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首页> 外文期刊>Journal of Applied Polymer Science >Characterizaion, Properties, and Processing of LaRC PETI-5 as a High-Temperature Sizing Material. II. Thermal Characterization
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Characterizaion, Properties, and Processing of LaRC PETI-5 as a High-Temperature Sizing Material. II. Thermal Characterization

机译：LaRC PETI-5作为高温上浆材料的特性，性能和加工。二。热特性

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In this publication the glass transition,melting behavior,cure behavor,and thermal stability of LaRC PETI-5 have been extensively studied utilizing differential scanning calorimetry (DSC)and thermogravimetric analysis (TGA).The material used here was subjected to different thermal history (cumulative cure and incdividual cure)including an isothermal cure.The extent of cure for the partially cured resin was evaluated taking into account the residual solvent in the resin with the aid of a correction factor. The data show that the thermal history for the imidization reaction may influence the extent of cure for the partially cured LaRC PETI-5.The reaction of the Cident toC bonds in the phenvlethynyl groups located in the imide plolymer chain ends is completed to produce a fully cured LaRC PETI-5 within 1 h at 350deg C in air.The result is very consistent with the result obtained using Fourier Transform infrared (FT-IR) spectroscopy in the previous work. Tis study also demonstrates thayt no reaction takes place above 350deg C prior to degradation. LaRC PETI-5 with a molecular weight of 25000g/mol has excellent thermal stability up to 550deg C as long as it is fully imidized.The result of the isothermal stability suggests that this material may be used without significant loss of its integrity for extended periods of time below 450deg C.
机译：在本出版物中，使用差示扫描量热法（DSC）和热重分析（TGA）对LaRC PETI-5的玻璃化转变，熔融行为，固化行为和热稳定性进行了广泛的研究。此处使用的材料经历了不同的热历史（累积固化和单个固化），包括等温固化。借助校正因子，考虑到树脂中的残留溶剂，评估了部分固化树脂的固化程度。数据表明，酰亚胺化反应的热历史可能会影响部分固化的LaRC PETI-5的固化程度.Cident在酰亚胺多聚体链末端的苯乙炔基中的C键与C键的反应完成，以完全产生在350摄氏度的空气中在1小时内固化LaRC PETI-5。结果与先前工作中使用傅立叶变换红外（FT-IR）光谱获得的结果非常一致。该研究还表明，在降解之前，高于350°C不会发生任何反应。分子量为25000g / mol的LaRC PETI-5在完全被酰亚胺化的情况下，即使在550°C的高温下也具有优异的热稳定性。在450摄氏度以下的时间

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