艾绒质量是影响灸热疗效的关键因素,传统艾绒等级是以叶绒比作为评价方法,但缺乏科学数据。实验采用扫描电镜、Image Pro Plus、Van Soest法和同步热分析(TGA/DSC)表征(经粉碎机加工)不同叶绒比艾绒的燃烧差异的科学内涵。结果表明自然...艾绒质量是影响灸热疗效的关键因素,传统艾绒等级是以叶绒比作为评价方法,但缺乏科学数据。实验采用扫描电镜、Image Pro Plus、Van Soest法和同步热分析(TGA/DSC)表征(经粉碎机加工)不同叶绒比艾绒的燃烧差异的科学内涵。结果表明自然非腺毛、3∶1、5∶1、10∶1和15∶1不同叶绒比艾绒的非腺毛长度的中位数分别为542.46、303.24、291.18、220.69、170.61μm;随着叶绒比增加,艾绒的纤维素含量显著增加(P<0.05),燃烧参数(T_(i)、t_(i)、D_(i)、C、-R_(p)、-R_(v)、S、D_(b)、J_(总))均增大。相关性结果表明,艾绒的燃烧性能(T_(i)、-R_(v)、t_(i)、J_(2))与纤维素含量呈显著正相关;非腺毛长度1~200μm与J_(2)呈显著正相关;非腺毛长度200~600μm与J_(1)、T_(peak2)、T_(peak1)、-R_(v)呈显著正相关,与J_(总)、T_(b)、t_(b)呈显著负相关。叶绒比增大,艾绒中非腺毛变短、纤维素含量增加,更有利于提高着火性能、释放热量,燃烧更温和持久。“非腺毛-纤维素-TGA/DSC”量化评价方法科学揭示不同叶绒比艾绒的燃烧科学内涵,为不同叶绒比艾绒的质量评价方法建立提供了科学依据。展开更多
This work describes thermal decomposition behaviour of plastic bonded explosives(PBXs) based on mixture of 1,3,5,7-tetranitro-1,3,5,7-tetrazocane(HMX) and 2,4,6-triamino-1,3,5-trinitrobenzene(TATB)with Viton A as poly...This work describes thermal decomposition behaviour of plastic bonded explosives(PBXs) based on mixture of 1,3,5,7-tetranitro-1,3,5,7-tetrazocane(HMX) and 2,4,6-triamino-1,3,5-trinitrobenzene(TATB)with Viton A as polymer binder. Thermal decomposition of PBXs was undertaken by applying simultaneous thermal analysis(STA) and differential scanning calorimetry(DSC) to investigate influence of the HMX amount on thermal behavior and its kinetics. Thermogravimetric analysis(TGA) indicated that the thermal decomposition of PBXs based on mixture of HMX and TATB was occurred in a three-steps. The first step was mainly due to decomposition of HMX. The second step was ascribed due to decomposition of TATB, while the third step was occurred due to decomposition of the polymer matrices. The thermal decomposition % was increased with increasing HMX amount. The kinetics related to thermal decomposition were investigated under non-isothermal for a single heating rate measurement. The variation in the activation energy of PBXs based on mixture of HMX and TATB was observed with varying the HMX amount. The kinetics from the results of TGA data at various heating rates under non-isothermal conditions were also calculated by Flynn—Wall—Ozawa(FWO) and Kissinger-Akahira-Sunose(KAS)methods. The activation energies calculated by employing FWO method were very close to those obtained by KAS method. The mean activation energy calculated by FWO and KAS methods was also a good agreement with the activation energy obtained from single heating rate measurement in the first step decomposition.展开更多
文摘艾绒质量是影响灸热疗效的关键因素,传统艾绒等级是以叶绒比作为评价方法,但缺乏科学数据。实验采用扫描电镜、Image Pro Plus、Van Soest法和同步热分析(TGA/DSC)表征(经粉碎机加工)不同叶绒比艾绒的燃烧差异的科学内涵。结果表明自然非腺毛、3∶1、5∶1、10∶1和15∶1不同叶绒比艾绒的非腺毛长度的中位数分别为542.46、303.24、291.18、220.69、170.61μm;随着叶绒比增加,艾绒的纤维素含量显著增加(P<0.05),燃烧参数(T_(i)、t_(i)、D_(i)、C、-R_(p)、-R_(v)、S、D_(b)、J_(总))均增大。相关性结果表明,艾绒的燃烧性能(T_(i)、-R_(v)、t_(i)、J_(2))与纤维素含量呈显著正相关;非腺毛长度1~200μm与J_(2)呈显著正相关;非腺毛长度200~600μm与J_(1)、T_(peak2)、T_(peak1)、-R_(v)呈显著正相关,与J_(总)、T_(b)、t_(b)呈显著负相关。叶绒比增大,艾绒中非腺毛变短、纤维素含量增加,更有利于提高着火性能、释放热量,燃烧更温和持久。“非腺毛-纤维素-TGA/DSC”量化评价方法科学揭示不同叶绒比艾绒的燃烧科学内涵,为不同叶绒比艾绒的质量评价方法建立提供了科学依据。
基金DRDO(TBR-1251)for funding and awarding the Project
文摘This work describes thermal decomposition behaviour of plastic bonded explosives(PBXs) based on mixture of 1,3,5,7-tetranitro-1,3,5,7-tetrazocane(HMX) and 2,4,6-triamino-1,3,5-trinitrobenzene(TATB)with Viton A as polymer binder. Thermal decomposition of PBXs was undertaken by applying simultaneous thermal analysis(STA) and differential scanning calorimetry(DSC) to investigate influence of the HMX amount on thermal behavior and its kinetics. Thermogravimetric analysis(TGA) indicated that the thermal decomposition of PBXs based on mixture of HMX and TATB was occurred in a three-steps. The first step was mainly due to decomposition of HMX. The second step was ascribed due to decomposition of TATB, while the third step was occurred due to decomposition of the polymer matrices. The thermal decomposition % was increased with increasing HMX amount. The kinetics related to thermal decomposition were investigated under non-isothermal for a single heating rate measurement. The variation in the activation energy of PBXs based on mixture of HMX and TATB was observed with varying the HMX amount. The kinetics from the results of TGA data at various heating rates under non-isothermal conditions were also calculated by Flynn—Wall—Ozawa(FWO) and Kissinger-Akahira-Sunose(KAS)methods. The activation energies calculated by employing FWO method were very close to those obtained by KAS method. The mean activation energy calculated by FWO and KAS methods was also a good agreement with the activation energy obtained from single heating rate measurement in the first step decomposition.
