Poly[R-3-hydroxybutyrate-co-(R-3-hydroxyvalerate)] (PHBVs) copolymers are promising biopolymers, which could substitute petroleum-based plastics for various applications. PHB and PHBV pellets were processed on a custo...Poly[R-3-hydroxybutyrate-co-(R-3-hydroxyvalerate)] (PHBVs) copolymers are promising biopolymers, which could substitute petroleum-based plastics for various applications. PHB and PHBV pellets were processed on a customized 3D printer via Fused Granular Manufacturing (FGM) approach modified with a Mahor screw extruder. To anticipate the behaviour of PHBVs when transformed using conventional thermo-mechanical shaping processes, thermal and mechanical analyses were carried out in order to better understand the effect of annealing temperature on their crystallization behaviour and mechanical properties of PHB polymer and PHBV copolymer. The objectives of the present work were to propose an experimental strategy to study the melting and crystallization events, crystalline structure changes, and mechanical performances of both PHB homopolymer and PHBV copolymer according to identical thermal annealing treatments. A monitoring of 3D printed PHB and PHBV structures was achieved by coupling Differential Scanning Calorimetry (DSC) and tensile tests. .展开更多
The title compound （-）-N-[（3R）-3-cyclohexyl]-3-phenylpropananoyl]bornane-10,2sultam （C 25 H 35 NO 3 S,M r=429.60）,a derivative of camphorsultam,crystallizes in the monoclinic space group P2 1 /c with a=10.3301（...The title compound （-）-N-[（3R）-3-cyclohexyl]-3-phenylpropananoyl]bornane-10,2sultam （C 25 H 35 NO 3 S,M r=429.60）,a derivative of camphorsultam,crystallizes in the monoclinic space group P2 1 /c with a=10.3301（7）,b=19.4040（13）,c=11.8106（8）,β=100.5580（10）°,V=2327.3（3） 3,Z=4,D c=1.226 g/cm 3,λ=0.71073,μ（MoKα）=0.165 mm-1 and F（000）=928.X-ray diffraction analysis reveals that the six-membered ring of sultam shows a boat form （Fig.1）.The planes constructed by （C（4）,C（5）,C（6）,C（7）） and （C（7）,C（8）,C（9）,C（4）） form a dihedral angle of 69.5°.The C（1）-C（2）-C（3） plane forms dihedral angles to the aforementioned planes of 89.8（1） and 85.9（3）°,respectively.And molecules are linked via hydrogen bonding （C-H···N/O） interactions.展开更多
文摘Poly[R-3-hydroxybutyrate-co-(R-3-hydroxyvalerate)] (PHBVs) copolymers are promising biopolymers, which could substitute petroleum-based plastics for various applications. PHB and PHBV pellets were processed on a customized 3D printer via Fused Granular Manufacturing (FGM) approach modified with a Mahor screw extruder. To anticipate the behaviour of PHBVs when transformed using conventional thermo-mechanical shaping processes, thermal and mechanical analyses were carried out in order to better understand the effect of annealing temperature on their crystallization behaviour and mechanical properties of PHB polymer and PHBV copolymer. The objectives of the present work were to propose an experimental strategy to study the melting and crystallization events, crystalline structure changes, and mechanical performances of both PHB homopolymer and PHBV copolymer according to identical thermal annealing treatments. A monitoring of 3D printed PHB and PHBV structures was achieved by coupling Differential Scanning Calorimetry (DSC) and tensile tests. .
基金sponsored by the Science Foundation of Ministry of Education for the New Teacher at the University of China (No. 20070511006)the Research Initiation Funds of Huazhong Agricultural University (No. 52204-09057)
文摘The title compound （-）-N-[（3R）-3-cyclohexyl]-3-phenylpropananoyl]bornane-10,2sultam （C 25 H 35 NO 3 S,M r=429.60）,a derivative of camphorsultam,crystallizes in the monoclinic space group P2 1 /c with a=10.3301（7）,b=19.4040（13）,c=11.8106（8）,β=100.5580（10）°,V=2327.3（3） 3,Z=4,D c=1.226 g/cm 3,λ=0.71073,μ（MoKα）=0.165 mm-1 and F（000）=928.X-ray diffraction analysis reveals that the six-membered ring of sultam shows a boat form （Fig.1）.The planes constructed by （C（4）,C（5）,C（6）,C（7）） and （C（7）,C（8）,C（9）,C（4）） form a dihedral angle of 69.5°.The C（1）-C（2）-C（3） plane forms dihedral angles to the aforementioned planes of 89.8（1） and 85.9（3）°,respectively.And molecules are linked via hydrogen bonding （C-H···N/O） interactions.
