在三元乙丙橡胶（EPDM）中混炼配入三羟甲基丙烷三甲基丙烯酸酯（TMPTMA）（0~5.66%）后,用60Coγ射线源辐照至选定剂量（0~150 k Gy）,研究了TMPTMA对辐射交联EPDM试样的交联密度、凝胶含量以及力学性能的影响,提出了EPDM添加TMPTMA的...在三元乙丙橡胶（EPDM）中混炼配入三羟甲基丙烷三甲基丙烯酸酯（TMPTMA）（0~5.66%）后,用60Coγ射线源辐照至选定剂量（0~150 k Gy）,研究了TMPTMA对辐射交联EPDM试样的交联密度、凝胶含量以及力学性能的影响,提出了EPDM添加TMPTMA的辐射交联反应模型。结果表明,TMPTMA可以有效促进EPDM中交联键的产生,辐照产物的交联密度与凝胶含量皆随TMPTMA用量增加而显著提高,但当TMPTMA含量超过2.98%时,凝胶含量的升高趋势平缓化。实验发现,过高的交联密度并不利于提高拉伸强度,添加1.96%TMPTMA的试样在10k Gy达到拉伸强度的极大值（27.6 MPa）,之后随剂量的增加而下降。展开更多
以甲基乙烯基硅橡胶为实验生胶,用1 Me V电子加速器为辐照源,在高压750 kV、束流10 mA的剂量率条件下,通过辐照交联制得不同敏化剂(TMPTMA)配比的硅橡胶。实验探究了硅橡胶辐射剂量以及敏化剂含量对其相关物理性能的影响。结果表明:对于...以甲基乙烯基硅橡胶为实验生胶,用1 Me V电子加速器为辐照源,在高压750 kV、束流10 mA的剂量率条件下,通过辐照交联制得不同敏化剂(TMPTMA)配比的硅橡胶。实验探究了硅橡胶辐射剂量以及敏化剂含量对其相关物理性能的影响。结果表明:对于3 mm厚的甲基乙烯基硅橡胶片,在敏化剂的加入量为3 phr、辐照剂量为80 k Gy时力学性是最好的。对于4 mm厚的甲基乙烯基硅橡胶片,在敏化剂的加入量为3 phr、辐照剂量为60 k Gy时力学性能是最好的。展开更多
Sodium metal batteries(SMBs)are widely regarded as the most promising candidate for the next generation of electrochemical energy storage devices.However,critical challenges of slow Na^(+)diffusion at room temperature...Sodium metal batteries(SMBs)are widely regarded as the most promising candidate for the next generation of electrochemical energy storage devices.However,critical challenges of slow Na^(+)diffusion at room temperature,unstable solid electrolyte interphase(SEI),and uncontrolled growth of sodium dendrites still hinder its practical applications.Herein,an organic-inorganic composite solid electrolyte(CSE),formed through in situ thermal polymerization of trimethylolpropane trimethacrylate(TMPTMA)and hexanediol diacrylate(HDDA)with an aluminum oxide(Al_(2)O_(3))filler,is developed to achieve high-performance SMBs.As demonstrated experimentally,the addition of the Al_(2)O_(3)filler effectively enhances the transport of Na^(+),resulting in a high ionic conductivity of 5.59×10^(-3)S cm^(-1)at 25℃.Furthermore,the solvation structures of Na^(+)are actively regulated to facilitate fast kinetics and the formation of stable inorganic-rich interface.The Na∥Na symmetrical cell maintains a low polarization voltage even after 1000 h,indicating the successful inhibition of sodium dendrite growth and achievement of uniform Na depositions.Benefiting from the design of the organic-inorganic CSE,the Na∥NVP cell demonstrates a capacity retention of 88%after 2000 cycles at 2 C,indicating superior cycling stability.The cleverly designed strategy creates opportunities to boost the development of CSEs for SMBs.展开更多
文摘在三元乙丙橡胶（EPDM）中混炼配入三羟甲基丙烷三甲基丙烯酸酯（TMPTMA）（0~5.66%）后,用60Coγ射线源辐照至选定剂量（0~150 k Gy）,研究了TMPTMA对辐射交联EPDM试样的交联密度、凝胶含量以及力学性能的影响,提出了EPDM添加TMPTMA的辐射交联反应模型。结果表明,TMPTMA可以有效促进EPDM中交联键的产生,辐照产物的交联密度与凝胶含量皆随TMPTMA用量增加而显著提高,但当TMPTMA含量超过2.98%时,凝胶含量的升高趋势平缓化。实验发现,过高的交联密度并不利于提高拉伸强度,添加1.96%TMPTMA的试样在10k Gy达到拉伸强度的极大值（27.6 MPa）,之后随剂量的增加而下降。
文摘以甲基乙烯基硅橡胶为实验生胶,用1 Me V电子加速器为辐照源,在高压750 kV、束流10 mA的剂量率条件下,通过辐照交联制得不同敏化剂(TMPTMA)配比的硅橡胶。实验探究了硅橡胶辐射剂量以及敏化剂含量对其相关物理性能的影响。结果表明:对于3 mm厚的甲基乙烯基硅橡胶片,在敏化剂的加入量为3 phr、辐照剂量为80 k Gy时力学性是最好的。对于4 mm厚的甲基乙烯基硅橡胶片,在敏化剂的加入量为3 phr、辐照剂量为60 k Gy时力学性能是最好的。
基金supported by the National Natural Science Foundation of China(22008053 and 52002111)the Natural Science Foundation of Hebei Province(B2021208061,B2022208006,and B2023208014)the Beijing Natural Science Foundation(Z200011).
文摘Sodium metal batteries(SMBs)are widely regarded as the most promising candidate for the next generation of electrochemical energy storage devices.However,critical challenges of slow Na^(+)diffusion at room temperature,unstable solid electrolyte interphase(SEI),and uncontrolled growth of sodium dendrites still hinder its practical applications.Herein,an organic-inorganic composite solid electrolyte(CSE),formed through in situ thermal polymerization of trimethylolpropane trimethacrylate(TMPTMA)and hexanediol diacrylate(HDDA)with an aluminum oxide(Al_(2)O_(3))filler,is developed to achieve high-performance SMBs.As demonstrated experimentally,the addition of the Al_(2)O_(3)filler effectively enhances the transport of Na^(+),resulting in a high ionic conductivity of 5.59×10^(-3)S cm^(-1)at 25℃.Furthermore,the solvation structures of Na^(+)are actively regulated to facilitate fast kinetics and the formation of stable inorganic-rich interface.The Na∥Na symmetrical cell maintains a low polarization voltage even after 1000 h,indicating the successful inhibition of sodium dendrite growth and achievement of uniform Na depositions.Benefiting from the design of the organic-inorganic CSE,the Na∥NVP cell demonstrates a capacity retention of 88%after 2000 cycles at 2 C,indicating superior cycling stability.The cleverly designed strategy creates opportunities to boost the development of CSEs for SMBs.
