| 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 |
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| 引用本文： | 何凡,李文朋,游建华,袁天元,杨晓红,廖双泉.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[J].复合材料学报,2018,35(1):185-191. |
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| 作者姓名： | 何凡 李文朋 游建华 袁天元 杨晓红 廖双泉 |
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| 作者单位： | 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 |
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| 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4.20 ms、5.84 ms和7.86 ms，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。
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| 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 |
| 收稿时间： | 2017-01-13 |
Effect of liquid natural rubber on interfacial interactions of SiO2/NR composites prepared by wet mixing method |
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| HE Fan,LI Wenpeng,YOU Jianhua,YUAN Tianyuan,YANG Xiaohong,LIAO Shuangquan.Effect of liquid natural rubber on interfacial interactions of SiO2/NR composites prepared by wet mixing method[J].Acta Materiae Compositae Sinica,2018,35(1):185-191. |
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| Authors: | HE Fan LI Wenpeng YOU Jianhua YUAN Tianyuan YANG Xiaohong LIAO Shuangquan |
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| Affiliation: | Key Laboratory of Ministry of Education for Advanced Materials of Tropical Island Resources, College of Materials and Chemical Engineering, Hainan University, Haikou 570228, China |
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| Abstract: | 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. Tg is 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 and 70:100, 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. |
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| Keywords: | natural rubber liquid natural rubber wet mixing silica composite interfacial interaction |
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