We report the synthesis of an ABA triblock copolymer of the structure CTA-b-PB-b-CTA (CTA = cellulose triacetate and PB = polybutadiene) and its ability to compatibilize immiscible CTA/PB polymer blends. CTA-b-PB-b-CTA was synthesized via ring-opening metathesis polymerization of cyclooctadiene (COD) in the presence of CTA containing a single olefin on the reducing end. The ABA triblock copolymer was incorporated into CTA/PB blends, resulting in films that were clear, tough, and creaseable, and increases in modulus, elongation at break, and toughness were observed with addition of as little as 1 wt % compatibilizer. Scanning electron microscopy revealed well-defined PB phases in the CTA matrix that decreased in domain size as more compatibilizer was added. This work may enhance the application scope of CTA and other cellulose-derived renewable polymers.

中文翻译：

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增韧纤维素：增容聚丁二烯和三乙酸纤维素混合物

我们报告了结构为 CTA-b-PB-b-CTA（CTA = 纤维素三乙酸酯和 PB = 聚丁二烯）的 ABA 三嵌段共聚物的合成及其使不混溶的 CTA/PB 聚合物共混物相容的能力。CTA- b -PB- b-CTA 是在 CTA 存在下通过环辛二烯 (COD) 的开环复分解聚合合成的，该 CTA 在还原端含有单一烯烃。将 ABA 三嵌段共聚物掺入 CTA/PB 共混物中，得到透明、坚韧和可折皱的薄膜，并且在添加低至 1 wt% 的相容剂时观察到模量、断裂伸长率和韧性的增加。扫描电子显微镜显示 CTA 基质中明确定义的 PB 相随着添加更多相容剂而减小域尺寸。这项工作可能会扩大 CTA 和其他纤维素衍生的可再生聚合物的应用范围。