全氢聚硅氮烷(PHPS)涂层材料研究进展

全氢聚硅氮烷(PHPS)在一定条件下可转化为二氧化硅,是一种良好的涂层材料。文章综述了PHPS作为涂层材料的优势和固化机理,并重点介绍了其在相关领域的应用,最后指出了该材料目前在国内发展需要解决的问题。     

全氢聚硅氮烷涂层制备及其性能

以重复单元为-(SiH_2NH)-的全氢聚硅氮烷(PHPS)前驱体溶液为原料,采用水汽固化方式制备新型低表面能防护涂层。通过接触角测试、硬度及附着力等力学性能试验研究了PHPS固化过程中温度与时间对涂层性能的影响。使用傅里叶红外光谱仪(FTIR)与扫描电镜(SEM)对PHPS涂层化学结构以及微观形貌进行表征观察,并通过动电位极化曲线研究了最佳工艺制备的涂层的耐蚀性能。研究表明,温度200℃、时间2 h为PHPS水汽固化的最佳工艺参数。在温度200℃、时间2 h固化制备的PHPS涂层表面平整致密,无明显缺陷且与基体结合良好,PHPS涂层接触角最大为105°,计算得出其表面自由能为18.74 mN·m~(-1),涂层硬度达到9 H,附着力等级达到0级。由动电位极化曲线可知,浸泡48 h后涂层的电流密度为2.136×10~(-7)A·cm~(-2),基体的电流密度为1.336×10~(-4)A·cm~(-2),腐蚀电流密度大大降低,涂层保护效率高达99.84%。     

含氟聚硅氮烷的制备及其性能研究

聚甲基氢硅氮烷(简称PMSZ)是一类典型的有机聚硅氮烷(OPSZ)。通过硅氢加成反应在PMSZ的硅氢键上引入全氟烯烃,合成了一种新型的氟代有机硅材料,该含氟聚硅氮烷具有优异的附着力和较低的表面能特性,可以将其作为功能涂料有效改善底材的防污易清洁特性。在此基础上,系统考察了含氟聚硅氮烷在硬度、抗开裂、耐磨等机械性能上的表现,阐明了不同含氟量聚硅氮烷对涂层性能的影响,很好地解决了以往有机硅和有机氟树脂在防污易清洁涂层构建上的缺陷。     

聚硅氮烷的应用研究进展

在简要介绍聚硅氮烷发展历程的基础上,综述了聚硅氮烷的应用研究进展,主要包括纤维、涂层、块体、多孔陶瓷、微电子机械系统(MEMS)等应用形式,并结合本课题组在聚硅氮烷方面的研究成果展望了聚硅氮烷的发展前景。     

聚硅氮烷纤维电子束辐射交联的研究（Ⅰ）聚硅氮烷纤维的辐射交联

研究了聚硅氮烷纤维（ＰＳＺ）氮气氛条件下的电子束辐射交联不熔化处理,分析了该纤维在辐照过程中的结构变化。结果表明：聚硅氮烷纤维可以实现不溶化,辐照过程中发现了Ｓｉ－Ｈ,Ｎ－Ｈ间的自由基的交联反应,形成了Ｓｉ－Ｎ－Ｓｉ的桥连结构。     

陶瓷前驱体聚硅氮烷的应用研究进展(一)

综述了陶瓷前驱体聚硅氮烷在制备陶瓷涂层、陶瓷纤维、纳米材料、磁性陶瓷上的应用研究进展,指出了应用研究前景。     

聚甲基硅氮烷作耐热材料的研究

和甲基氯硅烷高沸物为原料,在甲苯中与氨反应,生成聚硅氮烷。在氮气保护下,以１２００℃将聚硅氮烷进行热裂解,生成以Ｓｉ３Ｎ４为主的原料。它在９５０℃热重分析失重０．０５％,呈现很好的耐热性能,并用ＩＲ、ＵＶ和＾１Ｈ－ＮＭＲ对它作了分析。     

聚硅氮烷防护涂层材料的研究进展

聚硅氮烷作为新型的防护涂层材料,既可通过适当方式转化为陶瓷涂层,用于高温防护,又可直接用作有机涂层材料,实现防腐防污等功能,具有薄层致密、功能多样、工艺灵活、与各类基材结合良好等优势,近年来逐渐成为研究的热点.本文简要概述了聚硅氮烷材料在防护涂层领域的应用概况,总结了其作为防护涂料的性能特点和防护机制,简述了国内外聚硅...     

含乙烯基聚硅氮烷的裂解过程分析

采用红外、色质联用、热重分析、元素分析等手段对含乙烯基硅氮烷的裂解过程进行研究，发现裂解主要发生在473－673K和673－1023K两个阶段。在第一阶段，NH3的生成缘于转氨基作用，H2的生成可能是Si－H键间（或与N－H键）偶合的结果；在第二个阶段，H2、CH4和低分子烷烃的生成则遵循自由基反应机理。硅氢化或亚甲基插入反应导致高温裂解产物中含有大量富余碳。     

聚硅氮烷的制备及其在涂料中的应用实例

简述了聚硅氮烷的制备方法及其在涂料中的应用实例,指出聚硅氮烷在涂料工业中的应用必将为涂料工业新材料和新产品增色生辉。     

HVM膜在盐水精制中的应用试验及工业化

介绍了HVM膜在盐水精制中的应用及工业化情况，实验结果表明HVM膜过滤质量高、速度快、能力大、膜强度大、使用寿命长，保证和提高了一次盐水的质量。     

两化融合技术在橡胶轮胎行业的应用实践

"两化融合"意为"信息化"对于"工业化"质的提升。我国橡胶轮胎行业的信息化建设有待进一步完善。说明在信息化的带动下橡胶行业未来几年的发展趋势是数字化、节能化、集成化、智能化、网络化。并以软控公司、赛轮股份公司为例,说明两化融合模式对企业发展的作用。     

