Anionic polymerization reaction injection molding process of carbon fiber reinforced nylon 6 composite
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摘要: 以己内酰胺为原料,自制己内酰胺钠(C10)、双酰化内酰胺-1,6-己二胺(C20)分别为引发剂和活化剂,首先对适用于反应注射成型技术(RIM)的尼龙6(PA6)阴离子聚合工艺进行探究。实验结果表明,提高引发剂浓度可提升聚合反应速率,转化率受影响并不明显,但分子量有所降低;而提高活化剂浓度,会导致聚合反应不完全;随着聚合温度的升高,反应速率明显加快,同时分子量增大,结晶度呈下降趋势。最终选取1.5 mol%的C10、1 mol%的C20,浸胶温度100℃、聚合温度180℃的工艺参数,利用自行研制的反应注射设备成功制备了单向碳纤维增强尼龙6 (CF/PA6)复合材料单向板,其沿纤维方向的拉伸强度可达974.2 MPa,弯曲强度达786.9 MPa。Abstract: Caprolactam was used as raw material, sodium caprolactam (C10) and diacyllactam-1,6-hexanediamine (C20) as initiators and activators respectively. The anionic polymerization process of nylon 6 (PA6) suitable for reaction injection molding (RIM) technology was explored. The results show that polymerization rate can be improved by increasing the concentration of C10, but the limiting viscosity number is the opposite. However, increasing the concentration of C20 alone results in incomplete polymerization and low conversion. With the increase of polymerization temperature, the degree of polymerization can be increased. Finally, the unidirectional carbon fiber (CF)/PA6 composites with good properties were prepared by selecting the technological parameters of C10 1.5 mol%, C20 1 mol%, dipping temperature of 100℃ and polymerization temperature of 180℃. The tensile strength along the fiber direction can reach 974.2 MPa, and the bending strength can reach 786.9 MPa.
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Key words:
- nylon 6 /
- anionic polymerization /
- polymerization process /
- reaction injection molding /
- composite
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表 1 聚合实验配方
Table 1. Experimental formula of polymerization
Formulation C10/mol% C20/mol% F1 1 1 F2 1.5 1 F3 2 1 F4 2.5 1 F5 1 1.5 F6 1 2 F7 1 2.5 Notes: C10—Sodium caprolactam; C20—Diacyllactam-1, 6-hexamediamine. 表 2 不同聚合温度下聚合产物PA6结晶数据
Table 2. Crystallization data of polymerization products PA6 at different polymerization temperatures
Polymerization temperature/℃ Crystallization onset temperature/℃ Crystallization termination temperature/℃ Peak temperature/℃ Crystallization enthalpy/(J·g-1) Crystallinity/ % 160 179.4 164.7 171.6 61.69 26.82 170 173.6 160.2 167.9 45.59 19.82 180 180.9 165.2 172.8 48.92 21.27 190 180.9 163.8 172.5 48.69 21.17 表 3 CF/PA6复合材料物理性质与力学性能
Table 3. Physical properties and mechanical properties of CF/PA6 composites
Characterization of CF/PA6 Value Conversion rate/% 96.43 Liminting viscosity number/(mg·L-1) 83.24 Crystallinity/% 24.82 0° tensile strength/MPa 974.2 90° tensile strength/MPa 20.46 0° flexural strength/MPa 786.9 90° flexural strength/MPa 38.55 -
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