Characterization on Molecular Weight of Polyamic Acids Using GPC Coupled with Multiple Detectors

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Weight of Polyamic Acids Using GPC Coupled with Multiple Detectors</title> <meta name="description" content="Characterization on Molecular Weight of Polyamic Acids Using GPC Coupled with Multiple Detectors"> <meta name="keywords" content="Polyamic acids, Polyelectrolyte effects, Gel permeation chromatography, Mobile phase, Molecular weight"> <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no"> <meta charset="utf-8"> <link href="https://cdn.waset.org/favicon.ico" type="image/x-icon" rel="shortcut icon"> <link href="https://cdn.waset.org/static/plugins/bootstrap-4.2.1/css/bootstrap.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/plugins/fontawesome/css/all.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/css/site.css?v=150220211555" rel="stylesheet"> </head> <body> <header> <div class="container"> <nav class="navbar navbar-expand-lg navbar-light"> <a class="navbar-brand" 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</div> <div class="card publication-listing mt-3 mb-3"> <h5 class="card-header" style="font-size:.9rem">Characterization on Molecular Weight of Polyamic Acids Using GPC Coupled with Multiple Detectors</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Mei%20Hong">Mei Hong</a>, <a href="https://publications.waset.org/abstracts/search?q=Wei%20Liu"> Wei Liu</a>, <a href="https://publications.waset.org/abstracts/search?q=Xuemin%20Dai"> Xuemin Dai</a>, <a href="https://publications.waset.org/abstracts/search?q=Yanxiong%20Pan"> Yanxiong Pan</a>, <a href="https://publications.waset.org/abstracts/search?q=Xiangling%20Ji">Xiangling Ji</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Polyamic acid (PAA) is the precursor of polyimide (PI) prepared by a two-step method, its molecular weight and molecular weight distribution not only play an important role during the preparation and processing, but also influence the final performance of PI. However, precise characterization on molecular weight of PAA is still a challenge because of the existence of very complicated interactions in the solution system, including the electrostatic interaction, hydrogen bond interaction, dipole-dipole interaction, etc. Thus, it is necessary to establisha suitable strategy which can completely suppress these complex effects and get reasonable data on molecular weight. Herein, the gel permeation chromatography (GPC) coupled with differential refractive index (RI) and multi-angle laser light scattering (MALLS) detectors were applied to measure the molecular weight of (6FDA-DMB) PAA using different mobile phases, LiBr/DMF, LiBr/H3PO4/THF/DMF, LiBr/HAc/THF/DMF, and LiBr/HAc/DMF, respectively. It was found that combination of LiBr with HAc can shield the above-mentioned complex interactions and is more conducive to the separation of PAA than only addition of LiBr in DMF. LiBr/HAc/DMF was employed for the first time as a mild mobile phase to effectively separate PAA and determine its molecular weight. After a series of conditional experiments, 0.02M LiBr/0.2M HAc/DMF was fixed as an optimized mobile phase to measure the relative and absolute molecular weights of (6FDA-DMB) PAA prepared, and the obtained Mw from GPC-MALLS and GPC-RI were 35,300 g/mol and 125,000 g/mol, respectively. Particularly, such a mobile phase is also applicable to other PAA samples with different structures, and the final results on molecular weight are also reproducible. <iframe src="https://publications.waset.org/abstracts/173439.pdf" style="width:100%; height:400px;" frameborder="0"></iframe> <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Polyamic%20acids" title="Polyamic acids">Polyamic acids</a>, <a href="https://publications.waset.org/abstracts/search?q=Polyelectrolyte%20effects" title=" Polyelectrolyte effects"> Polyelectrolyte effects</a>, <a href="https://publications.waset.org/abstracts/search?q=Gel%20permeation%20chromatography" title=" Gel permeation chromatography"> Gel permeation chromatography</a>, <a href="https://publications.waset.org/abstracts/search?q=Mobile%20phase" title=" Mobile phase"> Mobile phase</a>, <a href="https://publications.waset.org/abstracts/search?q=Molecular%20weight" title=" Molecular weight"> Molecular weight</a> </p> <a href="https://publications.waset.org/abstracts/173439/characterization-on-molecular-weight-of-polyamic-acids-using-gpc-coupled-with-multiple-detectors" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/173439.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">54</span> </span> </div> </div> </div> </main> <footer> <div id="infolinks" class="pt-3 pb-2"> <div class="container"> <div style="background-color:#f5f5f5;" class="p-3"> <div class="row"> <div class="col-md-2"> <ul class="list-unstyled"> About <li><a href="https://waset.org/page/support">About Us</a></li> <li><a href="https://waset.org/page/support#legal-information">Legal</a></li> <li><a target="_blank" rel="nofollow" href="https://publications.waset.org/static/files/WASET-16th-foundational-anniversary.pdf">WASET celebrates its 16th 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Characterization on Molecular Weight of Polyamic Acids Using GPC Coupled with Multiple Detectors