使用吸收和荧光技术(稳态和时间分辨)研究了双发色分子端基之间的相互作用。具有三个系列的di-1,n-芳烃基羧基烷烃(芳烃=苯,萘和蒽; n = 1,2,3,5和6)和一系列1-pyrene羧基,n-(N-甲基,N-苯基氨基)烷烃(n= 2、3、4、5、6和9),发现模型化合物(例如苯,萘,蒽和pyr的甲基,乙基和己酯)在吸收和发射光谱,摩尔比和双发色化合物方面有所不同吸收系数和辐射速率常数。这些差异随着端到端距离的六次方的平均值而减小,这归因于端基之间的偶极-偶极相互作用。端基引起最低激发单重态与较高能态的混合,并增加了介质的局部极化率。讨论了两种评估双色化合物非猝灭荧光寿命的方法。
Intramolecular photodimerization of 2-naphthoates: successful application of hydrophobic forces in the preparation of large-ring compounds
作者:Chen-Ho Tung、Yi Li、Zhi-Qiang Yang
DOI:10.1039/ft9949000947
日期:——
observed, suggesting that hydrophobic interactions force polymethylene chains to self-coil. Photoirradiation of these solutions resulted in intramolecular dimerization of 2-naphthoate groups to give ring-closure products. The quantum yields for the photodimerization are significantly greater than those in organic solvents. This work provides an example of the application of hydrophobic interactions in expediting
研究了在水性有机二元混合溶剂中聚亚甲基双(2-萘甲酸酯)(N – M n – N)的荧光光谱和光二聚化。观察到强分子内准分子荧光,表明疏水相互作用迫使聚亚甲基链自成螺旋。这些溶液的光辐照导致2-萘甲酸酯基团的分子内二聚化以产生闭环产物。光二聚化的量子产率显着高于有机溶剂中的量子产率。这项工作提供了疏水相互作用在加速大环实体形成中的应用实例。
Pet Container And Compositions Having Enhanced Mechanical Properties And Gas Barrier Properties
申请人:Kriegel Robert
公开号:US20100143547A1
公开(公告)日:2010-06-10
A container comprising a polyester composition with enhanced mechanical properties is provided. The polyester composition comprises a polyester and a creep control agent. In particular embodiments, the polyester composition comprises a polyester, a creep control agent, and a gas barrier additive. In particular embodiments, the creep control agents are molecules or polymers comprising dianhydrides, bis-lactams, bis-oxazoles, and epoxides.
CONTAINER AND COMPOSITION FOR ENHANCED GAS BARRIER PROPERTIES
申请人:Kriegel Robert
公开号:US20100143546A1
公开(公告)日:2010-06-10
A container comprising a polyester composition with enhanced carbon dioxide and oxygen barrier properties is provided. The polyester composition comprises a polyester and a gas barrier enhancing additive. In a particular embodiment, the gas barrier enhancing additive comprises a compound having the chemical formula:
X—(X
1
)
s
—COO—(X
2
)
t
—X
3
—(X
4
)
u
—OOC—(X
5
)
v
—X
6
or
X—(X
1
)
s
—OOC—(X
2
)
t
—X
3
—(X
4
)
u
—COO—(X
5
)
v
—X
6
Pet Container and Compositions Having Enhanced Mechanical Properties and Gas Barrier Properties
申请人:Kriegel Robert
公开号:US20120121837A1
公开(公告)日:2012-05-17
A container comprising a polyester composition with enhanced mechanical properties is provided. The polyester composition comprises a polyester and a creep control agent. In particular embodiments, the polyester composition comprises a polyester, a creep control agent, and a gas barrier additive. In particular embodiments, the creep control agents are molecules or polymers comprising dianhydrides, bis-lactams, bis-oxazoles, and epoxides.
Pet Container and Compositions Having Enhanced Mechanical Properties and Gas Barrier Properties and Methods
申请人:The Coca-Cola Company
公开号:US20150045482A1
公开(公告)日:2015-02-12
A container comprising a polyester composition with enhanced mechanical properties is provided. The polyester composition comprises a polyester and a creep control agent. In particular embodiments, the polyester composition comprises a polyester, a creep control agent, and a gas barrier enhancing additive. In particular embodiments, the creep control agents are molecules or polymers comprising dianhydrides, bis-lactams, bis-oxazoles, and epoxides.