八含量与移植诱导的分子重量偏差之间的相互作用及其对乙烯/1-八改性聚胺6的冲击强度的影响
Abdul Kadir Deeb1,2, Oliver Neuß2, Silke Rathgeber1
1Institute for Integrated Natural Sciences, Physics Department, University of Koblenz, Universitätsstraße 1, 56070 Koblenz, Germany.
Polymers
|March 14, 2026
概括
优化聚胺6冲击修饰需要平衡兼容性和可加工性. 带有特定的八和接种水平的无化接种乙烯/1-八共聚合物 (EOR-g-MAH) 在不同温度下提供了增强的冲击强度.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物化学 聚合物化学
背景情况:
- 聚胺6 (PA6) 冲击修饰面临着平衡兼容性,修饰分子量 (MW) 和融化可加工性的挑战.
- 作为冲击修饰剂,使用有化接种的乙烯/1-奥克共聚合物 (EOR-g-MAH),但它们的性能对接种条件和修饰剂特性敏感.
研究的目的:
- 调查EOR-g-MAH修饰剂中不同氧含量 (coct) 和有机无水合物接种水平 (cMAH) 对PA6的冲击性能和融化可加工性的影响.
- 阐明竞争的接种机制 (β-分裂与交叉链接) 以及它们对修饰器MW分布和粒子强度的影响.
- 为了确定最佳的EOR-g-MAH组合物,在广泛的温度范围内增强冲击强度,而不会损害可加工性.
主要方法:
- 植入EOR与受控的可克特 (13,15,16mol%) 和cMAH (0.5,1.0重量%) 的水平.
- 在固定的组成下将EOR-g-MAH纳入PA6.
- 使用凝透色谱 (GPC) 分析修饰剂MW分布.
- 使用仪器Charpy撞击测试,在广泛的温度范围内评估撞击行为.
主要成果:
- 植入EOR-g-MAH涉及β分裂和交叉链接之间的竞争,显著影响修饰器MW分布和粒子强度.
- 较高的八烯含量 (15-16 mol%) 通过增强弹性和塑性变形,提高了高达~0 °C的冲击性能,但由于化,导致粒子在高温下失去强度.
- 在高cct和cMAH (1.0重量%) 时,增加β-裂变会降低MW,对BDTT (脆性-柔性过渡温度) 以上的冲击性能产生不利影响.
- 在广泛的温度范围内,通过适度的cMAH (0.5 wt%) 和coct (15 mol%) 实现最佳冲击强度,平衡强度和可塑性.
- 这种最佳组合导致中度PA6链,较低的化合物粘度和有利的化可加工性.
结论:
- 在EOR-g-MAH中,八烯含量和接种水平之间的相互作用决定了修饰剂的特性和PA6的影响性能.
- 适度的无酸接种和八烯含量的特定组合为高性能PA6冲击修饰提供了强大的解决方案.
- 这些发现为设计聚胺量身定制的冲击修饰剂提供了一条途径,优化机械性能和可加工性.
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