专用粉末涂料和涂装发展的新展望

新型专用粉末涂料以其涂膜超薄型化、低温固化和高耐候性等优势,并以预裁割坯料新工艺代替预涂装卷材工艺的新特点,将成为粉末涂料新的增长点。还提出了若干建议和意见。     

石蜡改性热熔胶的研究

本文介绍了一种石蜡改性热熔胶的配方和性能，实验结果表明：用于实型铸造的效果明显地优于现有的几种粘接剂。     

低苯乙烯散发不饱和聚酯树脂研究

用单官能团醇对不饱和聚酯树脂改性，合成了苯乙烯质量分数为30％和W01树脂，对W01树脂的挥发性和反应性进行了测定，研究了成膜助剂对01树脂性能的影响，并与通用型191树脂和一种亚克力板层间粘合用不饱和聚酯树脂进行了比较；指出结合成膜助剂的W01树脂进一步降低苯乙烯的散发。     

Preparation of micron‐size monodispersed PS/P(St/MAA) microspheres by seeded dispersion polymerization

Uniform polystyrene (PSt) particles with the size of 1.9 μm were first prepared via dispersion polymerization, and then used as the seeds in a second‐stage dispersion copolymerization of styrene (St) and methacrylic acid (MAA) to produce carboxyl‐carrying microspheres. The PSt seed particles were swollen by monomer mixture of St and MAA, including an oil‐soluble initiator 2,2′‐azobisiso‐butyronitrile (AIBN), before polymerization. Finally, uniform PS/P(St/MAA) (polydispersity index, PDI = 1.02) microspheres with the size of 2.2 μm were obtained. The average particle size and size distribution of the final microspheres were investigated. MAA contents between 54 and 97 mg/g were detected from the PS/P(St/MAA) particles produced under different conditions. Dispersion medium has great influence on the kinetics of polymerization, due to its effect on the partitioning of monomers, solvents, and initiator in the particle phase, probably as well as on the conformation of the dispersion agent on the surface of the particles. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 99: 3586–3591, 2006     

超支化聚合物在功能材料中的应用

超支化聚合物由于具有高度支化的三维结构以及众多的端基,显示出与相应线型分子截然不同的性质。对超支化聚合物及其在纳米材料、发光材料、特种涂料等功能材料方面的应用做了介绍,显示出其所具有的广阔应用前景。     

反应性乳化剂应用于丙烯酸酯类乳液压敏胶的研制

使用正交试验法设计压敏胶配方,得到用反应性乳化剂参与的AA、HEA、BA和EA、M AA等多元共聚物乳液,研究该聚合物应用于压敏胶的初粘、持粘、剥离强度等力学性能。结果表明,在该体系下引发剂用量、反应温度、AA、反应性乳化剂用量对压敏胶乳液综合性能关系密切,其它各因素影响不明显。得到的优化配方为BA(83%)、AA(1%)、HEA(1%)、MM A和EA的混合单体(15%)。     

Crystallization behavior of carbon nanotubes‐filled polyamide 1010

The nanocomposites of polyamide1010 (PA1010) filled with carbon nanotubes (CNTs) were prepared by melt mixing techniques. The isothermal melt‐crystallization kinetics and nonisothermal crystallization behavior of CNTs/PA1010 nanocomposites were investigated by differential scanning calorimetry. The peak temperature, melting point, half‐time of crystallization, enthalpy of crystallization, etc. were measured. Two stages of crystallization are observed, including primary crystallization and secondary crystallization. The isothermal crystallization was also described according to Avrami's approach. It has been shown that the addition of CNTs causes a remarkable increase in the overall crystallization rate of PA1010 and affects the mechanism of nucleation and growth of PA1010 crystals. The analysis of kinetic data according to nucleation theories shows that the increment in crystallization rate of CNTs/PA1010 composites results from the decrease in lateral surface free energy. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 3794–3800, 2006     

利用金属钠制备甲醇钠的生产工艺

介绍了甲醇钠的合成方法、理化性质以及安全保护应该注意的问题。研究了用金属钠制备液体甲醇钠的生产工艺，建立了生产工艺流程。用该工艺制备的甲醇钠溶液的产率达到98％以上，游离碱含量小于0．5％，产品可满足制药行业的特殊需要，它比传统氢氧化钠制取甲醇钠有明显的技术性能优势。同时也对甲醇钠的测定方法进行了深入研究，建立了一种准确、可靠的分析甲醇钠的方法。     

水中运行设备共振幅频特性研究

在水力机械等淹没水中设备的运行中,常遇到剧烈振动造成设备损坏等故障,多认为由共振引起。本文首先对单自由度简谐振动系统自由振动、强迫振动方程的稳态振动解进行无量纲化处理,计算出不同阻尼比条件下的共振频率比、共振幅值比,发现阻尼比、共振频率比、共振幅值比三者之间存在一一对应的单调变化关系,并据此提出了分别测量设备在水中及空气中的自由振动频率,假定空气中自由振动频率为设备固有频率,再依次确定水中阻尼比和共振幅值比的反求式估算方法。本研究采用敲击法进行了混流式水轮机模型转轮水中及空气中自由振动频率测试,发现其水中自由振动频率比空气中低,其水中一阶自由振动频率与空气中一阶自由振动频率之比约为0.758~0.872;如假定该值为水中自由振动频率比,可计算出相应的水中阻尼比为0.652~0.490,共振幅值比约为1.01~1.17。本研究还进行了中间固定两侧悬臂梁在空气及水中的真实共振试验,在两侧悬臂梁计算固有频率附近均发生明显共振,发现水中共振频率比空气中明显降低,用反求法获得的水中共振幅值比小于2,水中共振幅值对空气中初始振动幅值放大倍数也非常小,进一步说明水中共振时对激振幅值的放大作用非常有限。     

融合交互意图的图神经网络协同过滤算法

传统的协同过滤方法很大程度上以一种统一的方式进行建模,未从交互意图的细粒度上考虑建模关系。为此提出一种融合交互意图的图神经网络协同过滤算法（INTNGCF）。首先,通过将边分解成多个潜在空间来识别潜在意图;其次,利用交互意图融合层确定这些潜在意图的重要性;最后,生成用户对项目的预测评分。在三个真实数据集上与七种基线模型进行对比实验,结果表明,提出的算法与其他先进的推荐模型相比具有一定的性能优势。