研究的目的是合成具有一定分子量的两亲性磁性PEG5k-PCL4k嵌段共聚物复合微球胶束溶液。首先利用溶剂挥发法制备PEG-PCL嵌段共聚物胶束溶液,然后将Fe3O4纳米颗粒加入到胶束溶液中,制备了两亲性磁性PEG-PCL嵌段共聚物复合颗粒,最后采用XR...研究的目的是合成具有一定分子量的两亲性磁性PEG5k-PCL4k嵌段共聚物复合微球胶束溶液。首先利用溶剂挥发法制备PEG-PCL嵌段共聚物胶束溶液,然后将Fe3O4纳米颗粒加入到胶束溶液中,制备了两亲性磁性PEG-PCL嵌段共聚物复合颗粒,最后采用XRD、FTIR、TEM、1 H NMR及饱和磁化强度对磁性共聚物颗粒的物相、表面结构、微观结构及磁学性能进行了表征。结果表明:所制备的共聚物复合颗粒具有纳米结构、两亲性性能、磁学性能,同时1 H NMR核磁共振能证实了PEG-PCL两嵌段共聚物的组分及聚合单体的比例。展开更多
Phase change materials(PCMs)are promising thermal energy storage materials due to their high specific latent heat.Conventional PCMs typically exploit the solid–liquid(s–l)transition.However,leakage and leaching are ...Phase change materials(PCMs)are promising thermal energy storage materials due to their high specific latent heat.Conventional PCMs typically exploit the solid–liquid(s–l)transition.However,leakage and leaching are common issues for solid–liquid PCMs,which have to be addressed before usage in practical applications.In contrast,solid–solid(s–s)PCMs would naturally overcome these issues due to their inherent form stability and homogeneity.In this study,we report a new type of s–s PCM based on chemically linked polyethylene glycol(PEG,the PCM portion)with polylactic acid(PLA,the support portion)in the form of a block co‐polymer.Solid‐solid latent heat of up to 56 J/g could be achieved,with melting points of between 44°C and 55°C.For comparison,PEG was physically mixed into a PLA matrix to form a PEG:PLA composite.However,the composite material saw leakage of up to 9%upon heating,with a corresponding loss in thermal storage capacity.In contrast,the mPEG/PLA block co‐polymers were found to be completely homogeneous and thermally stable even when heated above its phase transition temperature,with no observable leakage,demonstrating the superiority of chemical linking strategies in ensuring form stability.展开更多
文摘研究的目的是合成具有一定分子量的两亲性磁性PEG5k-PCL4k嵌段共聚物复合微球胶束溶液。首先利用溶剂挥发法制备PEG-PCL嵌段共聚物胶束溶液,然后将Fe3O4纳米颗粒加入到胶束溶液中,制备了两亲性磁性PEG-PCL嵌段共聚物复合颗粒,最后采用XRD、FTIR、TEM、1 H NMR及饱和磁化强度对磁性共聚物颗粒的物相、表面结构、微观结构及磁学性能进行了表征。结果表明:所制备的共聚物复合颗粒具有纳米结构、两亲性性能、磁学性能,同时1 H NMR核磁共振能证实了PEG-PCL两嵌段共聚物的组分及聚合单体的比例。
基金Science and Engineering Research Council,Grant/Award Number:GAP/2019/00314。
文摘Phase change materials(PCMs)are promising thermal energy storage materials due to their high specific latent heat.Conventional PCMs typically exploit the solid–liquid(s–l)transition.However,leakage and leaching are common issues for solid–liquid PCMs,which have to be addressed before usage in practical applications.In contrast,solid–solid(s–s)PCMs would naturally overcome these issues due to their inherent form stability and homogeneity.In this study,we report a new type of s–s PCM based on chemically linked polyethylene glycol(PEG,the PCM portion)with polylactic acid(PLA,the support portion)in the form of a block co‐polymer.Solid‐solid latent heat of up to 56 J/g could be achieved,with melting points of between 44°C and 55°C.For comparison,PEG was physically mixed into a PLA matrix to form a PEG:PLA composite.However,the composite material saw leakage of up to 9%upon heating,with a corresponding loss in thermal storage capacity.In contrast,the mPEG/PLA block co‐polymers were found to be completely homogeneous and thermally stable even when heated above its phase transition temperature,with no observable leakage,demonstrating the superiority of chemical linking strategies in ensuring form stability.
