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首页> 外文期刊>Cellulose >The effect of electric charge density of polyacrylamide (PAM) on properties of PAM/cellulose nanofibril composite films
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The effect of electric charge density of polyacrylamide (PAM) on properties of PAM/cellulose nanofibril composite films

机译：聚丙烯酰胺（PAM）的电荷密度对PAM /纤维素纳米原纤维复合薄膜性能的影响

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Poly(acrylamides) (PAMs) with various anionic and cationic charge densities from -1.64 to +0.98 meq/g but similar molecular weights were synthesized through radical polymerization. One of the aqueous PAM solutions and an aqueous dispersion of 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized cellulose nanofibril (TOCN) were mixed at various PAM/TOCN weight ratios, and self-standing PAM/TOCN composite films were prepared by casting and drying. Because nonionic and cationic PAM molecules may have had some attractive interactions with anionic TOCN elements, the visual appearances and particle sizes of the mixtures varied depending on the charge densities of PAMs. In particular, PAM molecules with electric charge densities with +0.54 and +0.98 meq/g formed polyelectrolyte complexes with anionic TOCN elements, resulting in formation of large agglomerates in the aqueous mixtures. The PAM/TOCN composite films at weight ratios of 10/90 and 25/75 had higher Young's moduli and tensile strengths than those of 100 % TOCN film, when PAMs with charge densities from -1.64 to +0.54 were used. The PAM/TOCN composite films at the weight ratio of 10/90 had elongations at break similar to that of 100 % TOCN film, resulting in higher work of fracture values or ductile properties, whereas the PAM/TOCN composite films at the weight ratio of 25/75 were rather brittle.
机译：通过自由基聚合合成了各种阴离子和阳离子电荷密度为-1.64至+0.98 meq / g，但分子量相近的聚丙烯酰胺（PAM）。将PAM水溶液之一和2,2,6,6-四甲基哌啶-1-氧基（TEMPO）氧化的纤维素纳米原纤维（TOCN）的水分散体以各种PAM / TOCN重量比混合，然后将自立式PAM /通过流延和干燥制备TOCN复合膜。由于非离子和阳离子PAM分子可能会与阴离子TOCN元素发生某些吸引人的相互作用，因此混合物的外观和粒径取决于PAM的电荷密度。特别地，具有+0.54和+ 0.98meq / g的电荷密度的PAM分子形成了具有阴离子TOCN元素的聚电解质络合物，导致在水性混合物中形成大的附聚物。当使用电荷密度为-1.64至+0.54的PAM时，重量比为10/90和25/75的PAM / TOCN复合膜具有比100％TOCN膜更高的杨氏模量和拉伸强度。重量比为10/90的PAM / TOCN复合膜的断裂伸长率与100％TOCN膜的断裂伸长率相似，从而导致更高的断裂值或韧性性能，而重量比为PAM / TOCN的PAM / TOCN复合膜25/75相当脆。

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