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| Preparation of Nano- SiO2 Modified Branched Cationic Polyacrylamide and Its Application as Paper Strengthening Agent |
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| DOI： |
| Key Words:cationic polyacrylamide hyperbranched in-situ polymerization paper strengthening agent |
| Fund Project:国家“973”计划项目(2010CB732206)。 |
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| Abstract:Branched cationic polyacrylamide (BCPAM) was synthesized via free-radical solution polymerization of acrylamide ( AM) and methacrylatoethyl trimathyl ammonim chloride (DMC) (DMC) by using pentaerythritol (PETL) as the core molecule and ceric ammonium nitrate (Ce4+) as the initiator. The Nano- SiO2 was produced in BCPAM by hydrolysis of tetraethyl orthosilicate (TEOS) in situ and the resulted SiO2 interacted with BCPAM through physical crosslinking. The structure of SiO2-BCPAM was characterized by Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM)．The study results indicated that the initiator concentration, TEOS dosage and reaction time influenced the molecular weight or chain aggregation, and then the intrinsic viscosity．The SiO2-BCPAM exhibited significant paper strengthening performance. For instance, when the dosage of SiO2-BCPAM was 0.5% (based on oven dried pulp), the dry tensile index, burst index and tear index of the hand sheet were increased by 23.6%, 12.4% and 25.5% respectively. |
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