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Synthesis and meticulous molecular, morphological and thermal characterization of linear and star-shaped polycaprolactones

机译：线性和星状多己内酯的合成和细致分子，形态学和热表征

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摘要

In this study, linear and star-shaped polycaprolactones with varying numbers of arms are synthesized by ring opening of 3-caprolactone. The polymers were characterized in detail to obtain information of by-products in the samples. Size exclusion chromatography could not differentiate products with similar molar mass but different architecture and if there are any by-products in the sample. Liquid chromatography at critical conditions (LCCC) on NP and RP columns provided more insight into the product composition with regard to number of arms and possible by-products. MALDI-TOF MS analysis confirmed the structures and successful separation of targeted product from unwanted by-product. 2D-LC by coupling of LCCC to SEC in the second dimension demonstrated the similar size of the products that are separated successfully by LCCC. The purity and analysis of star-shaped precursor is imperative for further synthesis of star-block copolymers that is not given much attention in published literature. Thermal and morphological properties of the polycaprolactones with similar molar mass but different architectures are evaluated by DSC, TGA and AFM.
机译：在该研究中，通过环形开口的3-己内酯的环开口合成具有不同数量的臂的线性和星形多己酮。详细表征聚合物，以获得样品中的副产物的信息。尺寸排除色谱法不能区分具有类似摩尔质量但不同架构的产品，以及如果样品中有任何副产物。在NP和RP柱上的临界条件（LCCC）液相色谱法提供了对产品组合物的更多洞察力，关于武器数和可能的副产物。 MARDI-TOF MS分析证实了靶向产品的结构和成功分离副产品。第二尺寸通过LCCC至SEC耦合的2D-LC表现出通过LCCC成功分离的产品的相似大小。星形前体的纯度和分析是进一步合成星形嵌段共聚物的迫使，所述星形嵌段共聚物在发表的文献中没有受到许多关注。通过DSC，TGA和AFM评估具有相似摩尔质量但不同架构的聚己内酮的热和形态学性质。

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  • 来源
    《RSC Advances》 |2016年第100期|共11页
  • 作者

    Irfan Muhammad; Oh Joongsuk; Musharraf Syed Ghulam; Shah Muhammad Raza; Ahmed Shakil; Malik Muhammad Imran;

  • 作者单位

    Univ Karachi HEJ Res Inst Chem ICCBS Karachi 75270 Pakistan;

    Pohang Univ Sci &

    Technol POSTECH Dept Chem Div Adv Mat Sci Pohang 790784 South Korea;

    Univ Karachi HEJ Res Inst Chem ICCBS Karachi 75270 Pakistan;

    Univ Karachi HEJ Res Inst Chem ICCBS Karachi 75270 Pakistan;

    Univ Karachi HEJ Res Inst Chem ICCBS Karachi 75270 Pakistan;

    Univ Karachi HEJ Res Inst Chem ICCBS Karachi 75270 Pakistan;

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  • 正文语种 eng
  • 中图分类 化学;
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