液体天然橡胶对湿法混炼制备白炭黑/天然橡胶复合材料界面相互作用的影响  

Effect of liquid natural rubber on interfacial interactions of SiO_2/NR composites prepared by wet mixing method

作　　者：何凡 李文朋 游建华 袁天元 杨晓红 廖双泉 

机构地区：[1]海南大学材料与化工学院热带岛屿资源先进材料教育部重点实验室,海口570228

出　　处：《复合材料学报》2018年第1期185-191,共7页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(51363006);公益性行业(农业)科研专项经费项目(201403066);海南省自然科学基金(20165183;214021);海南省重大科技计划(ZDKJ2016020-02)

摘　　要：采用液体天然橡胶(LNR)作为增容剂,通过湿法混炼工艺制备白炭黑/天然橡胶(SiO2/NR)复合材料。利用SEM、橡胶加工分析仪(RPA)、差示扫描量热分析仪(DSC)、溶胀法和核磁共振交联密度仪分别对改性前后SiO2/NR复合材料的界面形态、Payne效应、玻璃化转变温度(Tg)、结合胶含量及交联密度进行分析,研究LNR对NR与SiO2相互作用的影响。结果表明,采用LNR改性后,SiO2/NR复合材料中SiO2与NR结合紧密,两相界面变得模糊,断面表现为韧性断裂。一定SiO2用量下,SiO2/NR复合材料Payne效应明显减弱。当SiO2与NR质量比为60∶100时,玻璃化转变温度(Tg)由-59.57℃提高到-56.61℃,结合胶含量由40.24%增加到44.02%。Lorenz-Park方程定量计算表明,经LNR改性后,SiO2/NR复合材料界面相互作用增强。核磁共振测试结果表明,改性后,SiO2/NR复合材料交联密度增加,横向松弛时间(T2)减小,SiO2与NR质量比分别为30∶100、50∶100和70∶100时,T2分别缩短4.20ms、5.84ms和7.86ms,SiO2与NR相互作用增强,NR分子链运动受限。LNR具有较好的增容效果,经LNR改性的SiO2/NR复合材料界面相互作用增强。The silica/natural rubber（SiO2/NR）composites was prepared by wet mixing technology with liquid natural rubber（LNR）as compatibilizer.The tensile fracture surface morphology,Payne effect,glass transition temperature（Tg）,bound rubber contents and crosslink density of SiO2/NR composites were characterized by SEM,rubber processing analyzer（RPA）,differential scanning calorimetry（DSC）,swelling method and nuclear magnetic resonance instrument.The effect of LNR on the rubber-filler interaction was also investigated.The results show that SiO2 particles are tightly encompassed by NR and fracture surfaces appear toughness fracture in the presence of LNR.The Payne effect of SiO2/NR composites is obviously decreased under certain amount of silica SiO2.Tgis observed from-59.57℃to-56.61℃and bound rubber content is observed from 40.24%to 44.02% when the mass ratio of SiO2 to NR is 60：100.The interfacial interaction of SiO2/NR composites quantitatively evaluated by Lorenz-Park equation is strengthened in the presence of LNR.Nuclear magnetic resonance test shows that the crosslink density has great enhancements and transverse relaxation time（T2）decrease for modified SiO2/NR composites,T2 decreases 4.20 ms,5.84 ms and 7.86 ms when the mass ratio of SiO2 to NR are 30∶100,50∶100 and70∶100,respectively,which can be ascribed to the stronger filler-rubber interfacial interaction that limites the extensibility of NR chains with incorporation of LNR.It is revealed that LNR has good compatibility,which contributes to strengthening interfacial interaction of SiO2/NR composites.

关 键 词：天然橡胶 液体天然橡胶 湿法混炼 白炭黑 复合材料 界面相互作用 

分 类 号：TQ332.5[化学工程—橡胶工业]