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Confined PEO crystallisation in immiscible PEO/PLLA blends

机译：狭窄的PEO / PLLA共混物中的PEO结晶

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The thermal and morphological properties of PEO/PLLA blends have been widely studied, and the kinetics of PLLA crystallisation have been very well described. However, their miscibility is still a subject of controversy and PEO crystallisation behaviour in these blends is not completely understood. In this paper, the miscibility of PEO/PLLA blends was studied over a wide molar range (5 to 163 kDa and 11 to 199 kDa, for PEO and PLLA, respectively). DSC, DMA, and POM results indicate that PEO/PLLA blends are immiscible over the entire composition range of the molar masses studied. Moreover, the PLLA content of the blends crystallises under cooling at a constant rate from melting to form a continuous crystalline phase, such as a crystal network, even for blends with low PLLA content. Therefore, the PEO phase is confined in the interlamellae and interspherulite regions and a confined and fractional type of crystallisation occurs as the density of the PLLA crystalline phase increases (with increasing PLLA content in the blends). XRD and SAXS data showed that both PLLA and PEO influence each other's crystallisation. While the presence of PEO induces PLLA crystallisation in the α-form, PLLA acts as a template for PEO crystallisation.
机译：PEO / PLLA共混物的热量和形态学性质已被广泛研究，PLLA结晶的动力学已经非常良好地描述。然而，它们的混溶性仍然是争议的主题，并且这些混合物中的PEO结晶行为并不完全理解。在本文中，在宽摩尔范围（分别为PEO和PLLA的宽摩尔范围（5至163kDa和11至199kDa）上研究了PEO / PLLA混合物的混溶性。 DSC，DMA和POM结果表明，在研究的摩尔质量的整个组成范围内不混溶PEO / PLLA混合物。此外，对于熔化以恒定速率，混合物在冷却下结晶的PLLA含量以形成连续结晶相，例如晶体网络，即使对于具有低PLLA含量的共混物。因此，将PEO相限制在层间，并且当PLLA结晶相的密度增加（随着共混物中的增加含量增加PLLA含量时，发生狭窄和分数的结晶型。 XRD和SAXS数据显示PLLA和PEO均彼此影响彼此的结晶。虽然PEO的存在诱导α-形式的PLLA结晶，PLLA用作PEO结晶的模板。

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