Effect of hydrogen bonding strength on the morphology and polymorphism of poly(butylene adipate)
Effect of hydrogen bonding strength on the morphology and polymorphism of poly(butylene adipate)
复制标题
氢键强度对聚己二酸丁二醇酯形貌和多晶型的影响
DOI：
10.1002/pcr2.10108
复制
发表时间：
2020
影响因子：
1.9
通讯作者：
Shouke Yan
中科院分区：
文献类型：
--
作者：
Li Li;Qigu Huang;Huihui Li;Xiaoli Sun;Shouke Yan
研究了聚己二酸丁二醇酯(PBA)及其与聚乙烯酚(PVPh)或酚氧基共混物的形态和晶型。结果表明，PBA/PVPh的氢键强度高于PBA/苯氧基。PBA/苯氧基的环带结构消失，表明环带结构的形成不能直接与氢键强度相关。对于PBA的多态，与纯净的PBA相比，苯氧基不影响多态选择。α/β共混物的结晶温度范围略有变窄。多晶型的晶化温度范围与环带结构的形成不一致。因此，PBA的环带球晶不能与α和β晶体的共存相关联。相反，β到α的转变温度受苯氧基和PVPh掺杂的影响。加入苯氧基后，β-α转变温度略有升高，但加入PVPh后，转变温度明显升高。这归因于β-PBA在与无定形聚合物共混时形成较厚的片层，从而提高了熔点。因此，与纯β相比，共混物中原始α-PBA的熔融和伴随的再结晶发生在更高的温度。
The morphology and polymorphism of poly(butylene adipate) (PBA) and its blend with poly(vinyl phenol) (PVPh) or phenoxy are studied. It is identified that the hydrogen bond strength of PBA/PVPh is higher than that of PBA/phenoxy. The ring‐banded structure disappears for PBA/phenoxy, which shows that the formation of a ring‐banded structure cannot directly correlate to the hydrogen bond strength. For the polymorphism of PBA, phenoxy does not influence of the polymorph selection compared to the neat PBA. The crystallization temperature range for the coexistence of α and β crystals of PBA/PVPh is slightly narrowed. The crystallization temperature range for the polymorphism is not consistent with the formation of the ring‐banded structure. Consequently, the ring‐banded spherulites of PBA cannot be correlated to the coexistence of α and β crystals. By contrast, the β‐to‐α transition temperature is affected by the incorporation of phenoxy and PVPh. The β‐to‐α transition temperature increases slightly as blending with phenoxy but significantly as blending with PVPh. This is attributed to the enhanced melting point of β‐PBA due to the formation of thicker lamellae when blending with the amorphous polymer. Thus, the melting of the original β‐PBA and accompanied recrystallization α‐PBA take place at a higher temperature in the blends than that in neat PBA.