Transparency and water vapor barrier properties of polybenzoxazine‐silica nanocomposites provided with perhydropolysilazane

Poly[6,6′‐(1‐methylethylidene)bis(3,4‐dihydro‐3‐2H‐1,3‐hexylbenzoxazine)] (PB‐hda)‐silica nanocomposites were synthesized with perhydropolysilazane (PHPS) and PB‐hda by ring opening polymerization in one step. Both high transparency and good water vapor barrier property (WVP) are required to be improved in the field of packing and electronic materials, such as OLED, solar cell, and electronic paper. PB‐hda has shown high toughness and high thermal stability. However, it became dark brown and showed a reduction of WVP with increasing curing temperature, which make it difficult to be applied to packing and electronic materials. In this study, we aim to improve transparency and WVP by addition of PHPS into PB‐hda matrix. It was found that nanocomposites showed the improvement of WVP and transparency owing to Si? O? C linkages between PB‐hda and PHPS. In particular, a nanocomposite with 1 wt % of silica showed the most significant improvement in terms of transparency and the WVP. These properties were found to be influenced by the thickness of the combined polymer‐silica layers that formed around the silica particles; these layers were thickest in the 1 wt % sample. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 44238.     

黄霉素工业化发酵过程中灰色预测模型的应用

将灰色预测模型应用于黄霉素工业化发酵过程中。对采用Streptomyces bambergiensis 在60 m3发酵罐中批式补料发酵生产黄霉素的过程分别建立GM（1,8）、GM（1,1）和灰色Verhulst模型。3种模型的预测模拟结果表明都可以模拟黄霉素工业化发酵过程,其平均相对误差分别为15.322%、6.093%和1.776%,残差平方和分别为4.177 g2/L2、0.680 g2/L2和0.053 g2/L2。通过比较3种模型预测模拟结果证明灰色Verhulst模型更适合黄霉素工业化发酵过程的预测模拟。     

生物乙烯开发进展与产业化

介绍了发展生物乙烯的必要性和重要意义,着重阐述了生物乙烯产业化进程中的低成本非粮乙醇生产、高性能乙醇脱水催化剂及反应器设计、工艺过程节能设计等关键技术研究进展,并指出生物乙烯作为绿色可持续发展产业已充分显示了强大生命力.     

Water vapor barrier property of organic-silica nanocomposite derived from perhydropolysilazane on polyvinyl alcohol substrate

Poly(vinyl alcohol) membrane was coated with organic-silica nanocomposite derived from perhydropolysilazane. For organic composite part, polystyrene-block-poly(4-vinyl phenol) [SP], poly(tert-butyl acrylate-co-2-hydroxyethyl methacrylate) [BA] and poly(butyl methacrylate-co-2-hydroxyethyl methacrylate) [BMA] were used. Water vapor barrier property of coat membrane was measured at relative humidity = 96% by a cup method. The coat films of nanocomposites with SP-silica and BA-silica showed better water vapor barrier property than those of the silica coat film without organic polymer and BMA-silica composites. The surface morphologies of the coat films were investigated by scanning electron microscopy and atomic force microscopy. The addition of organic polymer to silica prevented the crack formation of coat layer on the substrate.     

Polymer derived ceramic materials from Si,B and MoSiB filler-loaded perhydropolysilazane precursor for oxidation protection

Silica-based coating systems were developed using polymer derived ceramics (PDCs) technology. Ceramic composites on the base of a SiO₂ and SiNO matrix and homogeneously distributed Mo₅SiB₂, SiB₆, Si and B fillers were manufactured. The coating systems have low porosity and provide a high oxidation resistance up to 100 h at 800 °C and 1100 °C in air. The influence of temperature and atmosphere of pyrolysis on the polymer precursor, the volume fraction of filler materials on the chemical composition of compacts as well as their high-temperature oxidation protection was investigated.     

生物可降解塑料聚乙醇酸的合成及其工业化研究进展

综述了近年来国内外生物可降解塑料聚乙醇酸(PGA)的合成及改性方法,以及工业化生产技术.将催化剂种类、聚合方法和反应条件作为切入点,对PGA结构和物理性能影响规律进行总结分析.在此基础上,结合我国当前能源结构,展望了我国自主研发的煤制合成气路线制备PGA的工业化进展和前景.     

二苯甲酰基甲烷的工业化设计及生产

在小试实验的基础上,对二苯甲酰基甲烷(DBM)进行了工业化设计及试生产,并从关键技术、工艺流程及“三废”治理等方面对DBM工业化设计及工艺操作的可行性进行了评价。生产结果表明,该设计工艺流程简单,工艺操作稳定、安全,“三废”治理有效,产品收率高、质量好．适合工业化大生产。     

Surface hardness and transparency of poly(methyl methacrylate)‐silica coat film derived from perhydropolysilazane

To prepare hard and transparent poly (methyl methacrylate)‐silica coat film on glass or polycarbonate substrates, poly(methyl methacrylate‐co‐2‐hydroxyethyl methacrylate) random copolymers and perhydropolysilazane (PHPS) were blended in solution. Then the solution was cast on the substrates. The grafting of PHPS onto 2‐hydroxyethyl methacrylate unit was analyzed by ¹H NMR spectroscopy. Surface hardness and transparency of the coat film were measured by nano‐indentation method and UV‐Vis spectroscopy, respectively. Surface hardness of coat film depended on the volume fraction of silica in the coat film, and reached 2.7 GPa when the volume fraction of silica was 76.4%. Transparency of the coat films prepared with PHPS was almost 100%, indicating that the coat film prepared with PHPS was highly transparent not only on glass substrate but also on the polycarbonate substrate. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007