MODIFIER FOR AROMATIC POLYESTER AND AROMATIC POLYESTER RESIN COMPOSITION COMPRISING THE SAME
申请人:TABATA Masayoshi
公开号:US20110224343A1
公开(公告)日:2011-09-15
The present invention provides a modifier for aromatic polyesters which enhances the melt fluidity of aromatic polyesters without a significant decrease in the heat resistance of the aromatic polyesters, and an aromatic polyester resin composition including the modifier for aromatic polyesters. The present invention relates to a modifier for aromatic polyesters comprising polyhydric phenol residues and residues of aromatic polycarboxylic acid, acid halide or acid anhydride thereof, and the modifier comprises a material having a structure composed of a first residue selected from the group consisting of divalent residues represented by Formula (I): —Ar—W
1
x
—Ar— and by Formula (II): —Ar—, the first residues being bonded to two identical or different second residues selected from the group consisting of monovalent residues represented by Formula (III):
and monovalent residues represented by Formula (IV): —O—C(O)—R
7
—.
Programmable Nuclear-Spin Dynamics in Ti(IV) Coordination Complexes
作者:Spencer H. Johnson、Cassidy E. Jackson、Joseph M. Zadrozny
DOI:10.1021/acs.inorgchem.0c00244
日期:2020.6.1
ligands and six complexes formed by coordination of the ligands to a Ti(IV) ion. These studies reveal that 1H T1 values can be enhanced in the individual ligands by a factor of 4 (from 10.8(3) to 43(5) s) as a function of substitution pattern, reaching the maximum value for 3,4,6-tribromocatechol. The T2 for 1H is also enhanced by a factor of 4, varying by ∼14 s across the series. When complexed, the impact
核自旋的间隙图案化是一种新兴的设计原理,用于控制开壳络合物和固态缺陷中的电子自旋叠加寿命。本文中,我们报告了构图原理对基于配体的核自旋动力学的影响的首次测试。我们测试了配体上1 H和79/81 Br核自旋的取代构图如何调节金属络合物配体壳中的质子核自旋动力学。为此,我们研究了一系列八种多溴邻苯二酚配体和通过配体与Ti(IV)离子配位形成的六种配合物的1 H核磁共振弛豫时间(T 1和T 2)。这些研究表明1 H T 1值可以在单个配体中提高4倍(从10.8(3)到43(5)s),作为取代模式的函数,达到3,4,6-三溴邻苯二酚的最大值。该Ť 2为1 H也完全是由4倍增强,通过在串联~14小号变化。当复杂化时,图案设计策略对核自旋动力学的影响被放大,并且1 H T 1和T 2值变化一个数量级。重要的是,在配体中观察到的总体趋势也与复合时的趋势相匹配。因此,这些结果证明了一种新的设计原则可以控制
An antimony-121 Mössbauer spectroscopic study of some dihalogeno(halogen-substituted benzene-1,2-diolato)antimonate(<scp>III</scp>) complexes and of some tetrabromoantimonates(<scp>III</scp>)
作者:Mohammed Alamgir、Peter W. C. Barnard、John D. Donaldson
DOI:10.1039/dt9800001542
日期:——
rather than by the total number of bonding interactions formed by the SbIII in the highly distorted environments of the complexes. The larger negative shifts for the SbBr4– complexes compared with SbBr3 is consistent with a decrease in the number of short Sb–Br bonds and hence in the covalent character of the Sb–Br interactions. The shift for the benzenediolatoantimonates(III) is shown to be dominated by
The present invention provides an aromatic polyester which is substantially free from the occurrence of coloration and retains significantly high transparency even after being thermally processed at high temperature and which has high flowability. The aromatic polyester contains a polyhydric phenol residue and a residue of any one of aromatic polycarboxylic acid, halide thereof, and anhydride thereof, and terminals of the aromatic polyester have a structure represented by the formula -C(O)-R. The aromatic polyester has an end-capping rate of 90% or higher and a weight average molecular weight (Mw) ranging from 3,000 to 1,000,000.