Epoxy Molecular Structure Alteration in Graphene …
471
this work, we studied the products which gave the double-peaked thermal desorption
curves (TDCs).
Table 1 contains the list of such products of the neat resin along with the values
of T max and I max obtained for both low temperature (LT) and main peaks from the
correspondent TDCs.
An additional (wide, low temperature, LT) peak appears at T < 300 °C and is much
softer than the main one for most of the moieties, except hydroxyl groups (m/z =
17) and water molecules (18). The small LT peaks indicate that some portions of
correspondent moieties are weakly coupled with their molecular environment. It may
be suggested that such moieties are constituent of EMCs located in loosely packed
areas.
Loading-induced evolution of TDCs for some individual double-peaked moieties
(m/z = 7, 18, 28, 31, 43, 56) described in Table 1, and is shown in Fig. 7a–f. One can
see that introducing MLGNPs into the epoxy results in suppression of LT-peaks for
most fragments. The suppression evidences binding moieties to the nanoplatelets.
Suppression of the LT-peak for hydroxyl groups (see Fig. 7a) testifies that their
contribution into the effect of simultaneous increasing ε 1γ and ε 2γ is insignificant.
Table 1 The most intensive volatile products of the neat resin along with temperature positions
(T max ) and intensities (I max = I(T max )) of LT- and main peaks
m/z
Chemical formulae Definition
T max1
I max1
T max2
I max2
14
CH 2
Methylene
242
59.2
330
293.7
15
CH 3
Methyl
242
1013.1
330
4041.6
16
CH 4
Primary amine
220
1163.8
330
3513.9
17
OH
Hydroxyl, ammonia
220
2560.1
308
4415.7
18
H 2 O
Water
110
4979.8
330
4659.5
28
CO
Carbon monoxide
244
1307.2
332
4540.2
30
OCH 2
Formaldehyde
244
1031.4
332
3044.3
31
NH 2 CH 3 ,CH 2 OH
Methylamine
332
894.8
40
CHCH 2 CH, COC
–
–
333
2407.8
41
CHCH 2 CH 2 ,
COCH
245
146.1
333
1109.6
42
H 2 CCO
245
89.9
333
3474.1
43
CH 2 NHCH 2 ,
H 3 CCHNH,
H 2 CCHNH 2
Aziridine,
Vynilamine,
Ethanamine
245
573.0
311
3543.95
56
H 2 COCH
Epoxy group
225
17.3
335
811.4
57
CH 2 OCHCH 2 ,
(CH 2 ) 2 CHNH 2
225
27
335
386.2
58
CH 2 OCHCH 3
225
74.9
335
574.5
59
CH 3 (CH 2 ) 2 NH 2 ,
CH 3 CHOHCH 2
225
43.1
313
225.7
471
this work, we studied the products which gave the double-peaked thermal desorption
curves (TDCs).
Table 1 contains the list of such products of the neat resin along with the values
of T max and I max obtained for both low temperature (LT) and main peaks from the
correspondent TDCs.
An additional (wide, low temperature, LT) peak appears at T < 300 °C and is much
softer than the main one for most of the moieties, except hydroxyl groups (m/z =
17) and water molecules (18). The small LT peaks indicate that some portions of
correspondent moieties are weakly coupled with their molecular environment. It may
be suggested that such moieties are constituent of EMCs located in loosely packed
areas.
Loading-induced evolution of TDCs for some individual double-peaked moieties
(m/z = 7, 18, 28, 31, 43, 56) described in Table 1, and is shown in Fig. 7a–f. One can
see that introducing MLGNPs into the epoxy results in suppression of LT-peaks for
most fragments. The suppression evidences binding moieties to the nanoplatelets.
Suppression of the LT-peak for hydroxyl groups (see Fig. 7a) testifies that their
contribution into the effect of simultaneous increasing ε 1γ and ε 2γ is insignificant.
Table 1 The most intensive volatile products of the neat resin along with temperature positions
(T max ) and intensities (I max = I(T max )) of LT- and main peaks
m/z
Chemical formulae Definition
T max1
I max1
T max2
I max2
14
CH 2
Methylene
242
59.2
330
293.7
15
CH 3
Methyl
242
1013.1
330
4041.6
16
CH 4
Primary amine
220
1163.8
330
3513.9
17
OH
Hydroxyl, ammonia
220
2560.1
308
4415.7
18
H 2 O
Water
110
4979.8
330
4659.5
28
CO
Carbon monoxide
244
1307.2
332
4540.2
30
OCH 2
Formaldehyde
244
1031.4
332
3044.3
31
NH 2 CH 3 ,CH 2 OH
Methylamine
332
894.8
40
CHCH 2 CH, COC
–
–
333
2407.8
41
CHCH 2 CH 2 ,
COCH
245
146.1
333
1109.6
42
H 2 CCO
245
89.9
333
3474.1
43
CH 2 NHCH 2 ,
H 3 CCHNH,
H 2 CCHNH 2
Aziridine,
Vynilamine,
Ethanamine
245
573.0
311
3543.95
56
H 2 COCH
Epoxy group
225
17.3
335
811.4
57
CH 2 OCHCH 2 ,
(CH 2 ) 2 CHNH 2
225
27
335
386.2
58
CH 2 OCHCH 3
225
74.9
335
574.5
59
CH 3 (CH 2 ) 2 NH 2 ,
CH 3 CHOHCH 2
225
43.1
313
225.7