838. Acetals and oligoacetals. Part I. Preparation and properties of reactive oligoformals
作者:R. F. Webb、A. J. Duke、L. S. A. Smith
DOI:10.1039/jr9620004307
日期:——
SYNTHESIS OF AND COMPOSITIONS CONTAINING DIAMINOACETALS AND DIAMINOKETALS
申请人:Pastine Stefan J.
公开号:US20150152043A1
公开(公告)日:2015-06-04
The present invention relates to the reduction of polycyano compounds to produce polyamines, in particular diaminoacetal and diaminoketal compounds, and their use as curing agents in epoxy resin compositions. The reduction with molecular hydrogen can be carried out using a metal catalyst selected from GROUP VIII and a catalytic promoter. The reduction can include anhydrous or aqueous ammonia. The reaction can be carried out in continuous and batch modes with catalyst and solvent recycling. The epoxy resin composition consisting of an epoxy resin and a polyamine curing agent that can be used in fiber-reinforced composite materials, coating materials, and the like.
US8785694B2
申请人:——
公开号:US8785694B2
公开(公告)日:2014-07-22
Substituent Effects on the pH Sensitivity of Acetals and Ketals and Their Correlation with Encapsulation Stability in Polymeric Nanogels
作者:Bin Liu、S. Thayumanavan
DOI:10.1021/jacs.6b11181
日期:2017.2.15
that the ρ value for the hydrolysis of benzylideneacetals is about -4.06, which is comparable to an SN1-like process. This shows that there is a strong, developing positive charge at the benzylic position in the transition state during the degradation of acetals. This positively charged transition state is consistent with the relative degradation rates of acetals vs ketals (correlated to stabilities
Synthesis and structure-property relationship of epoxy vitrimers containing different acetal structures
作者:Innocent Toendepi、Siyao Zhu、Yinqiao Liu、Liying Zhang、Yi Wei、Wanshuang Liu
DOI:10.1016/j.polymer.2023.125862
日期:2023.4
three acetal bonds provide evidence about relationship between the dynamic behaviors of cured epoxy resins and acetal structures. The mechanical and thermal characteristics of all the original and reprocessed cured epoxy resins were investigated and compared. Finally, the chemical resistance of cured epoxy resins prepared by three ACAs was evaluated in various acid solutions. We believe the findings in