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Số người truy cập: 106,074,331

 
Tác giả hoặc Nhóm tác giả: Warinporn Klunklin, Kittisak Jantanasakulwong, Yuthana Phimolsiripol, Noppol Leksawasdi, Phisit Seesuriyachan, Thanongsak Chaiyaso, Chayatip Insomphun, Suphat Phongthai, Pensak Jantrawut, Sarana Rose Sommano, Winita Punyodom, Alissara Reungsang,Thi Minh Phuong Ngo and Pornchai Rachtanapun
Nơi đăng: Polymers, (SCIE - Q1); Số: 13, 81;Từ->đến trang: 1-15, . https://dx.doi.org/10.3390/polym13010081;Năm: 2020
Lĩnh vực: Kỹ thuật; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT

ABSTRACT
Cellulose fromAsparagus officinalisstalk end was extracted and synthesized to carboxymethylcellulose (CMCas) using monochloroacetic acid (MCA) via carboxymethylation reaction with varioussodium hydroxide (NaOH) concentrations starting from 20% to 60%. The cellulose and CMCaswerecharacterized by the physical properties, Fourier Transform Infrared spectroscopy (FTIR), Differentialscanning calorimetry (DSC), Scanning electron microscopy (SEM) and X-ray diffraction (XRD). In ad-dition, mechanical properties of CMC a sfilms were also investigated. The optimum condition forproducing CMCaswas found to be 30% of NaOH concentration for the carboxymethylation reaction,which provided the highest percent yield of CMCasat 44.04% with the highest degree of substitution(DS) at 0.98. The melting point of CMCasdecreased with increasing NaOH concentrations. Crys-tallinity of CMCaswas significantly deformed (p< 0.05) after synthesis at a high concentration. TheL*value of the CMCaswas significantly lower at a high NaOH concentration compared to the cellulose.The highest tensile strength (44.59 MPa) was found in CMCasfilm synthesized with 40% of NaOHconcentration and the highest percent elongation at break (24.99%) was obtained in CMCasfilmtreated with 30% of NaOH concentration. The applications of asparagus stalk end are as biomaterialsin drug delivery system, tissue engineering, coating, and food packaging.
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