Effect of Linker Structure on Salicylic Acid-Derived Poly(anhydride−esters)
摘要:
A series of salicylic acid-derived poly(anhydride -esters) were synthesized by melt polymerization methods, in which the structures of the molecule ("linker") linking together the two salicylic acids were varied. To determine the relationship between the linker and the physical properties of the corresponding poly(anhydride-ester), several linkers were evaluated including linear aliphatic, aromatic, and aliphatic branched structures. For the linear aliphatic linkers, higher molecular weights were obtained with longer linear alkyl chains. The most sterically hindered linkers yielded lower molecular weight polymers. The thermal decomposition temperature increased with the alkyl chain length, but the glass transition temperature decreased, due to the enhanced flexibility of the polymer. The highest glass transition temperatures were obtained by using aromatic linkers as a result of inereased pi-pi interactions. Water contact angles determined the relative hydrophobicity of the polymers, which correlated to hydrolytic degradation rates; i.e., the highest contact angle values yielded the slowest degrading polymers.
Effect of Linker Structure on Salicylic Acid-Derived Poly(anhydride−esters)
摘要:
A series of salicylic acid-derived poly(anhydride -esters) were synthesized by melt polymerization methods, in which the structures of the molecule ("linker") linking together the two salicylic acids were varied. To determine the relationship between the linker and the physical properties of the corresponding poly(anhydride-ester), several linkers were evaluated including linear aliphatic, aromatic, and aliphatic branched structures. For the linear aliphatic linkers, higher molecular weights were obtained with longer linear alkyl chains. The most sterically hindered linkers yielded lower molecular weight polymers. The thermal decomposition temperature increased with the alkyl chain length, but the glass transition temperature decreased, due to the enhanced flexibility of the polymer. The highest glass transition temperatures were obtained by using aromatic linkers as a result of inereased pi-pi interactions. Water contact angles determined the relative hydrophobicity of the polymers, which correlated to hydrolytic degradation rates; i.e., the highest contact angle values yielded the slowest degrading polymers.
Stretched film structure of the poly-1,3-phenylene terephthalate type
申请人:MITSUI PETROCHEMICAL INDUSTRIES, LTD.
公开号:EP0052927A2
公开(公告)日:1982-06-02
A monoaxially or biaxially stretched film structure, or a heat-set structure thereof, of an unstretched film of an aromatic polyester having an intrinsic viscosity, determined in p-chlorophenol at 50°C, of 0.4 to 2.0 and composed of [A] polybasic carboxylic acid component units consisting of terephthalic acid units (a1) and units (a2) of a polybasic carboxylic acid otherthan terephthalic acid, the proportion of the units (a2) being up to 25 mole% based on the units (a,) and units (a2) combined, and [B] polyol component units consisting of resorcinol units (b1) and units (b2) of a polyol other than resorcinol, the proportion of the units (b2) being up to 25 mole% based on the units (b1) and (b2) combined.
The invention relates to the use of di-aspirin (bis(2-carboxyphenyl)succinate) and its derivatives in the treatment of colon and colorectal cancer. It also relates to novel derivatives of di-aspirin and to a method of synthesis of the di-aspirin and its derivatives.
US9351980B2
申请人:——
公开号:US9351980B2
公开(公告)日:2016-05-31
[EN] DI-ASPIRIN DERIVATIVES<br/>[FR] DÉRIVÉS DE DIASPIRINE
申请人:UNIV WOLVERHAMPTON
公开号:WO2011098839A2
公开(公告)日:2011-08-18
The invention relates to the use of di-aspirin (bis(2-carboxyphenyl)succinate) and its derivatives in the treatment of colon and colorectal cancer. It also relates to novel derivatives of di-aspirin and to a method of synthesis of the di-aspirin and its derivatives.