Phase Selection Pathways in Ultrathin Film Crystallization of a Low Molecular Weight Poly(ethylene oxide) Fraction on Mica Surfaces

Phase Selection Pathways in Ultrathin Film Crystallization of a Low Molecular Weight Poly(ethylene oxide) Fraction on Mica Surfaces
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云母表面低分子量聚环氧乙烷组分超薄膜结晶的相选择途径

DOI:
10.1021/ma201885g
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发表时间:
2011-10
期刊:
影响因子:
5.5
通讯作者:
Chen, Er-Qiang
Chen, Er-Qiang
中科院分区:
化学1区
文献类型:
--
作者:
Liu, Yi-Xin;Zhong, Lu-Wei;Su, Shi-Zhao;Chen, Er-Qiang

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利用原位原子力显微镜,我们监测了低分子量聚氧乙烷在云母表面的超薄膜结晶过程中的相选择路径。样品形成完整的折叠链(IF)单层晶体。从热力学角度看,在一次折叠链状晶体[IF(1)]的熔化温度[Tm(1)]附近,所研究的体系提供了一个由熔体相、扩链晶体稳定相[IF(0)]和介稳相IF(1)组成的三相模型。实验揭示了四条相选择路径,即熔体→IF(0)(S0)、熔体→IF(1)(S1)、IF(1)→IF(0)(S10),以及由后两者(S2)构成的复合路径。在Tm(1)附近的晶化温度下,首先选择的晶化途径取决于过冷度,这与Granasy-Oxtoby理论的预测一致。在一个分叉点的下面,位于S。
Utilizing in situ atomic force microscopy, we monitored the phase selection pathways of ultrathin film crystallization of a low molecular weight poly(ethylene oxide) fraction with two hydroxyl end groups and a number-average molecular weight of 3000 g/mol (HPEO3k) on mica surfaces. The sample forms integral folded chain (IF) monolayer crystals. From a thermodynamic point of view, in the vicinity of the melting temperature [Tm(1)] of the once-folded chain crystal [IF(1)], the system studied provides a three-phase model composed of the melt phase, the stable phase of extended chain crystals [IF(0)], and the metastable phase of IF(1). Four phase selection pathways, namely, melt → IF(0) (S0), melt → IF(1) (S1), IF(1) → IF(0) (S10), and a composite pathway built of the latter two (S2) have been revealed experimentally. The first selected pathway at crystallization temperatures near Tm(1) depends on the supercooling, in agreement with the predication of Granasy-Oxtoby theory. Below a bifurcation point located s...
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