Abstract:Recently, considerable efforts are made by the engine researches all over the world, focusing primarily on achieving ultra-low emissions of NOx (nitrogen oxides) and soot without any compromise to high thermal efficiency from dual-fuel engine. In this study, combustion performance and engine-out emission of a single cylinder gasoline-diesel dual-fuel engine are numerically investigated by employing a commercial computation fluid dynamics (CFD) software, especially developed for internal combustion engines mode… Show more
“…A pH meter was used to measure the pH change (Hanna Instruments; HI96107). The fiber liquor ratio was maintained at 1 g:80 mL and the bleaching temperature was kept between 85 and 90°C for 1.5 h 24 . At the beginning of the bleaching reaction, 1.0 mL buffer solution (made of CH 3 COOH/CH 3 COONa, and pH 4) was added for every 10 mL of the solution to maintain the constant pH throughout the reaction process.…”
L‐ and D‐ form oligo(lactic acid)s (OLLA and ODLA) grafted α‐cellulose (OLLA‐g‐cellulose and ODLA‐g‐cellulose) were prepared by the graft polycondensation reaction in C6H5CH3 medium at 130°C and 380 mm of mercury pressure. Para‐toluene sulphonic acid (5 wt% of oligo(lactic acid)) was used as a catalyst whereas potassium persulfate (0.01 wt% of oligo(lactic acid)) was used as a co‐catalyst in the graft polycondensation reaction. OLLA and ODLA with a degree of polymerization (DP) 6–7 used in polycondensation reaction were also prepared by ring‐opening polymerization of L‐ and D‐lactides at 140°C for 10 h with stannous octoate (C16H30O4Sn) as a motivator, L, and D monomer of lactic acids as co‐motivators. FTIR analysis proved the bonding of OLLA and ODLA onto the α‐cellulose surface. The thermal properties of poly(L‐lactic) acid (PLLA) composites were explored by thermal analysis (TG, DTA, and DTG). Degradation, melting, and maximum weight loss temperature of the composites were increased with the increase of grafted cellulose up to 10% and then decreased. TG and DTA results showed that the incorporation of grafted α‐cellulose (grafted cellulose) can improve the thermal properties of PLLA composites.Highlights
Synthesis of oligo(lactic acid)s from L‐ and D‐lactides by ring‐opening polymerization reactions.
α‐cellulose extraction and graft modification with oligo(lactic acid)s.
Preparation of grafted α‐cellulose composite with PLLA matrix.
Evaluation of thermal properties of the grafted α‐cellulose‐reinforced composites.
“…A pH meter was used to measure the pH change (Hanna Instruments; HI96107). The fiber liquor ratio was maintained at 1 g:80 mL and the bleaching temperature was kept between 85 and 90°C for 1.5 h 24 . At the beginning of the bleaching reaction, 1.0 mL buffer solution (made of CH 3 COOH/CH 3 COONa, and pH 4) was added for every 10 mL of the solution to maintain the constant pH throughout the reaction process.…”
L‐ and D‐ form oligo(lactic acid)s (OLLA and ODLA) grafted α‐cellulose (OLLA‐g‐cellulose and ODLA‐g‐cellulose) were prepared by the graft polycondensation reaction in C6H5CH3 medium at 130°C and 380 mm of mercury pressure. Para‐toluene sulphonic acid (5 wt% of oligo(lactic acid)) was used as a catalyst whereas potassium persulfate (0.01 wt% of oligo(lactic acid)) was used as a co‐catalyst in the graft polycondensation reaction. OLLA and ODLA with a degree of polymerization (DP) 6–7 used in polycondensation reaction were also prepared by ring‐opening polymerization of L‐ and D‐lactides at 140°C for 10 h with stannous octoate (C16H30O4Sn) as a motivator, L, and D monomer of lactic acids as co‐motivators. FTIR analysis proved the bonding of OLLA and ODLA onto the α‐cellulose surface. The thermal properties of poly(L‐lactic) acid (PLLA) composites were explored by thermal analysis (TG, DTA, and DTG). Degradation, melting, and maximum weight loss temperature of the composites were increased with the increase of grafted cellulose up to 10% and then decreased. TG and DTA results showed that the incorporation of grafted α‐cellulose (grafted cellulose) can improve the thermal properties of PLLA composites.Highlights
Synthesis of oligo(lactic acid)s from L‐ and D‐lactides by ring‐opening polymerization reactions.
α‐cellulose extraction and graft modification with oligo(lactic acid)s.
Preparation of grafted α‐cellulose composite with PLLA matrix.
Evaluation of thermal properties of the grafted α‐cellulose‐reinforced composites.
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