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Enhancement of Tg of Poly(l‐lactide) by Incorporation of Biobased Mandelic‐Acid‐Derived Phenyl Groups by Polymerization and Polymer Blending
Macromolecular Chemistry and Physics ( IF 2.5 ) Pub Date : 2019-12-18 , DOI: 10.1002/macp.201900392 Satoshi Otsugu 1 , Yoshiharu Kimura 1 , Hajime Nakajima 2 , Katja Loos 2
Macromolecular Chemistry and Physics ( IF 2.5 ) Pub Date : 2019-12-18 , DOI: 10.1002/macp.201900392 Satoshi Otsugu 1 , Yoshiharu Kimura 1 , Hajime Nakajima 2 , Katja Loos 2
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A high‐molecular‐weight polyester of poly(mandelate‐co‐lactate) (PML) is prepared by ring‐opening polymerization of stereo‐configuration controlled cyclic diester monomers of methyl‐6‐phenyl‐1,4‐dioxane‐2,5‐dione (MPDD) and lactide. The attained PML shows excellent glassy properties, although the original stereo‐configuration of MPDD is not preserved. The intrinsic high glass transition temperature (Tg) of PML is promising, and it is able to be further enhanced by thermal treatment to as high as 90 °C. Interestingly, the enhanced high Tg is attained by only 15 mol% of mandelate content in the polymer chain which is far lower than the ones suggested by theoretical calculation. The enhancement in Tg is also attained by polymer blending of PML and poly(l‐lactide) (PLLA). The Tg of the polymer blend also reaches 90 °C which is almost 20 °C higher than the ones suggested by theoretical calculations. These results indicate that the rigid mandelate unit consisting of phenyl groups in PML chain effectively interact with PLLA chains in amorphous domain to restrict their chain mobility. The thermal and glassy properties are sufficient to explore new applications in engineering fields.
中文翻译：
通过聚合和聚合物共混掺入生物基扁桃酸衍生的苯基增强聚乳酸的Tg
聚的高分子量聚酯（mandelate-共-乳酸）（PML）是由立体构型的开环聚合制备的控制甲基-6-苯基-1,4-二恶烷-2,5-环二酯单体-二酮（MPDD）和丙交酯。尽管未保留MPDD的原始立体构型，但获得的PML表现出优异的玻璃化性质。PML固有的高玻璃化转变温度（T g）是有希望的，并且可以通过热处理进一步提高到高达90°C。有趣的是，仅通过聚合物链中扁桃酸盐含量的15 mol％即可达到提高的高T g值，远低于理论计算所建议的值。T g的提高也可以通过PML和聚l-丙交酯（PLLA）的聚合物共混来获得。聚合物共混物的T g也达到90°C，比理论计算所建议的温度高出近20°C。这些结果表明，由PML链中的苯基组成的刚性扁桃酸酯单元与非晶域中的PLLA链有效地相互作用，从而限制了其链的移动性。热和玻璃性质足以探索工程领域的新应用。
更新日期：2019-12-18
中文翻译：
通过聚合和聚合物共混掺入生物基扁桃酸衍生的苯基增强聚乳酸的Tg
聚的高分子量聚酯（mandelate-共-乳酸）（PML）是由立体构型的开环聚合制备的控制甲基-6-苯基-1,4-二恶烷-2,5-环二酯单体-二酮（MPDD）和丙交酯。尽管未保留MPDD的原始立体构型，但获得的PML表现出优异的玻璃化性质。PML固有的高玻璃化转变温度（T g）是有希望的，并且可以通过热处理进一步提高到高达90°C。有趣的是，仅通过聚合物链中扁桃酸盐含量的15 mol％即可达到提高的高T g值，远低于理论计算所建议的值。T g的提高也可以通过PML和聚l-丙交酯（PLLA）的聚合物共混来获得。聚合物共混物的T g也达到90°C，比理论计算所建议的温度高出近20°C。这些结果表明，由PML链中的苯基组成的刚性扁桃酸酯单元与非晶域中的PLLA链有效地相互作用，从而限制了其链的移动性。热和玻璃性质足以探索工程领域的新应用。
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