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摘要
采用癸二胺、对苯二甲酸和间苯二甲酸为原料,通过熔融缩聚法制备了耐高温共聚酰胺10T/10I(PA10T/10I),并通过差示扫描量热仪对不同PA10I单元含量的PA10T/10I的非等温结晶动力学进行了研究。结果表明:随着PA10I单元含量的增加,在相同降温速率下,PA10T/10I聚合物结晶峰温度降低,相对结晶度增大;在较低的降温速率下,结晶时间缩短,但降温速率较高时,结晶时间又有所延长。通过Jeziorny法处理发现PA10T/10I成核可能同时包含均相成核和异相成核,PA10I单元质量分数超过5%后,结晶前期晶体增长速率较快,后期晶体生长空间缩小,生长向低维转变;通过Mo法处理发现随着PA10I单元含量增加,PA10T/10I结晶速率加快,可在较低的降温速率下获得较高的相对结晶度;通过Kissinger理论得到PA10T/10I非等温结晶活化能绝对值随着PA10I单元含量增加逐渐减小,结晶变得较为容易。
Abstract
High temperature copolyamide PA10T/10I was prepared by melt polycondensation method using decanediamine,terephthalic acid and isophthalic acid as raw materials,and isothermal crystallization kinetics of PA10T/10I with different ratios were obtained by differential scanning calorimetry (DSC).The results shown that with the increase of the proportion of 10I units,the crystallization peak temperature of PA10T/10I decreased gradually,the crystallization time decreased,and the relative crystallinity increased.As the rate of cooling increased,the initial crystallization temperature of PA10T/10I decreased,and the time required for the polymer to reach the same relative crystallinity decreased.The nucleation of PA10T/10I may contain homogeneous nucleation and heterogeneous nucleation by Jeziorny method.After the proportion of 10I units exceeded 5%,crystal growth rate was faster in the early stage of crystallization,and the crystal growth space was reduced and the growth was transform to low dimensional;by the Mo method,it was found that with the increase of relative crystallinity,F(T) increased gradually,and the rate of cooling increased.As the proportion of 10I units increased,the value of α gradually increased within a certain range.Kissinger theory obtained that the absolute value of its non-isothermal crystallization activation energy decreased with the increase of 10I proportion,and the crystallization rate increased.
关键词
PA10T/10I
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非等温结晶动力学
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差示扫描量热
Key words
PA10T/10I
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non-isothermal crystallization kinetics
/
differential scanning calorimetry
熔融缩聚耐高温PA10T/10I的非等温结晶动力学研究[J].
化工新型材料, 2020, 48(6): 157-161 DOI:
[1] Zhang Qi,Luo Xiaolin,Zhang Meilin,et al.Mechanical and thermomechanical properties of nylon6T/66/PPS blends[J].Materials Science Forum,2015,3767(1630):503-508.
[2] Wang Yu,Kang Hongliang,Liu Ruigang,et al.Crystallization of polyamide 56/polyamide 66 blends:non-isothermal crystallization kinetics[J].Applied Polymer Science,2018,135(26):1-13.
[3] Sayedahmed E Y,Bakay R,Shrive N G.Bond strength of FRP laminates to concrete:state-of-the-art review[J].Electronic Journal of Structural Engineering,2009,9:45-61.
[4] 王玉东,付鹏,李晓光,等.尼龙612的等温结晶动力学[J].高分子材料科学与工程,2011,27(2):103-106.
[5] Li H,Guan M,Cheng F,et al.Isothermal and non-isothermal crystallization kinetics of poly(3-hydroxybutyrate)[J].Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering,2012,28(8):60-63.
[6] Song J,Ren M,Chen Q,et al.Isothermal and nonisothermal crystallization kinetics of irradiated nylon 1212[J].Journal of Polymer Science Part B Polymer Physics,2010,43(17):2326-2333.
[7] 王忠强,胡国胜,张静婷,等.熔融聚合耐高温聚酰胺的非等温结晶动力学研究[J]材料导报,2017,31(6):161-170.
[8] Jape S P,Deshpande D.Nonisothermal crystallization kinetics of nylon 66/LCP blends[J].Thermochimica Acta,2017,655:1-12.
[9] 师文博,胡国胜,张静婷,等.半芳香族耐高温PA10T/1010的非等温结晶动力学研究[J].工程塑料应用,2016,44(3):100-104.
[10] Mandelkern L.Crystallization of polymers[M].New York:Mc Graw-hill Press,1964,254-257.
[11] Jeziorny A.Parameters characterizing the kinetics of the non-isothermal cystallization of poly(ethylene tereph-tha-late) determined by D.S.C[J].Polymer,1978,19(10):1142-1144.
[12] 张声春,韩冰,张春祥,等.半芳香共聚尼龙6T/6的非等温结晶动力学研究[J]塑料工业,2013,41(11):91-94.
[13] 王忠强,胡国胜,周秀苗.原位增容PA6/PE-HD共混物的非等温结晶动力学研究[J]中国塑料,2011,25(2):52-59.
[14] 莫志深.一种研究聚合物非等温结晶动力学的方法[J].高分子学报,2008(7):656-661.
[15] Wang Zhongqiang,Hu Guosheng,Zhang Jingting,et al.Non-isothermal crystallization kinetics of Nylon 10T and Nylon 10T/1010 copolymers:effect of sebacic acid as a third comonomer[J].Chinese Journal of Chemical Engineering,2017,25(7):963-970.
[16] Kissinger H E,Chem A.Reaction kinetics in differential thermal analysis[J].Analytical Chemistry,2002,29(11):1702-1706.
