Further insight on amine-metal reaction in epoxy systems
نویسندگان
چکیده
Among thermosetting polymers, epoxy resins are major components of adhesives, sealants, paints and composites. Polymerization is often achieved by reaction monomers like DGEBA with amine hardeners such as DETA. Previous works showed that polyamines interact metal (hydr/oxide) substrates leading to the formation an interphase involving chelation surface ions. In this work, we further explored interaction between DETA aluminum (hydr)oxide, denoted Al, via a combined experimental modeling approach. We inspected in depth DSC modifications glass transition temperature Tg change heat capacity ΔCp after curing, allowing us quantifying impact Al amount on DGEBA/DETA degree cure α. A new parameter, “percentage inhibition cure” α¯, was defined reaching up ~4 % our conditions. parallel, situ mixing calorimetry confirmed exothermic character various degrees division. DFT calculations were carried out examine DETA/Al3+ chelates. plausible chelate configurations, one associated lower conformational energy shorted Al-N bond lengths, suggesting greater stability. Calculated Raman spectra additionally investigated, discuss about chelates at play.
منابع مشابه
Interfacial kinetics of a model epoxy-amine addition reaction.
The kinetics of the addition reaction at a solid interface for a model epoxy-amine system composed of monofunctionalized phenyl glycidyl ether and hexylamine was examined. The chemical character for the reaction of this system at the interface was the same as that in the bulk, while the physical nature was significantly different. Slowing down of the diffusion for the reactants in close proximi...
متن کاملwind farm impact on generation adequacy in power systems
در سال های اخیر به دلیل افزایش دمای متوسط کره زمین، بشر به دنبال روش های جایگزین برای تامین توان الکتریکی مورد نیاز خود بوده و همچنین در اکثر نقاط جهان سوزاندن سوخت های فسیلی در نیروگاه های حرارتی به عنوان مهم ترین روش تولید توان الکتریکی مطرح بوده است. به دلیل توجه به مسایل زیست محیطی، استفاده از منابع انرژی تجدید پذیر در سال های اخیر شدت یافته است. نیروگاه های بادی به عنوان یک منبع تولید توان...
15 صفحه اولFurther Observations on Blocking Zeros in Linear Muitivariabie systems (RESEARCH NOTE).
While attempting to clarify the confusion concerning the conceptualization of "blocking zeros" in state space in the recent literature, some new observations are made on the relationship between pole-zero cancellation and transmission blocking. An important distinction between uncontrollable and unobservable eigenvalue s is pointed out; and it is argued that the description of a Blocking Zero, ...
متن کاملSelf-healing thermoset using encapsulated epoxy-amine healing chemistry
Self-healing was achieved with a dual-microcapsule epoxy-amine chemistry in thermoset epoxy. One capsule contained a modified aliphatic polyamine (EPIKURE 3274) while the second capsule contained a diluted epoxy monomer (EPON 815C). Amine microcapsules were prepared by vacuum infiltration of EPIKURE 3274 into hollow polymeric microcapsules. Epoxy microcapsules were prepared by an in situ polyme...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Surfaces and Interfaces
سال: 2021
ISSN: ['2468-0230']
DOI: https://doi.org/10.1016/j.surfin.2021.100959