Characterization and modification of commercial acrylic fibers grafted with acrylic acid

The graft copolymerization of acrylic acid (AA) onto commercial acrylic fibers (PAN) has been studied using Azobis(isobutyro)nitrile (AIBN) as an initiator. AA grafting initiated by radicals formed from thermal decomposition of AIBN. In this study, the effects of monomer and initiator concentration, time and temperature reaction on the grafting yield have been investigated. The optimum conditions for this grafting reaction were obtained with an AA concentration of 1.67 M, an AIBN concentration of 0.0097 M, a reaction temperature of T=85 °C and with reaction time of 60 minutes. The fiber structure has been investigated by different experimental techniques of characterization such as Fourier transform infrared spectroscopy (FT‐IR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), water absorption and also in this study has been investigated the mechanical property. The thermal analysis data showed that increasing in grafting yield, decreases the thermal stability of fiber. Grafting also affected slightly the fiber morphology. The experimental data of mechanical properties show clearly that by increasing of grafting yield, max extension will decrease. Grafting of poly AA improved water absorption.     

Automotive waterborne surfacer with improved stone-chip resistance

A new type of water dispersible hybrid polymer has been developed comprising a mercapto functionalized poly(epoxy ester) core, onto which the shell, an acrylic chain, has been grafted. Synthesis and characterization of such a hybrid polymer are given in full detail. When applied to automotive primer/surfacer formulations, they exhibit high solids contents, good filling power, and good stone-chip resistance, both in the VDA and SAE tests as well as with a controlled acceleration stone thrower (CAST).     

丙烯酸酯干式复合胶粘剂研制及应用

本文研究了丙烯酸酯干式复合AD胶粘剂的性能和单体组成,丙烯酸酯共聚物的合成工艺以及AD胶粘剂的成份之间的关系。结果表明,AD胶粘剂的性能达到常用聚氨酯干式复合胶粘剂的水平,某些性能优于它,而AD胶粘剂的成本却降低了20％～30％。     

J—634室温快速固化胶粘剂

J—634室温快速固化胶粘剂系非计量混合二液型胶粘剂。由主剂和活化剂两组份组成。其采用了齐聚物及固体促进剂,降低了胶粘剂的毒性和臭味。该胶具有室温快速固化,贮存稳定性极好,填隙能力强等特点,而且性能优于第二代丙烯酸酯,适用于流水作业线上应用。     

来自大不列颠的礼物2010上海世博会英国馆设计

英国是世界上第一个工业化国家,历来以技术先进以及科技的领先著称。整个设计的基本概念是：作为＂礼物＂的主展馆放置在刚刚被打开的＂包装纸＂里面。作为礼物,不仅仅是展馆,还是一座可以随着黄浦江吹来的微风徐徐摆动的＂活＂的建筑。     

多元共聚高吸油树脂合成及性能研究

以(甲基)丙烯酸酯类、苯乙烯为主要共聚单体,双甲基丙烯酸乙二醇酯(EGDMA)、二乙烯基苯(DVB)等为交联剂,采用悬浮共聚工艺合成了一系列高吸油树脂.研究了树脂共聚单体组成、丙烯酸单体链长、交联剂种类、交联度、引发剂量以及聚合工艺等因素对吸油树脂吸油量等性能的影响.结果表明:采用EGDMA交联时以丙烯酸十四酯的效果最佳,采用DVB交联时以丙烯酸十二酯效果最佳;交联剂种类及交联度大小对树脂吸油性能及树脂形态有明显影响;树脂交联度的大小明显影响树脂共聚物的转化率与可溶性分率,也明显影响树脂产品的收率.在最佳合成条件下制备的高吸油树脂具有较佳的吸油性能,对甲苯的吸附量可达17.32 g/g树脂.     

振动条件下建筑外露超长柔性杆的防水施工技术及措施

世博会英国馆主展馆是由一个木结构梁及胶合板组成的夹心承重结构和亚克力杆及铝管组成的装饰杆单元,组合杆件单元全部从结构内部穿出,外露长度4.6～6m不等,其中有防水要求的杆件数量多达30000根,并长期处在振动工况中,防水处理难度很大.在考虑防水措施时充分考虑了外界的环境条件,经过多次尝试和测试,并结合严格的现场管理,使...     

电子束辐照交联PVC/EVA共混物的研究

以丙烯酸酯类多官能团不饱和单体为交联敏化剂,采用电子束对聚氯乙烯(PVC)与乙烯—酸酸乙烯共聚物(EVA)的共混物进行辐照交联。研究了VA质量分数、交联敏化剂种类及用量、辐照剂量、EVA用量对共混物凝胶质量分数、力学性能以及热延伸性能的影响。结果表明：EVA共聚物能促进PVC的辐照交联,增加共混体系的凝胶质量分数,改善其力学及热延伸性能;EVA共聚物中VA质量分数增大,共混体系的凝胶质量分数增大,力学及热延伸性能改善更明显。     

膦基丙烯酸-马来酸酐共聚物阻垢剂ZPS-01的合成及阻垢性能

合成了膦基丙烯酸－马来酸共聚物阻垢剂ＺＰＳ－０１。最佳工艺条件为：ＡＡ、ＭＡ摩尔比７５：２５，次磷酸盐２０％，引发剂１０％，反应时间４ｈ，反应温度９０℃，静态阻垢性能测试结果表明，ＺＰＳ－０１用作油田污水的阻垢剂，综合性能优于常用阻垢剂ＨＥＤＰ。