摘要
以尿素和聚酰胺为尼龙12(PA12)的氢键桥联剂,以苯甲酰肼和十八烷基胺为氢键抑制剂,分别考察了两类氢键调控剂及其调控能力与加工温度的关系,以及熔融加工剪切对PA12结晶行为的影响。结果表明,经历熔融加工过程、加入1.0%(质量分数,下同)尿素和2.0%聚酰胺氢均可使PA12的峰值结晶温度向高温移动8~9℃,结晶峰半高宽(FWHM)减小235%~239%;氢键桥联剂使结晶焓增加11.0 J/g左右,熔融加工过程使结晶焓增加3.4 J/g,表明加工剪切和氢键桥联剂均显著地促进了PA12结晶。相比之下,0.5~1.5份苯甲酰肼或十八烷基胺均使峰值结晶温度稍移向低温,结晶焓降低2 J/g左右,FWHM加宽9.7%~13.4%,表明苯甲酰肼和十八烷基胺抑制了PA12结晶。良好的熔体流变性能可明显促进氢键桥联剂作用的发挥,而氢键抑制剂作用与熔体流变性能的关系甚微。
In this paper,the effects of two types of hydrogen bond modulating additives and melt processing shear on the crystallization behavior of nylon 12(PA12)were investigated by using urea and low molecular weight polyamide(PA)as hydrogen bond bridging additives and benzoyl hydrazine and octadecyl amine as hydrogen bonding inhibitors for PA12,respectively.The results showed that undergoing melt processing,addition of 1.0 wt%urea and 2.0 wt%low molecular weight PA both shifted the peak crystallization temperature of PA12 towards higher temperatures 8~9℃and reduced the crystallization peak width at half height(FWHM)by 235%~239%;hydrogen bonding additives increased the enthalpy of crystallization by about 11.0 J/g,whereas the melt processing increased the enthalpy of crystallization by 3.4 J/g.This suggests that both processing shear and the hydrogen bonding additives significantly promoted PA12 crystallization.In contrast,either 0.5~1.5 phr benzoylhydrazine or octadecylamine shifted the peak crystallization temperature slightly to lower temperatures,with a decrease in the enthalpy of crystallization of about 2 J/g and a broadening of the FWHM of 9.7%~13.4%.It was shown that benzoylhydrazine and octadecylamine inhibited PA12 crystallization.Favorable melt rheology significantly promotes the effect of hydrogen bonding aids,whereas the role of hydrogen bonding inhibitors has little relationship with melt rheology.
作者
张景阳
孙成
付琳
薛志荣
扈健
薛美玲
ZhANG Jingyang;SUN Cheng;FU Lin;XUE Zhirong;HU Jian;XUE Meiling(Qingdao University of Science and Technology,School of Polymer Science and Engineering,Qingdao 266042,China)
出处
《弹性体》
CAS
2024年第4期52-57,共6页
China Elastomerics
关键词
尼龙12
结晶行为
氢键桥联剂
氢键抑制剂
nylon 12
crystallization behavior
hydrogen bonding additive
hydrogen bonding inhibitor
