控制的二氧化碳热聚合,以产生化但可回收的热塑性塑料
Kam C Poon1, Madeleine L Smith1, Charlotte K Williams1
1Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford OX1 3TA, United Kingdom.
Macromolecules
|May 20, 2024
概括
这项研究开发了新的基于二氧化碳的聚合物,可以克服传统聚碳酸的脆性. 这些先进的工程热塑料表现出增强的机械性能和可回收性,提供了一个可持续的替代品.
科学领域:
- 聚合物化学 聚合物化学
- 材料科学 材料科学 材料科学
- 可持续的塑料 可持续的塑料
背景情况:
- 二氧化碳 (CO2) 聚碳酸是有前途的工程热塑性塑料,但由于脆弱性,限制了它们的加工和应用.
- 聚碳酸 (PCHC) 具有很高的抗拉强度,但在断裂时延伸不佳 (<3%).
研究的目的:
- 为了合成明确的,高摩尔质量的CO2聚合物,提高机械性能和可回收性.
- 为了研究将环二碳酸盐链接纳入PCHC的效果.
主要方法:
- 从氧化循环二氧化物 (CHO) 和氧化循环二氧化物 (CPO) 中合成二氧化碳聚合物,使用Zn (II) Mg (II) 催化剂.
- 聚合物结构,分子质量,热稳定性,玻璃过渡温度 (Tg) 和纠分子质量 (Me) 的表征.
- 机械测试 (抗拉强度,性),再加工和化学回收研究.
主要成果:
- 准备了具有高摩尔质量 (86164公斤mol-1) 和良好的热稳定性 (Td>250°C) 的渐变聚合物 (PCHC-grad-PCPC).
- 聚合物表现出高Tg (96108 °C) 和可调的纠分子质量 (423公斤mol-1) 的无形性质.
- 与PCHC相比,一种聚合物 (PCHC0.28-grad-PCPC0.72) 的抗拉强度提高了25%,抗拉度提高了160%.
- 聚合物通过再加工和有效的化学回收回归到单体,证明了出色的可回收性.
结论:
- 聚合物策略有效地提高了易碎的二氧化碳聚碳酸的机械性能.
- 加入少量环二碳酸盐连接可显著改善PCHC特性.
- 这些发现为使用特聚合物设计来坚固易碎的可再生塑料提供了一条途径.
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