Meanwhile, these results indicate that carboxylic acid groups were formed on the opened MWNTs, and the weight percentage of the hexamethylene diamine grafted on the MWNTs was approximately 2 wt% of the total weight.
After grafting with hexamethylene diamine, the MWNTs could take part in the curing process of epoxy resin.
Several were opened at both ends, some were filled with Ag, and others were grafted with hexamethylene diamine.
Dimethylterephthalate was reacted with hexamethylene diamine in a glass reactor equipped with a stirrer, a reflux condenser, a temperature controller, and a thermometer.
The polycondensation of hexamethylene diamine and a mixture of terephthalic and isophthalic acid (T:I = 7:3) to the polyphthalamide PA6T6I (poly[imino-(l,4-co-l, 3-dioxophenylene)-iminohexamethylenel]) was studied.
BMe was amidated with hexylamine (A) and hexamethylene diamine (DA).
m] = 265[degrees]C was used, and hexamethylene diamine (Aldrich) and trimethylhexamethylene diamine (2,2,4- and 2,4,4-trimethyl mixed in the ratio 2:3, hub-Chemie).
The reactions in the model system BEt-DA of ethylbenzoate and hexamethylene diamine were carried out, measured, and interpreted as in Part I.
Finally, hexamethylene diamine was replaced to avoid problems with the high crystallinity of the product PA6T (which melts at 370[degrees]C and tends to crystallize from solutions).
The products generated during this process include hexamethylene diamine (HMD), 5-cyanovaleramide (CVAM), adiponitrile (ADN), caprolactam (CL), 6-aminocaproamide (6-ACAM) and 6-aminocapronitrile (6-ACN).
In a process developed by Moran for DuPont , such catalysts are used for the depolymerization of polyamide mixtures, and efficiently produce caprolactam from nylon 6 and hexamethylene diamine from nylon 6,6.
To carry out continuous reaction on long fibers, the fibers were immersed first in the adipoyl chloride solution for 30 min and then passed successively through solutions containing hexamethylene diamine
and adipoyl chloride in a continuous reaction lab set-up which is schematized in Fig.