Abstract Paper strengthening agent is more and more important in the current papermaking industry. In this study, carboxymethyl starch-grafted-polyacrylamide (CMS-g-PAM) was synthesized via grafting polyacrylamide onto carboxymethyl starch (CMS), and added in a recycled pulp furnish to make handsheets. The structure and surface morphology of CMS-g-PAM were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy. The effects of CMS-g-PAM dosage and addition way on the properties of the paper were investigated. The results showed that CMS-g-PAM could improve the paper mechanical properties through both wet end addition and surface spraying, and surface spraying had a better improvement at the same dosage. CMS-g-PAM was more effective in improving paper mechanical properties than CMS, when it comes to the same addition way and the same dosage. SEM analysis demonstrated that CMS-g-PAM could increase the inter-fiber bonding.

中文翻译：

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表面喷涂羧甲基淀粉接枝聚丙烯酰胺提高再生纸力学性能

摘要 造纸增强剂在当前造纸工业中越来越重要。在这项研究中，通过将聚丙烯酰胺接枝到羧甲基淀粉 (CMS) 上合成了羧甲基淀粉接枝聚丙烯酰胺 (CMS-g-PAM)，并将其添加到回收纸浆配料中以制造手抄纸。CMS-g-PAM的结构和表面形貌通过傅里叶变换红外光谱、扫描电子显微镜进行表征。考察了CMS-g-PAM用量和添加方式对纸张性能的影响。结果表明，CMS-g-PAM通过湿部添加和表面喷涂均能提高纸张力学性能，且在相同用量下表面喷涂有更好的改善效果。CMS-g-PAM 在改善纸张机械性能方面比 CMS 更有效，同样的添加方式，同样的用量。SEM 分析表明 CMS-g-PAM 可以增加纤维间的结合。