with theoretical studies and relationship between molecularstructure and mesogenic behavior has been established. The mesomorphic properties of the resultant dimers were characterized by differential scanning calorimetry (DSC) and polarized optical microscopy (POM) equipped with a hot stage. Change in mesomorphic properties with change of methylene spacers was observed. Enantiotropic mesogenic behavior
摘要 已经制备了一个新的同源系列的对称、弯曲形状的双苯甲酰胺二聚体。几个 1,n-双 (对氨基苯氧基) 烷烃 (n = 3, 5, 9,10,11) 被用作间隔物,并且对己氧基尾部已经合成并通过酰胺连接基团附加到间隔物上。使用半经验方法的计算分析探索了不同的重要参数。实验结果与理论研究相关,并建立了分子结构与介晶行为之间的关系。所得二聚体的介晶性质通过差示扫描量热法 (DSC) 和配备热台的偏光显微镜 (POM) 进行表征。观察到介晶性质随着亚甲基间隔基的变化而变化。D 3 A 6 表现出对映性介晶行为,观察到D 10 A 6 和D 11 A 6 以及针状和模糊的纹饰纹理。观察到增加的亚甲基间隔链长度降低了熔融温度。热重分析显示二聚体的热稳定性高达 360 °C。
Thermotropic copolyazomethines and process for preparing them
申请人:ENIRICERCHE S.p.A.
公开号:EP0322943A2
公开(公告)日:1989-07-05
Thermotropic copolyazomethines having a mesophase temperature range lying within a desired range of values are obtained by copolymerizing terephthalic aldehyde with at least two different 1,n-bis(4-aminophenoxy)alkanes.
Such copolya omethines are particularly useful as reinforcing materials for the usual thermoplastic polymers, such as polycarbonate, polybutyleneterephthalate, polyethyleneterephthalate and polyamides.
A novel bisheterocyclic compound represented by general formula (I), which is useful as a hypoglycemic drug, and a novel hypoglycemic drug containing the same, wherein R¹ and R² are the same or different from each other and each represents (a), (b), (c), (d) or (e); R³ represents hydrogen, acetylamino or lower alkyl which may be substituted with carboxyl or sulfoxy; X and Y are the same or different from each other and each represents oxygen, sulfur or NH; B¹ and B² represent a benzene or naphthalene ring which may be substituted with lower alkyl; L¹ and L² are the same or different from each other and each represents a single bond, oxygen, sulfur, sulfinyl or sulfonyl; A represents a single bond, linear or branched alkylene, C₂ to C₆ lower alkenylene or alkynylene; and n is 0 or 1.