天然橡胶低温结晶性能分析
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摘要
天然橡胶作为一种绿色的自补强高分子材料,有着合成橡胶无法比拟的优点。已有大量关于天然橡胶应变诱导结晶研究的文献报道,而对天然橡胶低温结晶研究的文献报道较少,天然橡胶低温结晶的研究对耐低温天然橡胶制品的生产有着理论指导意义。本文采用差示扫描量热法(DSC)和广角X射线衍射(WAXD)研究了天然橡胶的低温结晶结晶度及晶粒尺寸。研究结果表明,天然橡胶低温结晶时出现两种结晶类型,其结晶度随着结晶时间的延长而增加,在5 h左右结晶完全;天然橡胶的结晶度和晶粒尺寸没有发生变化。表明天然橡胶低温结晶结晶度的增加来源于晶粒尺寸的增长而不是晶粒数量的增加。
As a green self-reinforcing polymer material, natural rubber has the advantage that synthetic rubber can't match. There have been a lot of literature reports on strain-induced crystallization of natural rubber, but there are few reports on the research of low-temperature crystallization of natural rubber. The research on low-temperature crystallization of natural rubber has theoretical guiding significance for the production of low-temperature resistant natural rubber products. In this paper, the low temperature crystallinity and grain size of natural rubber were studied by differential scanning calorimetry(DSC) and wide-angle X-ray diffraction(WAXD). The results show that there are two kinds of crystals when natural rubber is crystallized at low temperature. The crystallinity increases with the crystallization time, and it crystallizes completely at about 5 h. The crystallinity and grain size of natural rubber do not change. It indicates that the increase in the crystallinity of low-temperature crystallinity of natural rubber is derived from the increase in grain size rather than the increase in the number of grains.
As a green self-reinforcing polymer material, natural rubber has the advantage that synthetic rubber can't match. There have been a lot of literature reports on strain-induced crystallization of natural rubber, but there are few reports on the research of low-temperature crystallization of natural rubber. The research on low-temperature crystallization of natural rubber has theoretical guiding significance for the production of low-temperature resistant natural rubber products. In this paper, the low temperature crystallinity and grain size of natural rubber were studied by differential scanning calorimetry(DSC) and wide-angle X-ray diffraction(WAXD). The results show that there are two kinds of crystals when natural rubber is crystallized at low temperature. The crystallinity increases with the crystallization time, and it crystallizes completely at about 5 h. The crystallinity and grain size of natural rubber do not change. It indicates that the increase in the crystallinity of low-temperature crystallinity of natural rubber is derived from the increase in grain size rather than the increase in the number of grains.
引文
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[2] Hernández M,Miguel A,López M,Sanz A,Nogales A,Tiberio A E.Macromolecules,2011,44 (16):6574～6580.
[3] 高扬建树,汪志芬,李思东,钟杰平,彭政,廖双泉.材料科学与工程学报,2016,34 (1):101～105.
[4] 张兴华,严大东.高分子学报,2014,8:1041～1047.
[5] 赵慧,董为民,张学全,门永锋.应用化学,2008,25 (10):1233～1236.
[6] 邓东华,汪月琼,钟杰平,李普旺,廖禄生,许逵,秦云霞,王兵兵,彭政.热带农业科学,2016,36 (10):59～64.
[7] Shashidhara G M,Pradeepa K G.Thermochimica Acta,2014,578:1～9.
[8] Bascom W D,,Cottington R L.J Adhes,1976,7:333～346.
[9] Tosaka M,Murakami S,Poompradub S,Kohjiya S,Tosaka M,Ikeda Y,Toki S,Sics I,Benjamin S H.Macromolecules,2004,37 (9):3299～3309.
[10] Toki S,Sics I,Ran S F,Liu L Z,Benjamin S H,Murakami S,Senoo K,Kohjiya S.Macromolecules,2002,35 (17):6578～6584.
[11] 张宏放,莫志深,魏学军,书香,韩平.高分子学报,1988,6:416～421.
[12] Dupres S,Didier R.L,Albouy P,Sotta P.Macromolecules,2009,42 (7):2634～2644.
[13] 王象民.橡胶参考资料,2003,33 (6):33～37.
[14] Chenal J M,Chazeau L,Bomal Y,Gauthier C..Polym Phys,2007,45 (8):955–962.
[15] 何曼君,陈维孝,董西侠.高分子物理.修订版.上海:复旦大学出版社,1990,86.
[16] 曾幸荣.高分子近代测试分析技术.广州:华南理工大学出版社,2007,295～298.
[17] Plagge J,Klüppel M.Macromolecules,2018,51(10):3711～3721.
[18] Alcock B,Olafsen K,Huse J,Grytten F.Polym Testing,2018,4(66):228～234.