Mechanical Retention and Waterproof Properties of Bacterial Cellulose-Reinforced Thermoplastic Starch Biocomposites Modified with Sodium Hexametaphosphate

Materials

Da-wei Wang³  Ying-juan Xu³  Xin Li³  Chao-ming Huang²  Kuo-shien Huang²  Chuen-kai Wang¹  Jen-taut Yeh³ 

[1] Graduate School of Material Science and Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan; E-Mail:;Department of Materials Engineering, Kun Shan University, Tainan 710710, Taiwan; E-Mails:;Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials Ministry of Education, Key Laboratory for the Green Preparation and Application of Functional Materials, Faculty of Materials Science and Engineering, Hubei University, Wuhan 430062, China; E-Mails:

关键词: waterproof;    strength retention;    thermoplastic starch;   

DOI  :  10.3390/ma8063168

来源: mdpi

【 摘 要 】

The waterproof and strength retention properties of bacterial cellulose (BC)-reinforced thermoplastic starch (TPS) resins were successfully improved by reacting with sodium hexametaphosphate (SHMP). After modification with SHMP, the tensile strength (σ_f) and impact strength (I_s) values of initial and conditioned BC-reinforced TPS, modified with varying amounts of SHMP(TPS₁₀₀BC_0.02SHMP_x), and their blends with poly(lactic acid)((TPS₁₀₀BC_0.02SHMP_x)₇₅PLA₂₅) specimens improved significantly and reached a maximal value as SHMP content approached 10 parts per hundred parts of TPS resin (phr), while their moisture content and elongation at break (ɛ_f) was reduced to a minimal value as SHMP contents approached 10 phr. The σ_f, I_s and ɛ_f retention values of a (TPS₁₀₀BC_0.02SHMP₁₀)₇₅PLA₂₅ specimen conditioned for 56 days are 52%, 50% and 3 times its initial σ_f, I_s and ɛ_f values, respectively, which are 32.5 times, 8.9 times and 40% of those of a corresponding conditioned TPS₁₀₀BC_0.02 specimen, respectively. As evidenced by FTIR analyses of TPS₁₀₀BC_0.02SHMP_x specimens, hydroxyl groups of TPS₁₀₀BC_0.02 resins were successfully reacted with the phosphate groups of SHMP molecules. New melting endotherms and diffraction peaks of V_H-type crystals were found on DSC thermograms and WAXD patterns of TPS or TPS₁₀₀BC_0.02 specimens conditioned for 7 days, while no new melting endotherm or diffraction peak was found for TPS₁₀₀BC_0.02SHMP_x and/or (TPS₁₀₀BC_0.02SHMP_x)₇₅PLA₂₅ specimens conditioned for less than 14 and 28 days, respectively.

【 授权许可】

CC BY   
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