Organic–inorganic polymer hybrids prepared by the sol-gel method

This review focuses on some aspects of organic-inorganic hybrid materials prepared by the sol-gel method. This field has been studied worldwide as one of the nanotechnologies, and is now of current interest for both organic and inorganic scientists. The elaboration of organic–inorganic polymer hybrid materials using the sol-gel process can be accomplished by various approaches. The simplest method is increasing the compatibility by using physical interactions, covalent bonding and compatibilizer between organic polymer and silica gel. Other novel approaches, such as an in-situ method, NHSG (Non- Hydrolysis Sol-Gel) process, and use of reactive polymer hybrids resulted in the preparation of novel transparent organic–inorganic polymer hybrid materials. Stimulus responsive polymer hybrids are also mentioned. Furthermore, nano-structured organic–inorganic polymer hybrids are created by using supermolecular and self-assembly of organic molecules or polymers recently. The obtained nano-structured hybrid materials showed unique properties that could not be found in amorphous hybrid materials. The possibilities and applications of organic–inorganic polymer hybrid materials are also described in this review.     

A way of constructing translation network operators by Bernstein operators

In the present paper,we provide a way of constructing translation network operators by Bernstein-Durrmeyer operators.     

用神经网络法鉴别十二碳共轭双烯-1-醇、醛和乙酸酯双键位置异构体

将神经网络运用到十二碳双烯-1-醇、醛、乙酸酯三类化合物及其双键位置异构体的识别预报上,本文报道这一工作的主要结果.     

六次甲基四胺－二羧酸银(Ⅰ)的三维非穿插网状聚合配合物的 合成与结构

报道了四齿配位的六次甲基四胺(hmt)与Ag(Ⅰ)形成的三维非穿插网状结构配合物[Ag2(μ4-hmt)(μ3-oga)]·3H2O(1)和[Ag2(μ4-hmt)(μ3-mpa)]·3H2O(2)(oga=2,2'-氧合二乙酸根,mpa=1,3-苯二甲酸根)的合成与结构,标题配合物都是具有六边形框架的蜂窝状三维非穿插网状结构,而包含在其中的二羧酸根均以单齿-双齿的配位形式出现,配合物1(C10H22Ag2N4O8)属单斜晶系,空间群P21/c,a=0.6366(3)nm,b=1.1736(7)nm,c=2.1998(12)nm,β=97.60(6)°,V=1.629(2)nm^3,Z=4,R1=0.0491,ωR2=0.1231。配合物2(C14H22Ag2N4O7)属单斜晶系,空间群P21/c,a=1.2944(4)nm,b=1.1998(7)nm,c=2.3491(14)nm,β=95.49(4)°,V=3.631(3)nm^3,Z=8,R1=0.0664,ωR2=0.1526.     

具有三维网络的新型配位聚合物[Nd(C7H6NO2)3.H2O]n的合成、结构和性质

以Nd(NO3).6H2O和NH2C6H4COOH为原料,经[Nd(C7H6NO2)3.H2O]的自组装,得到了具有三维网络结构的配位聚合物[Nd(C7H6NO2)3.H2O]n。该聚合物晶体属单斜晶系,空间群P2(1)/n,a=0.98069(5)nm,b=2.2736(2)nm,c=0.98254(8)nm,β=100.053(5)°,V=2.1571(3)nm^3,Z=4。最后的一致性因子R=0.038。磁性研究表明,该化合物在低温下表现出反铁磁性质。测定了化合物的UV-vis-NIR和IR光谱,进行了分析和指认。     

天然植物复杂化学模式特征的分步提取法

在运用神经元计算技术对高维小样本复杂化学模式进行分类时,通过模式特征提取,降低输入变量维数,能使复杂的模式分类问题比较容易解决。根据模式类别相关分步分析思路,提出复杂化学模式特征分步提取法,可将原始模式数据中与类别指标相关较大的特征量有效地提取出来。应用于天然植物组效关系辨识结果表明,这种化学模式特征提取方法比经典主成分分析法更为实用可靠。     

Organized assembly from biosurfactants

The formation of higher order aggregates in aqueous media from naturally occurring surfactants (biosurfactants) and its mechanism have been studied. A liposome (vesicle), as a kind of artificial cell, is prepared according to a newly developed microencapsulation technique from phospholipids by mimicking the molecular structure of biomembranes. Secondly, the surface active properties of alkaline salts of spiculisporic acid depend on the kinds of alkali as its gegen ions; these have been studied for the purpose of a detailed understanding of vesicle formation of the alkylamine salts of spiculisporic acid in the binary system consisting of spiculisporates and water. Thirdly, the solution behavior of the ternary system of spiculisporates-oil-water is examined. Divalent cationic salts of spiculisporic acid formed oil-in-water (O/W) emulsion gels due to ionic-bonding network formation of spiculisporates around emulsified oil droplets and these are important for their gelling properties. These gelling systems may have potential to be O/W emulsion-type paints and safe fuels.     

Synthesis of Novel Double Network Hydrogels via Atom Transfer Radical Polymerization

Novel double network (DN) hydrogels were prepared via atom transfer radical polymerization (ATRP) of the first network using two different initiators, and followed by ultraviolet (UV) photo-initiated polymerization for the second network. The first networks of DN hydrogels were prepared by using two different initiators; one is a one-side initiator, and the other is a double-side initiator. The mechanical properties of various DN gels, such as water content and compressive strength, were studied. The network structure of the DN hydrogels was also characterized by dynamic light scattering. Thus, we demonstrated that the ATRP method is useful to control the network structure of the first network for DN gels. Extensive inhomogeneous structure of the first network was obtained by ATRP method and increased both the swelling degree and softness of DN gels.     

二维聚硫杂酞菁铜的合成与性质

以四氰基-1,4-二噻英为原料,分别用无溶剂法和溶剂法合成了平面稠合型网状聚硫杂酞菁铜PCuS~8Pc(A)和(B),经元素分析,热谱,IR, 电子吸收与发射光谱表征.PCuS~8Pc具有光敏性和本征半导体性能,σ~2~9~8~K(A):2.29×10^-^6Ω^-^1 ·cm^-^1,(B):5.83×10^-^6Ω^-^1·cm^-^1