A series of novel amino-alcohol curing agents for PU adhesives were synthesized from CO 2 , glycidyl ether and diamine through carbonation and amination reactions. By physically evaluating the compounds through FT-IR and 1 H NMR spectroscopy and mechanically analyzing the adhesives through T-peel strength tests, the raw materials have successfully been transformed into curing agents and the curing agents were found to endow the adhesives with specific structures and unique properties. For PVC bonding, compared to the traditional curing agents HDA and HDO, the T-peel strength and medium resistance from the novel amino-alcohol compounds improved. Further analysis revealed distinction in mechanical properties for different curing agents, the trifunctional curing agent exhibited the largest tensile strength and hardness. Moreover, thermal analysis of the adhesives demonstrated the considerable thermal stability to those prepared from HDA and HDO.
Jinyi Liu,Haojie Yu,Li Wang,Sergey Z. Vatsadze,Dingning Chen,Xudong Wu,Xiaodan Gong,Yu Wang
As an oxidant, the pyrolysis behavior of ammonium perchlorate is the key to the combustion of composite solid propellants . Seeking a suitable catalyst to promote AP decomposition has drawn much attention. Ferrocene-based compounds are often used as burning rate catalysts because of their excellent catalytic effect. However, ferrocene-based burning rate catalysts are prone to migration during storage of propellants. In this study, six ferrocenyl glycidyl ethers were designed and synthesized to improve the anti-migration properties, and the related spectra characterization techniques were adopted to confirm their molecular structures. Furthermore, their related properties and mechanisms were also studied. As a result, they showed good redox performance, positive promotion on AP decomposition, excellent combustion and mechanical performance. Meanwhile, they had a higher anti-migration behavior compared with catocene and ferrocene. This study demonstrates that ferrocenyl glycidyl ethers have great potential to be applied as multifunctional burning rate catalysts in composite solid propellants.
Designing sustainable epoxy resins with intrinsic recyclability and degradability has become vital in polymer science. Here, we report sulfur chain-modified epoxy networks (SxEyUz) through catalyst-free tri-component polymerization of elemental sulfur with glycidyl ethers of bio-sourced eugenol (EGE) and 10-undecenol (UGE) via inverse vulcanization. The biogenic allyl protons on EGE were disclosed to be critical for the dual-mechanism cross-linking system. Intermediates from the tri-component polymerization were found to be flowable, storable, and post-curable. Reprocessable epoxy polymers with tensile strength up to 13.0 MPa were obtained after curing, surpassing most reported bio-based polymers via inverse vulcanization. Carbon fiber (CF) composites fabricated in the SxEyUz matrix can be readily digested in a methanol solution of Na2S and neat hexylamine to recycle CF.
危险品化学品经营许可证（带存储）