Mechanical properties and biomass carbon ratios of poly(butylene succinate) composites filled with starch and cellulose filler using furfural as plasticizer

Polymer composites consisting of poly(butylene succinate) (PBS) as matrix and corn starch (CS) or cellulose filler (CF) with a small amount of furfural (FR) from biomass were prepared by a hot‐pressing method at 120°C from a powder mixture. Mechanical properties of the composites' films were investigated using tensile test methods. The strain of these films was found to be developed by adding CS or CF and further improved by adding FR. The strain at break PBS with 15 wt % FR was improved by more than 16 times of that of PBS without FR. The biomass carbon ratios of polymer composites with oil‐based PBS (major component) and with biobased CS, CF, and FR were evaluated by ¹⁴C concentration ratio measured by accelerator mass spectrometry (AMS) based on ASTM D6866. PBS with 40 wt % CS or CF had a biomass carbon ratio of 31 and 36%, respectively. PBS with 15 wt % FR had a biomass carbon ratio of 3.4%. This deviation was confirmed by FR content calculated from the peak area of the ¹H‐NMR spectrum of PBS with FR which was 3.4%, almost the same as the biomass carbon ratio measured by AMS. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

辛烯基琥珀酸淀粉酯作为微胶囊壁材的应用研究

以低黏度的纯胶为壁材制得的微胶囊产品,其干燥速度、油的包埋率、货架稳定性、粉末在水中的分散溶化能力及自由流动性和斥水性,都优于阿拉伯胶、糊精、麦芽糊精等壁材原料做成的产品。具有良好的自由流动性和分散性,在不同温度和相对湿度条件下十分稳定。本文就低黏度纯胶作为微胶囊壁材的应用详细地介绍了这类产品的结构、品种、性能、应用情况。     

Cellular morphology evolution of chain extended poly(butylene succinate)/organic montmorillonite nanocomposite foam

Polymer foam with complex cellular structure (CCS) possessing both large cell and small cell simultaneously has lower density as well as better mechanical and thermal properties than those with mono-porous cell structure, which could be applied in the fields of packaging and construction materials. In this article, organic montmorillonite (OMMT) was introduced into chain-extended poly(butylene succinate) (CPBS) through melt blending method. CCS in the resultant CPBS samples were generated in a stainless steel autoclave using supercritical CO₂ as physical blowing agent by a cooling and two-step depressurization method. The crystallization temperature and crystallinity of CPBS increased by 4 °C and 2% respectively, due to the introduction of OMMT. Exfoliated structure of OMMT and some fish scale-like OMMT were observed in the CPBS/OMMT nanocomposites. The optimum range of the first depressurization between 1 and 7 MPa for fabricating the CCS in the CPBS foams with different contents of OMMT was obtained. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47107     

Preparation and characterisation of octenyl succinate starch as a delivery carrier for bioactive food components

The octenyl succinic anhydride (OSA) modified corn starch (OSAS) was synthesised with different degrees of substitution (DS) and the influences of three factors namely OSA/starch ratio, reaction temperature, and reaction time on the DS of OSAS were studied by response surface methodology (RSM). As a delivery carrier material, the characteristics of OSAS were investigated. The resistant starch (RS) content of OSAS was increased with increasing DS, indicating the improvement of colon-targeting property. The swelling ratio (SR) of the OSAS in simulated gastrointestinal fluids was higher than that of native starch and its hydrophilicity was decreased with increasing DS. For in vitro release study, the percentage of released bioactive components was less than 7% within the first 8 h and close to 100% over a period of 36 h when the DS was 0.60. These results demonstrate that OSAS can be a potential carrier for colon-targeted delivery of bioactive food components.     

维生素E丁二酸单酯的合成及其在卷烟中的应用

为了提高卷烟主流烟气中维生素E(VE)释放量,改善卷烟口味,以VE和丁二酸酐为原料合成了VE丁二酸单酯,进行了HPLC纯度分析和1H NMR,13C NMR和EI-MS结构确证,并对添加了合成产物的卷烟进行了烟气分析和感官评吸试验.结果表明:①合成产物为目标产物——VE丁二酸单酯,纯度达98％;②添加VE丁二酸单酯的卷...     

