Rahman Mohammed Mizanur, Afrin Sanjida, Haque Papia
Department of Applied Chemistry and Chemical Engineering, University of Dhaka, Dhaka, 1000, Bangladesh.
Prog Biomater. 2014 Apr 3;3(1):23. doi: 10.1007/s40204-014-0023-x.
Cellulose crystals (CC) were chemically derived from jute by alkali treatment, bleaching and subsequent hydrolysis with 40 % sulfuric acid. Infrared spectroscopy (FT-IR) suggested sufficient removal of lignin and hemicellulose from the raw jute and scanning electron microscopy (SEM), and X-ray diffraction (XRD) studies demonstrated the preparation of microcrystalline cellulose. CC reinforced polyvinyl alcohol (PVA) composite was prepared by solution casting method under laminar flow. In order to maintain uniform dispersion of 3-15 % (w/w) of the CC in the composite N, N dimethylformamide (DMF) was used as a dispersant. FT-IR, XRD, SEM, thermogravimetric analysis (TG, DTG and DTA) and thermomechanical analyses (TMA) were used to characterize the CC and the composites. The study of tensile properties showed that tensile strength (TS) and modulus (TM) increase with increasing CC content up to 9 % and then decrease with the addition of a high content of CC (above 9 %) because of the aggregation of CCs in the composite. The highest TS (43.9 MPa) and TM (2,190 MPa) have been shown to be the composite prepared with 9 % CC and the lowest to be from pure PVA film 17.1 and 1470 MPa. In addition, the composites have showed no cytotoxicity that can also prohibit microbial growth and; hence, it can be a potential material for biomedical applications such as wound healing accelerators.
纤维素晶体（CC）通过碱处理、漂白以及随后用40%硫酸水解从黄麻中化学衍生而来。红外光谱（FT-IR）表明从生黄麻中充分去除了木质素和半纤维素，扫描电子显微镜（SEM）和X射线衍射（XRD）研究证明了微晶纤维素的制备。CC增强聚乙烯醇（PVA）复合材料通过层流条件下的溶液浇铸法制备。为了使3-15%（w/w）的CC在复合材料中保持均匀分散，使用N，N-二甲基甲酰胺（DMF）作为分散剂。采用FT-IR、XRD、SEM、热重分析（TG、DTG和DTA）以及热机械分析（TMA）对CC和复合材料进行表征。拉伸性能研究表明，随着CC含量增加至9%，拉伸强度（TS）和模量（TM）增加，而添加高含量CC（高于9%）后则下降，这是由于复合材料中CC发生聚集。已表明含9%CC的复合材料具有最高的TS（43.9MPa）和TM（2190MPa），而纯PVA薄膜的TS和TM最低，分别为17.1MPa和1470MPa。此外，复合材料未显示出细胞毒性，还能抑制微生物生长；因此，它可能是伤口愈合促进剂等生物医学应用的潜在材料。
