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首页> 外文期刊>RSC Advances >Composite banded core and non-banded shell transition patterns in stereocomplexed poly(lactide acid) induced by strongly interacting poly(p-vinyl phenol)
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Composite banded core and non-banded shell transition patterns in stereocomplexed poly(lactide acid) induced by strongly interacting poly(p-vinyl phenol)

机译：强相互作用的聚对乙烯基苯酚引起的立体复合聚丙交酯酸中的复合带状核和非带状壳转变模式

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摘要

Banded cores and non-banded shells with transitional patterns in stereocomplexed poly(lactic acid) sc-PLA (PLLA : PDLA = 1 : 1) interacting with amorphous poly(p-vinyl phenol) (PVPh) (20-30 wt%) were investigated by using polarized optical (POM), atomic force (AFM), and scanning electron microscopy (SEM). The central core of the spherulites is ring-banded, which transitions into non-banded patterns on the outer peripheral in sc-PLA/PVPh blends crystallized at T-c = 160-180 degrees C. This composite crystal morphology is distinctly different from that of the neat sc-PLA, which is a Maltese-cross without any ring patterns in spherulites. The bands in the core region are also dramatically different from those bands with birefringence contrasts observed in classical ring-bands. The bands in the core show only crystal topology and no birefringence difference. Both regions of ring-banded and non-banded crystals are composed of edge-on lamellae, but the central-core lamellae undergo periodical waving up and down. The specific stage-wise and preferential interactions between PVPh and sc-PLA and glass substrate, which simultaneously occur during amorphous PVPh rejection and growth processes, were evaluated as some plausible kinetic reasons for the special composite crystal morphology of sc-PLA complex induced by blending with PVPh.
机译：在立体复杂的聚乳酸sc-PLA（PLLA：PDLA = 1：1）中与无定形聚对乙烯基苯酚（PVPh）（20-30 wt％）相互作用的带状核和非带状壳具有过渡模式通过使用偏光（POM），原子力（AFM）和扫描电子显微镜（SEM）进行了研究。球晶的中心核是带状的，在Tc = 160-180℃结晶的sc-PLA / PVPh混合物中，其外围转变为无带状。这种复合晶体的形态与纯净的sc-PLA，是马耳他十字形，在球晶中没有任何环纹。核心区域中的波段也与那些在经典环带中观察到的双折射差异明显不同。纤芯中的带仅显示晶体拓扑，没有双折射差异。带状和非带状晶体的两个区域都由边沿薄层组成，但中心核薄层会周期性地上下波动。评价了在无定形PVPh排斥和生长过程中同时发生的PVPh与sc-PLA和玻璃基板之间特定的阶段性和优先相互作用，这是掺混引起的sc-PLA配合物特殊复合晶体形态的一些合理的动力学原因。与PVPh。

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