Cell-Permeable Succinate Rescues Mitochondrial Respiration in Cellular Models of Statin Toxicity

Statins are the cornerstone of lipid-lowering therapy. Although generally well tolerated, statin-associated muscle symptoms (SAMS) represent the main reason for treatment discontinuation. Mitochondrial dysfunction of complex I has been implicated in the pathophysiology of SAMS. The present study proposed to assess the concentration-dependent ex vivo effects of three statins on mitochondrial respiration in viable human platelets and to investigate whether a cell-permeable prodrug of succinate (complex II substrate) can compensate for statin-induced mitochondrial dysfunction. Mitochondrial respiration was assessed by high-resolution respirometry in human platelets, acutely exposed to statins in the presence/absence of the prodrug NV118. Statins concentration-dependently inhibited mitochondrial respiration in both intact and permeabilized cells. Further, statins caused an increase in non-ATP generating oxygen consumption (uncoupling), severely limiting the OXPHOS coupling efficiency, a measure of the ATP generating capacity. Cerivastatin (commercially withdrawn due to muscle toxicity) displayed a similar inhibitory capacity compared with the widely prescribed and tolerable atorvastatin, but did not elicit direct complex I inhibition. NV118 increased succinate-supported mitochondrial oxygen consumption in atorvastatin/cerivastatin-exposed platelets leading to normalization of coupled (ATP generating) respiration. The results acquired in isolated human platelets were validated in a limited set of experiments using atorvastatin in HepG2 cells, reinforcing the generalizability of the findings.     

十六醇琥珀酸单酯磺酸钠的合成及复配研究

采用复合酸催化剂及正交实验法对十六醇琥珀酸单酯磺酸钠（MS16）的合成条件进行了优化，测定了其表面活性及应用性能，并将MS16与非离子表面活性剂进行了复配研究。     

Synthesis of new polyesters with methacrylate pendant groups

Summary A catalytic process for synthesis of new polyesters with methacrylate pendant groups is presented. Thus, zinc succinate catalyzed reaction of succinic anhydride with glycidyl methacrylate (GMA) in dimethoxyethane gives linear oligoesters with low molecular weights (1380-2400 Da). The polyester formation takes place via simultaneous ring opening of the cyclic anhydride and oxirane units. GMA component can be partially replaced with cyclohexeneoxide to obtain polyesters with methacrylate pendant groups in various percentages. Nearly colorless waxy polymers are obtained in excellent yields (69–97%) within 48–60 h. at 90 °C. In the study structure of the polymers have been elucidated by conventional spectroscopic techniques and photo-crosslinking of ability of their thin films have been tested by monitoring intensity of methacrylate double bonds, using IR-spectrometry methodology.     

Cover Picture: Macromol. Mater. Eng. 8/2005

Summary: Poly(butylene succinate‐co‐adipate) (PBSA) and organically modified montmorillonite (OMMT) nanocomposites of three different compositions were prepared by melt‐extrusion in a batch mixer. The structure of the nanocomposites was studied using X‐ray diffraction (XRD) and transmission electron microscopy (TEM) that revealed a coexistence of exfoliated and intercalated silicate layers dispersed in the PBSA matrix, regardless of the silicate loading. The degree of crystallinity of PBSA decreases with the addition of OMMT platelets. Dynamic mechanical analysis revealed remarkable increase in flexural storage modulus when compared with that of neat PBSA. Tensile property measurements exhibit substantial increase in stiffness with simultaneous increase in elongation at break of nanocomposites as compared to that of neat PBSA. The effect of clay loading on the melt‐state linear viscoelastic behavior of mixed intercalated/exfoliated nanocomposites was also investigated.

Elongation at break of compression molded annealed samples of neat PBSA and various PBSACNs.     

Reviewing Rare Earth Succinate Frameworks from the Reticular Chemistry Point of View: Structures,Nets, Catalytic and Photoluminescence Applications

The intense development that Metal-Organic Frameworks have experienced along the last two decades, reflects the interest on these compounds as a new generation of multifunctional materials with diverse applications. The first works of Prof. Omar Yaghi devoted to obtain open frameworks by combining rigid aromatic linkers and a variety of metal centers, encouraged the creativity of the scientific community to designcoordination polymers employing aliphatic ligands as multitopic building blocks . Here, a revision of the literature dedicated to rare earth coordination networks mainly based in succinate ligand and derivatives is performed. A structural analysis of 2D and 3D frameworks based on rare earth elements and succinate, was carried out considering their inner connectivities and topologies with focus on those compounds with potential photoluminescent and catalytic technological applications. Thus, a variety of optical behaviours regarding the emission mechanisms, colours, lifetimes, quantum yields as well as chemical/thermal sensing properties are presented and compared with related phases found in literature. The catalytic performance of several rare earth-succinates in three important reactions is discussed in terms of their acidity, dimensionality and available active centers towards the formation of the desired products analysing parameters such as selectivity, yields and TOFs.