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The Effect of Different Methods to Pretreat Reed Pulp on the Crystallinity of Microcrystalline Cellulose WenLong Zhang1,a, WenLong Zhao1, 2 b *and YaJie Dai1, c 1College of Material Science & Engineering, Harbin University of Science and Technology, Harbin, 150040, Heilongjiang, China 2Ministry of Education Key Laboratory of Engineering Dielectrics and Its Application, Heilongjiang Province Key Laboratory of Dielectrics Engineering, State Key Laboratory Cultivation Base, Harbin, 150080, Heilongjiang, China azhangwenlong2004@yeah.net, bmissey163@163.com, c583618917@qq.com Keywords: reed; microcrystalline cellulose; pretreatment; crystallinity; crystallite size Abstract.
Reed pulp was raw material that pretreated by four methods {ultrasonic, microwave, N, N-dimethyl acetamide (DMAc) and tetrahydrofuran (THF)}.
Experiment Materials and Reagents Reed cellulose pulp, the degree of polymerization is 500 to 800, and the content of α-cellulose is higher than 93%; hydrochloric acid (HCl) and distilled water, Harbin Xinchun chemical co., LTD; DMAc and THF, Tianjin Fuyujingxi chemical co., LTD.
It resulted in promotion of swelling of the crystalline region and reduction of crystallinity of materials, owing to the broken of the original crystal structure of cellulose.
"Synthesis and characterization of microcrystalline cellulose produced from bacterial cellulose," Journal of Thermal Analysis and Calorimetry, vol. 106, 2011, pp. 703-709

Experimental Materials and Methods Materials The densities of common plastics were shown in Table 1.
As shown in Fig. 1, PET was the sinking material.
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The experiment materials and methods The source and fundamental indicators of wastewater.
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Grouting in the soil and backfilling materials are modeled by the change of soil parameters.
The material characteristics are summarized in Tables 1 and 2.
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Introduction The dental ceramic are restorative materials widely used by dental surgeons, because they simulate the aesthetic and functional characteristics of the natural dentition.
Materials and methods The materials used in this study and their characteristics are shown in Table 1.
Lins: Materials Science Forum Vols 727-728 (2012), p. 826
Yondem: Journal of Non-Crystalline Solids.
GUERRA: International Journal of Dentistry Vol. 6 (2) (2007), p. 58.

Wellmann, Advanced Engineering Materials, Issue 22. 1900778 (2019)
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When these techniques are used, grafting materials should optimally be osteoinductive and osteoconductive, easy obtainable, safe, malleable, biocompatible, space maintaining and stable after positioning.
In the past few decades the establishment off well regulated tissue banks has enabled dental surgeons to avoid trauma of autograft retrieval by using allograft bone materials to fill a variety of jaw bone defects [3].
Whether for native bone regeneration or grafting with autogenous bone, allogenic materials, bone substitutes or composites grafts, PRP accelerates and enhances the formation of new bone [2, 4, 5].
Even if, nowadays, allografts are available on the market, resorption is reported to take place; this occurs for particulate grafting materials, irrespective of its source due to micromotions at the contact between grafting material and reception site [10].
Conclusion: This study presents a comparison between two clinical cases where different grafting materials were used.

Materials and methods The nutrition solution used was Hoagland solution.
Acknowledgments This study was financially supported by the National Natural Science Foundation Key Program (No. 40930739).
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To enhance the teaching material reform.
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