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.     

十二烯基琥珀酸单麦芽糖酯的合成研究及表征

将溶于一定量有机溶剂的十二烯基琥珀酸酐滴加入麦芽糖碱性水溶液中反应得十二烯基琥珀酸单麦芽糖酯。通过考察原料配比、酸酐溶剂、酸酐滴加速度、反应时间等因素对十二烯基琥珀酸单麦芽糖酯产率的影响,确定了最佳反应条件:原料配比麦芽糖∶酸酐(物质的量比)为4∶1,酸酐溶剂为丙酮,酸酐滴加1 h,在35℃条件下反应6 h,十二烯基琥珀酸单麦芽糖酯的产率为83.1%。当十二烯基琥珀酸单麦芽糖酯水溶液的质量浓度为1.35 mg/mL时,产物的表面张力约为36.64×10-3 N/m。     

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.     

四针状ZnO晶须改性对ZnO/聚丁二酸丁二醇酯复合材料性能的影响

以四针状ZnO晶须（T-ZnO_W）为填料,经过表面处理与聚丁二酸丁二醇酯（PBS）复合,采用熔融共混法制备了T-ZnOw/PBS复合材料。利用FTIR表征表面改性T-ZnO_W的结构,利用SEM观察改性T-ZnO_W和T-ZnO_W/PBS复合材料的形貌,利用XRD分析改性T-ZnO_W和复合材料的结晶性能,利用TG和DSC分析复合材料的热稳定性,利用拉伸试验研究复合材料的力学性能。研究结果表明：聚乙二醇2000（PEG2000）（P）、硬脂酸（S）和硅烷偶联剂（KH560）（K）三种不同改性剂中,硬脂酸对T-ZnO_W的改性效果最佳。经硬脂酸改性T-ZnO_W（ST-ZnO_W）,表面负载有机活性基团,表面粗糙度增加且与纯PBS之间界面结合力增强,使ST-ZnO_W/PBS复合材料的热稳定性和力学性能明显得到改善。热分解过程中质量损失10%的温度（T_d-10%）和最大热分解温度（T_d-max）较纯PBS分别提高了37.7℃和35.3℃;拉伸强度、断裂伸长率和弹性模量分别提高了17.7%、140.5%和95.4%。     

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。     

降解塑料PBS／农药缓释微胶囊的制备与表征

以可生物降解的聚丁二酸丁二醇酯（PBs）为载体，通过乳化-溶剂挥发法制备了包覆毒死蜱的农药缓释微胶囊。通过扫描电镜、透射电镜、激光粒度分析仪等研究了不同农药／PBS投料比对微胶囊形貌的影响。用紫外／可见分光光度计评价毒死蜱从微胶囊中释放的行为，并通过凝胶渗透色谱仪表征了PBS壁材相对分子质量变化。结果表明，当投料比为3：1时，所得产品平均粒径为10μm，为包覆良好的基质型结构，可以实现约1000h的长效缓释。缓释过程中，渗透扩散释放为主要模式。