Structure of Phosphate Amphoteric Cassava Starch and Its Reinforcing Effect on Secondary Fiber
In the present work,a series of the phosphate amphoteric cassava starch was synthesized by a two-step semi-dry process with 3-chloro-2-hydroxypropyltrimethyl ammonium chloride (CTA) as the cationic reagent and phosphate mixture as the anionic reagent.The structure of the amphoteric starch was characterized by Fourier transform infrared spectroscopy (FTIR),X-ray diffraction (XRD) and scanning electron microscopy (SEM).The reinforcing effects of the amphoteric starch on the secondary fiber were also studied.The results indicated that the reaction occurred not only on the surface but also in the interior of starch granule,not only in the amorphous region,but also in the crystalline region.All the amphoteric starch showed reinforcing effect on the secondary fiber.The No.5 sample showed better reinforcing effects on paper strength due to its higher total degree of substitution (0.095),proper DSA/DSC ratio (DSC=0.067,DSA=0.028) and interior modification of the starch granule.Compared with the control sample,the secondary fiber paper with 1.0 wt% (relative to dried pulp) of No.5 phosphate amphoteric starch showed 25.6%,21.4% and 29.4% increases in tensile index,tearing index,and burst index,respectively.
amphoteric starch structure secondary fiber paper reinforcing effect
Dede Yu Hongwei Zhang
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology,Guangzhou 510640, China
国际会议
太原
英文
87-91
2012-06-23（万方平台首次上网日期，不代表论文的发表时间）