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Hangzhou, China

Sha L.-Z.,Zhejiang University of Science and Technology | Zhao H.-F.,Zhejiang University of Science and Technology | Shao L.,Hangzhou Xinhua Group Co. | Kong J.-F.,Zhejiang University of Science and Technology
IPPTA: Quarterly Journal of Indian Pulp and Paper Technical Association | Year: 2013

In order to obtain low weight filter paper with good liquid absorbency, cotton pulp, softwood pulp and mercerized pulp were used as raw fibrous materials, and filter paper of 200g/m2 was made by changing fiber composition and beating degree of pulp. Pore structure of filter paper, capillary liquid absorbing height and surface water absorbency were used to characterize the water absorbency of filter paper, and fiber quality analyzer (FQA) was used to observe the surface morphology of filter paper. Results show that the water absorbing capacity and thickness of the finished filter paper would be 580-590g/m2 and 0.4mm, respectively, which meet the requirements of the low weight liquid absorbent filter paper when the mixed pulp was comprised of 65% softwood pulp, 20-25% mercerized pulp and 10-15% cotton pulp, and the beating degree of mixed pulp was at about 19°SR. Source

Yu Y.,Zhejiang Sci-Tech University | Zhang Y.,Zhejiang Sci-Tech University | Yang X.,Zhejiang Sci-Tech University | Liu H.,Zhejiang Sci-Tech University | And 3 more authors.
Cellulose | Year: 2015

A cellulose-based superabsorbent exhibits excellent water absorbency and retention performance as well as biodegradability. However, the detailed biodegradation process in soil has not been monitored yet. Yellowing is another important factor affecting its appearance and storage. In this work, cellulose from flax yarn wastes (FYW) was used as the skeleton material to synthesize a cellulose-g-P(AA-co-AM) (FYW/PAA) superabsorbent. The properties of the FYW/PAA superabsorbent were characterized, especially its biodegradation process and yellowing mechanism. The resultant FYW/PAA presented excellent water absorbency and retention capabilities of 886 g/g in deionized water and 73.2 wt% after being dried at 60 °C for 12 h, respectively. The fracturing of β-1,4-glycosidic bonds on the flax-cellulose macromolecules is the main reason for the biodegradation of FYW/PAA in soil. This causes a 70.8 wt% degradation after FYW/PAA has been buried in soil for only 60 days. The drying method and UV irradiation have important implications for the yellowing of FYW/PAA. They facilitate the generation of chromophore and auxochrome groups on the flax-cellulose macromolecules. 2,6-Di-tert-butyl-4-methylphenol (BHT) exhibits excellent antioxidant properties to inhibit the yellowing of FYW/PAA products. © 2015, Springer Science+Business Media Dordrecht. Source

Zhu H.,Zhejiang Sci-Tech University | Zhang Y.,Zhejiang Sci-Tech University | Yang X.,Zhejiang Sci-Tech University | Shao L.,Hangzhou Xinhua Group Co. | And 2 more authors.
Carbohydrate Polymers | Year: 2016

The discharge of effluents from surfactant manufacturers is giving rise to increasingly serious environmental problems. In order to develop the eco-friendly flocculation materials to achieve effective removal of pollutants from the surfactant effluents, the bamboo pulp cellulose from Phyllostachys heterocycla is employed as the skeleton material to synthesize an eco-friendly bamboo pulp cellulose-g-polyacrylamide (BPC-g-PAM) for flocculation. The BPC-g-PAM is used with the metal ions as the coagulant to treat the effluent from a surfactant manufacturer. The response surface methodology coupled with Box-behnken design is employed to optimize the key factors of coagulation-flocculation. The results show that the combination of Fe3+ with BPC-g-PAM achieves the best coagulation-flocculation performance like, the fast treatment time, minimum coagulant and BPC-g-PAM dosages compared with the other two combinations of Al3+ with BPC-g-PAM and Ca2+ with BPC-g-PAM. Therefore, the combination of Fe3+ with BPC-g-PAM is expected to promote its application for the pollution control in the surfactant manufacturers. © 2015 Elsevier Ltd. All rights reserved. Source

Zhou H.,Zhejiang Sci-Tech University | Zhu H.,Zhejiang Sci-Tech University | Yang X.,Zhejiang Sci-Tech University | Zhang Y.,Zhejiang Sci-Tech University | And 5 more authors.
BioResources | Year: 2015

Due to their unique physical and chemical properties, hygrogels have been applied in various industrial and agricultural fields. Biomedicine is another high value-added and attractive area for the application of hydrogels. For this reason, a novel temperature/pH sensitive cellulose based hydrogel was synthesized based on the cellulose from Phyllostachys heterocycla. Its synthesis conditions were optimized, and its loading and release capabilities for model drugs were investigated in detail. The resultant data showed that the synthesized hydrogel exhibited the highest swelling ratio at 37 °C and pH 7.4, corresponding to the temperature and pH of the human intestinal environment. The hydrogel held excellent load performance for model drug MB and an obvious temperature dependence at 37 °C (body temperature of human) when the model drug was released from it. These positive results suggest that the synthesized temperature/pH sensitive cellulose-based hydrogel has a great potential for oral drug delivery applications. Source

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