Abstract The chlorotrifluoroethylene (CTFE) content in vinylidene fluoride (VDF)-CTFE copolymers greatly influences the chemical and physical properties and ultimately determines the application. The copolymer known as FK-800 has a VDF:CTFE ratio of ∼1:3 and is used almost exclusively as the binder in the insensitive high explosive (HE) formulation PBX 9502. Due to the dangerous nature of HE work and the effect CTFE content variations have, the ability to quickly and easily quantify CTFE content is of interest. Two techniques, attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR) and time to peak crystallization measured by heat flow calorimetry, were evaluated as potential means for quantifying CTFE content. Based on the certificate of analyses (COAs), FK-800 lots with varied CTFE content encompassing the range historically used in HE applications were used as standards for both methodologies. For FTIR, a linear regression was performed on the peak area of the C-Cl IR stretch and the CTFE content; the methodology was then demonstrated on four samples, two lots of unadulterated material and material recovered from two HE samples. The calculated CTFE content and COAs were in good agreement for all four samples. Heat flow calorimetry revealed the relationship between time to peak crystallization and CTFE content was best fit by a power regression; the methodology was then tested on two different FK-800 lots. Only one sample showed good agreement between the calculated CTFE content and the COA. This discrepancy indicates the method developed is not suitable for quantifying CTFE, but provides valuable insight regarding the crystallization behavior of VDF-CTFE copolymers.

中文翻译：

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使用 ATR-FTIR 和结晶峰值时间定量 FK-800 中的 CTFE 含量

摘要 偏二氟乙烯(VDF)-CTFE共聚物中三氟氯乙烯(CTFE)的含量对其化学和物理性质影响很大，最终决定了其应用。被称为 FK-800 的共聚物的 VDF:CTFE 比约为 1:3，几乎专门用作不敏感高爆炸药 (HE) 配方 PBX 9502 中的粘合剂。 由于 HE 工作的危险性质和 CTFE 的影响内容变化具有快速、轻松地量化 CTFE 内容的能力。两种技术，衰减全反射傅里叶变换红外光谱 (ATR-FTIR) 和通过热流量热法测量的结晶峰值时间，被评估为量化 CTFE 含量的潜在手段。根据分析证书 (COA)，具有不同 CTFE 含量的 FK-800 批次（涵盖 HE 应用中历史上使用的范围）被用作两种方法的标准。对于 FTIR，对 C-Cl IR 拉伸峰面积和 CTFE 含量进行线性回归；然后在四个样品、两批未掺杂材料和从两个 HE 样品中回收的材料上证明了该方法。所有四个样品的计算出的 CTFE 含量和 COA 都非常吻合。热流量热法揭示了结晶峰值时间与 CTFE 含量之间的关系最适合通过幂回归拟合；然后在两个不同的 FK-800 批次上测试了该方法。只有一个样品显示计算出的 CTFE 含量与 COA 之间具有良好的一致性。这种差异表明所开发的方法不适合量化 CTFE，