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Mechanical characteristics of hydrogenated natural rubber vulcanizates

机译：氢化天然橡胶硫化胶的机械特性

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Mechanical properties of partially hydrogenated natural rubber (HNR) vulcanizates were evaluated regarding their chemical structure and crystallizable nature of HNR, and are reported here, to the best of our knowledge, for the first time. HNRs of three levels of hydrogenation (20.6, 29.0, and 40.6 mol%) were successfully prepared by the chemical modification of natural rubber (NR) latex using N{sub}2H{sub}4 and H{sub}2O{sub}2 as reagents, in a sufficient amount for preparing sulfur-crosslinked samples to be subjected to mechanical and structural measurements. The three HNR vulcanizates were found to be crystallizable upon stretching; it is noted that even 40.6 mol% hydrogenation did not prevent HNR vulcanizates from crystallization upon stretching, while their onset strain of crystallization was higher than that of NR vulcanizate. The hysteresis loss and residual strain up to a stretching ratio of 2 for the HNR vulcanizates tended to become larger with the increase in the degree of the hydrogenation. Tensile and dynamic mechanical properties of 20.6 mol% hydrogenated HNR vulcanizate were comparable to those of NR vulcanizate. From differential scanning calorimetry and temperature dispersion of dynamic modulus or loss, the glass transition temperatures of HNR vulcanizates were found to be almost the same as that of NR vulcanizate, which is also notable. The thermal stability of HNR vulcanizates was better than that of NR vulcanizate. Thus, this chemical modification seems to give a promising NR derivative whose properties can be equivalent or even better than the mother polymer.
机译：就部分氢化天然橡胶（HNR）的化学结构和HNR的可结晶性进行了机械性能评估，并据我们所知首次在此进行了报道。通过使用N {sub} 2H {sub} 4和H {sub} 2O {sub} 2对天然橡胶（NR）胶乳进行化学改性，成功制备了三种氢化水平（20.6、29.0和40.6 mol％）的HNR作为试剂，其量足以制备要进行机械和结构测量的硫交联样品。发现这三种HNR硫化橡胶在拉伸时可结晶。值得注意的是，即使40.6mol％的氢化也不能阻止HNR硫化橡胶在拉伸时结晶，而它们的结晶起始应变高于NR硫化橡胶。对于HNR硫化橡胶，直至拉伸比为2的磁滞损耗和残余应变倾向于随着氢化程度的增加而变大。 20.6 mol％氢化HNR硫化胶的拉伸和动态力学性能与NR硫化胶相当。通过差示扫描量热法和动态模量或损失的温度分散，发现HNR硫化橡胶的玻璃化转变温度与NR硫化橡胶的玻璃化转变温度几乎相同，这也是值得注意的。 HNR硫化橡胶的热稳定性优于NR硫化橡胶。因此，这种化学修饰似乎产生了有希望的NR衍生物，其性质可以与母体聚合物相当或什至更好。

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