共查询到19条相似文献,搜索用时 93 毫秒
1.
2.
不同成核剂成核聚丙烯的结晶行为与力学性能 总被引:12,自引:0,他引:12
制备了6种成核剂成核聚丙烯(PP)母料研究了成核母料和成核母料/PP的结晶,熔融行为,力学性能和透明性等物理性能,不同成核在成核母材料和成核母料/PP中对PP的结晶与熔融行为以及性能有不同的作用,观察到成核型A成核PP具有较高的结晶温度与综合性能,而成核剂B成核PP的透明性较好。 相似文献
3.
研究了成核剂对PP/POE共混物的力学性能和结晶行为的影响。加入成核剂提高了共混物的冲击强度和弯曲模量,使PP/POE共混物的刚性韧性得到了很好的平衡,同时,成核剂提高了PP/POE共混物的结晶速率和结晶温度,减小了球晶的尺寸,有利于力学性能的提高和缩短加工时间。 相似文献
4.
采用熔融共混法,用成核剂对聚乳酸(PLA)进行成核改性.通过差示扫描量热仪(DSC)、X射线衍射仪(XRD)、偏光显微镜(PLM)及力学性能和热变形温度(HDT)等测试,研究成核剂对PLA的结晶、力学和耐热性能的影响.结果表明:改性PLA的结晶温度和结晶度提高,晶体尺寸减小,且PLA的晶型结构没有改变;改性PLA的拉伸强度、拉伸屈服强度和刚性降低,韧性有所提高;将注射成型的改性PLA样条进行退火处理后,耐热性有很大提高. 相似文献
5.
6.
7.
8.
研究了成核剂有机山梨醇类、取代芳基磷酸酯盐和有机羟基铝盐三种不同成核剂对阻燃聚丙烯(PP)改性塑料力学性能影响,并通过差示扫描量热仪(DSC)表征成核剂对阻燃改性PP结晶的影响.结果表明成核剂有利于改善阻燃PP力学性能,提高PP的结晶峰温度和晶粒均匀度,其中取代芳基磷酸酯盐类成核剂的效果最好. 相似文献
9.
10.
β成核剂含量对PP力学性能和结晶行为影响 总被引:2,自引:0,他引:2
摘要:研究了β成核剂含量对聚丙烯(PP)结构和性能的影响,用偏光显微镜和广角X射线衍射法(WAXD)对PP结晶形态和结晶行为进行了研究.结果表明,当β成核剂的含量在0.05份时,冲击强度达到最大值,而拉伸强度、弯曲强度、模量、维卡软化温度等达到最小值;当β成核剂含量为0.05份以下时,随着β成核剂含量增加,PP中β晶结晶度大幅度上升,同时α晶结晶度大幅度下降;增加β成核剂用量至大于0.10份时,β晶结晶度略为下降,而α晶结晶度上升,但总结晶度随着β成核剂含量增加呈现上升趋势.用差示扫描量热法(DSC)对纯PP和β成核剂-PP进行比较,发现β成核剂对PP的结晶有影响. 相似文献
11.
成核剂对增韧聚丙烯力学性能的影响 总被引:11,自引:0,他引:11
主要研究成核剂种类及用量对乙烯-辛烯共聚物(POE)增韧聚丙烯(PP)力学性能的影响。研究表明:随着成核剂NA1的加入,PP/POE共混物的透明性、冲击强度、弯曲强度、拉伸屈服强度均明显提高,研制的改性PP的透明性、韧性和刚性得到了平衡。 相似文献
12.
Liang Shihui 《Polymer-Plastics Technology and Engineering》2013,52(3):439-445
Two kinds of modified abietates, cocrystals of dehydroabietic acid with sodium dehydroabietate and tetrahydroabietic acid with sodium tetrahydroabietate, were prepared, respectively. The properties and crystallization behavior of polypropylene (PP) with the modified abietate cocrystals as nucleating agents were investigated by the measurement of mechanical properties and heat distortion temperature (HDT), testing of differential scanning calorimetry (DSC), X-ray diffraction (XRD), and polarizing light microscopy (PLM) observation. The results show that the heat distortion temperature (HDT), transmittance, crystallizing point, the degree of crystallinity, and mechanical properties, especially the flexural strength and modulus of PP are enhanced obviously, but the size of spherulites measured by polarizing optical microscopy decrease, by adding modified abietate cocrystals. By adding the modified abietates, the typical α-form monoclinic structure of PP was formed, which was proved by the results of X-ray diffraction. It is concluded that the modified abietates can be used as effective nucleating agents for PP. 相似文献
13.
14.
In this research, the effects of different kinds of nucleating agents on the crystallization and mechanical properties of polyoxymethylene (POM) were studied, including inorganic, organic, and polymer nucleating agents and their compounds. These properties showed that nanoCaCO3, sorbitol derivative TMB-5, polyamide PA-4, and compound C-1/polyamide (PA)-4 can make spherulites of POM finer and more perfect, and effectively improve its notched impact toughness, in which the compound C-1/PA-4 displayed more remarkable nucleation effect. The study on the nonisothermal crystallization of POM showed that the crystallization temperature and crystallization growth rate of POM increased when C-1/PA-4 was added. The isothermal crystallization kinetics were also analyzed by the Avrami equation. The addition of C-1/PA-4 can increase the values of the Avrami exponent (n) and crystallization rate constant (k), and reduce the half-time of isothermal crystallization, t1/2, and the time corresponding to the maximum rate of crystallization, tP, indicating its remarkable nucleating effect on POM. 相似文献
15.
16.
17.
18.
复合成核剂对PBT结晶行为的影响 总被引:1,自引:0,他引:1
采用熔融共混法制备了聚对苯二甲酸丁二醇酯(PBT)和成核剂二苄山梨醇(DBS)或苯甲酸钠(SB)的共混物,通过差示扫描量热仪(DSC)、X射线衍射仪(XRD)、偏光显微镜(PLM)分析了各成核剂对PBT的结晶行为的影响,结果表明:添加任何一种成核剂均能明显改善PBT的结晶行为,即加快结晶速度、提高结晶度、细化晶体及完善晶体形态;其中复合成核剂要明显优于单一成核剂,复合成核剂中SB的影响程度要大于DBS。还采用热重分析(TGA)仪对体系的热性能进行了研究,发现成核剂的加入并未降低体系的热性能。 相似文献