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Quantifying the Chain Folding in Polymer Single Crystals by Single-Molecule Force Spectroscopy

机译:通过单分子力光谱量量化聚合物单晶中的链折叠

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摘要

Chain folding is a motif of polymer crystallization, which is essential for determining the crystallization kinetics. However, the experimental quantification of the chain folding remains a challenge because of limited instrumental resolution. Here, we quantify chain folding in solution-grown single crystals by using atomic force microscopy (AFM)-based single-molecule force spectroscopy. The fingerprint spectrum of force-induced chain motion allows us to decipher the adjacent and nonadjacent re-entry folding with spatial resolution of subnanometers. The average fractions of adjacent re-entry folds < f > are in the range 91-95% for polycaprolactone, poly-L-lactic acid, and polyamide 66, which is higher than the values determined by other classical technologies. The established single-molecule method is applicable to a broad range of crystalline polymer system with different chain conformations or compositions.
机译:链折叠是聚合物结晶的基序,这对于确定结晶动力学是必不可少的。 然而,由于有限的仪器分辨率,链折叠的实验量仍然是一个挑战。 这里,通过使用原子力显微镜(AFM)的单分子力光谱法量化溶液生长的单晶中的链折叠。 力诱导的链运动的指纹谱允许我们破译相邻和非相邻的重新进入折叠,其空间分辨率的空间分辨率。 相邻的再入折叠折叠的平均级分在聚己内酯,聚-L-乳酸和聚酰胺66的91-95%的范围内,其高于其他经典技术确定的值。 所建立的单分子法适用于具有不同链构象或组合物的宽范围的晶体聚合物体系。

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  • 来源
    《ACS Macro Letters》 |2019年第9期|共6页
  • 作者单位

    Jilin Univ Coll Chem State Key Lab Supramol Struct &

    Mat Changchun 130012 Jilin Peoples R China;

    Jilin Univ Coll Chem State Key Lab Supramol Struct &

    Mat Changchun 130012 Jilin Peoples R China;

    Jilin Univ Coll Chem State Key Lab Supramol Struct &

    Mat Changchun 130012 Jilin Peoples R China;

    Jilin Univ Coll Chem State Key Lab Supramol Struct &

    Mat Changchun 130012 Jilin Peoples R China;

    Jilin Univ Coll Chem State Key Lab Supramol Struct &

    Mat Changchun 130012 Jilin Peoples R China;

    Jilin Univ Coll Chem State Key Lab Supramol Struct &

    Mat Changchun 130012 Jilin Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 有机化学;
  • 关键词

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