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Composites: Mechanics, Computations, Applications: An International Journal
ESCI SJR: 0.354 SNIP: 0.655 CiteScore™: 1.2

ISSN Druckformat: 2152-2057
ISSN Online: 2152-2073

Composites: Mechanics, Computations, Applications: An International Journal

DOI: 10.1615/CompMechComputApplIntJ.2020031230
pages 77-98

PROCESSES OF DYNAMIC THERMAL DESTRUCTION OF COMPOSITE EPOXY MATERIALS AS A FUNCTION OF 3,3-DICHLORO-44-DIAMINODIPHENYLMETHANE CONTENT

A. V. Buketov
Kherson State Maritime Academy, 20 Ushakov Ave., Kherson, 73009, Ukraine
Viacheslav G. Kulinich
Kherson State Maritime Academy, 20 Ushakov Ave., Kherson, 73009, Ukraine
S. A. Smetankin
Kherson State Maritime Academy, 20 Ushakov Ave., Kherson, 73009, Ukraine
V. M. Yatsyuk
Scientific-Research Criminalistic Center of the Ministry of Internal Affairs of Ukraine, 48 Stepan Budnyi Str., Ternopil Region, Ternopil, 46000, Ukraine
Serhii V. Yakushchenko
Kherson State Maritime Academy, 20 Ushakov Ave., Kherson, 73009, Ukraine

ABSTRAKT

The research of modifier 3,3-dichloro-4,4-diaminodiphenylmethane (MBOCA) exposure on thermophysical characteristics of composite materials is carried out. In order to analyze the composites' response to the effect of thermal field, the thermal coefficient of linear expansion (CTE) has been calculated. Thermogravimetric (TGA) and differential thermal (DTA) analyses were carried out in order to study thermal destruction and structure formation processes. Maximum temperature values of exothermic effect were found to be dependent on the composite material applied. Shrinkage of the modified matrix, glass transition temperature, and Martens yield temperature were studied. In addition, the polymer fracture topology was analyzed by the optical microscopy.
According to the results of DTA and TGA measurements, the optimal temperature ranges for epoxy composites with MBOCA modifier content q = 0.10 wt.% were established. The material with a maximum value of destruction completion temperature T0 = 640.5 K was formed. The minimum value was T0 = 537 K, the difference between minimum and maximum values was ΔT0 = 103 K. This difference indicates substantial effect of modifiers on the initial value of destruction temperature. Exothermic effects were found during the influence of the composite thermal field in the temperature range ΔT from 456 to 770 K. The value of maximum temperature Tmax of exo-effects in a composite with MBOCA modifier content q = 0.50-2.00 wt.%, compared to an unmodified matrix (Tmax = 618 K), lie within the range from 619 to 696 K. The difference between minimum and maximum values composes ΔT = 78 K, which is a validation of substantial positive matrix structure alteration after the modifier admission into the ED-20 epoxy oligomer matrix.

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