏｄｙｔｅｍｐｅｒａ ｔｕｒｅＳＭＰＵｂｅｌｏｎｇｓｔｏｓｅｇｍｅｎｔｅｄｃｏｐｏｌｙｍｅｒ ,ｗｈｉｃｈｃａｎｂｅｄｅｆｏｒｍｅｄｉｎｔｏａｎｙｆｒｅｅｓｈａｐｅａｂｏｖｅｔｈｅｇｌａｓｓｔｒａｎｓｉｔｉｏｎｔｅｍｐｅｒ…     

Preparation and Characterization of Temperature-Sensitive Hydrogels Composites by Coating Method

In this study,the hydrogels composites with coatings based on a temperature-sensitive linear copolymer of N-tert-butylacrylamide(NTBA)and acrylamide(AAm)on cotton fabrics have been developed.The cotton fabrics were coated using aqueous solution of the linear copolymer,1,2,3,4-butanetertracarboxylic acid(BTCA)as a cross-linker and sodium hypophosphite(SHP)as a catalyst,followed by drying and curing.The effects of cross-linking reaction conditions in coating process on water-impermeable ability of coated cott...     

应用交联剂TAHT提高活性染料固色率的探讨

本文探讨了交联剂TAHT在活性染料印花时的作用。证实了在活性染料印花中采用交联剂TAHT,可使大部分常用活性染料的固色率及印花织物的K/S值获得不同程度的提高,并确定了应用TAHT的合适的色浆配方及印花工艺。使用TAHT可提高活性染料的利用率,减轻后处理负担,减少污水,降低成本。     

稳定剪切条件下聚合物冻胶的交联动力学研究

采用HAAKE RS150流变仪,测试分析了稳定剪切条件(1～20 s-1)下部分水解聚丙烯酰胺与铬离子的交联过程中表观粘度随时间的变化规律,得到稳定剪切条件下的交联动力学方程.研究结果表明,稳定剪切下成冻体系的交联反应可分为诱导、成冻、限制粒径和稳定4个阶段,当剪切速率增大或聚合物、交联剂浓度降低时,可能不出现明显的粒径限制阶段;初始交联时间与剪切速率、部分水解聚丙烯酰胺中的羧基浓度、铬离子浓度、氢离子浓度有关;稳定剪切下交联反应的表观活化能为60.56 kJ·mol-1.与静态条件下的交联反应相比,稳定剪切条件下交联反应速率受聚合物中羧基的影响更大,交联反应表观活化能降低.     

胶原支架材料的制备与表征

分别采用真空高温脱水和化学交联剂1-乙基-3-(3-二甲基氨基丙基)-碳化二亚胺处理经冷冻干燥后的胶原海绵材料,制备组织工程支架,讨论反应条件对胶原性能的影响,测定胶原支架的力学强度和降解特性.结果发现,不同的处理方法都能保持胶原海绵的三维多孔结构,孔隙率可达到90%;真空高温脱水获得的胶原海绵材料力学强度较小,但断裂伸长率略大;碳化二亚胺交联胶原海绵材料力学强度相对较高,抗张强度为380 kPa左右.胶原海绵交联后,降解速率显著小于未经交联的胶原材料.细胞培养试验表明成纤维细胞可以在支架材料上正常生长.两种交联方法处理胶原海绵,其细胞生长行为差异无显著性,适合于作为组织工程支架.