PA66 RA-1004基础创新塑料--When nylon-66 is thermally decomposed, it first shows that the main chain cracks, resulting in the decrease of molecular weight and melt viscosity; In further degradation, the viscosity of the melt is increased by the three dimensional structure, and finally the gel becomes insoluble and insoluble. The mechanism has not been fully clarified, but it is believed that the main reason is the essence of nylon-66, which is closely related to the easy formation of Cyclopentanone derivatives by adipic acid residues. In the inert gas atmosphere, nylon-66 can maintain stability at 300 ℃ for a short time, but after a long time (such as 290 ℃ for 5 hours), it can be seen that it decomposes obviously to produce ammonia and carbon dioxide. In the absence of oxygen, the decomposition products are cyano (- CN) and vinyl (- CH = CH2). In the presence of oxygen and water, nylon-66 showed an obvious decomposition tendency at 200 ℃. Nylon-66 is stable to room temperature water and boiling water, but it will hydrolyze at high temperature, especially in the molten state.

当尼龙-66发生热分解时，首先表现为主链开裂引起分子量、熔体粘度降低；进一步降解时，由三维结构化引起熔体粘度上升而Zui终变成凝胶，成为不溶不熔物。其机理尚未完全阐明，但相信主要原因是尼龙-66本质造成的，与己二酸残基容易形成环戊酮衍生物密切相关。 在惰性气体氛围中，尼龙-66可以在300℃保持短时间的稳定性，但时间长后（如290℃5小时）就可看出明显的分解，产生氨和二氧化碳等。在无氧的条件下，其分解产物为氰基(-CN)和乙烯基(-CH=CH2)。 在有氧和水等存在时，尼龙-66在200℃就显示出明显的分解倾向。在有氧存在时，加热还会引起分子链之间的交联. 尼龙-66对室温水和沸水是稳定的，但在高温尤其是在熔融状态下则会发生水解。

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我们现经营以下品牌PA66: