Curing reaction kinetics of epoxy/glass fiber prepregs for compression molding

doi:10.19491/j.issn.1001-9278.2021.12.014

Abstract

Abstract:

The curing reaction process of epoxy/glass fiber prepregs for compression molding was studied using a dynamic DSC method. The curing kinetic parameters of the prepregs were obtained using the Kissinger′s and Crane′s methods， and the phenomenological curing kinetic model was established. The gelation time of the prepregs were obtained using a free rotor vulcanizer at different temperatures. The functional relationship between the curing temperature and gelation time was calculated through a linear fitting method， and the curing process of the prepregs was optimized. The results indicated that the apparent activation energy， pre?exponential factor， and the reaction order of the prepregs were calculated to be 89.9 kJ/mol， 1.17×10¹¹ and 0.93， respectively， through the Kissinger and Crane methods. The epoxy resin exhibited a certain mobility when the molding temperature and preheating time were set as 150 ℃ and 40 s， respective. The composites presented optimal comprehensive properties after holding 300 s at a molding pressure of 2 MPa.

Key words: epoxy, glass fiber, prepreg, curing kinetics, compression molding process, composite

CLC Number:

TQ323.5

PENG Xinlong, ZENG Yuqing, LIANG Zhuoen, XIE Yi. Curing reaction kinetics of epoxy/glass fiber prepregs for compression molding[J]. China Plastics, 2021, 35(12): 81-87.

Figures/Tables 15

Fig.1. DSC curves of the PCM prepregs at different heating rates

β/℃·min^-1	T_i/℃	T_p/℃	T_f/℃	$?$ H/J·g^-1
5	117.7	133.6	175.6	89.2
10	125.2	143.5	183.5	99.2
15	132.2	150.1	191.5	97.7
20	136.7	154.1	199.7	94.9

β/℃·min^-1	T_i/℃	T_p/℃	T_f/℃	$?$ H/J·g^-1
5	117.7	133.6	175.6	89.2
10	125.2	143.5	183.5	99.2
15	132.2	150.1	191.5	97.7
20	136.7	154.1	199.7	94.9

Tab.1. Dynamic DSC parameters of the PCM prepregs

Fig.2. Curves of the curing degree?temperature

Fig.3. Relationship between reaction rates and curing degree under non?isothermal conditions

Fig.4. Linear fit curve from Kissinger method

Fig.5. Linear fit curve from Crane method

Fig.6. Relationship between curing degree and time at different curing temperatures

Fig.7. Relationship between curing temperature and curing time at different curing degree

固化温度/℃	时间/min
固化温度/℃	α=0.9	α=0.95	α=0.99
110	36.3	46.3	62.2
120	17.2	215.0	32.1
130	9.0	11.4	16.4
140	4.5	6.1	8.5
150	2.6	3.3	5.0

Tab.2. Time required to reach a specific curing degree of the prepreg at different temperatures

固化温度/℃	凝胶时间/min
110	7.8
120	3.6
130	2.1
140	1.0
150	0.6

Tab.3. Gelation time of the prepreg at different curing temperature

Fig.8. Fitting curve of gelation time and temperature of the PCM prepreg

Fig.9. Gelation curve of the PCM prepreg

水平	预热时间（A）/s	固化时间（B）/s	固化压力（C）/MPa
1	20	180	2
2	30	300	3
3	40	420	4

Tab.4. Orthogonal experiment for the PCM prepreg

试验号	溢胶量/%	拉伸强度/MPa	拉伸模量/GPa	弯曲强度/MPa	弯曲模量/MPa	T_g/℃
A₁B₁C₁	14.0	414.2	20.0	493.5	25.7	115.4
A₁B₂C₂	15.7	490.6	22.7	564.2	32.7	124.6
A₁B₃C₃	18.1	538.6	28.6	768.7	35.9	130.8
A₂B₁C₂	11.2	501.8	26.8	698.3	32.8	111.5
A₂B₂C₃	9.3	455.0	22.8	618.9	29.4	108.4
A₂B₃C₁	10.6	504.5	25.6	479.4	30.4	113.7
A₃B₁C₃	8.5	528.7	28.9	725.5	29.4	113.7
A₃B₂C₁	4.5	541.9	28.4	772.6	30.3	125.6
A₃B₃C₂	6.2	498.6	27.7	738.9	32.6	138.6

Tab.5. The test data of the composite?laminates

Fig.10. Pressure and curing degree curves of the prepreg under given compression molding progress

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