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简答题 The slower the force, and the longer it is maintained, the greater is the permanent set (永久变形)
学科：默认课程
时间：2025-12-26 23:18:28
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题目1简答题
By the early nineteenth century, rubber was recognized as a flexible, tough (坚韧的), waterproof (防水) and air-impermeable (不透气的) material题目2简答题
The "masticator" (塑炼机) invented by Thomas Hancock (托马斯﹒汉考克) subjected the rubber to intensive shearing (剪切) that softened it sufficiently to allow mixing and shaping (成型)题目3简答题
The dried latex received the name "rubber" in 1770 when John Priestly discovered that it could rub out (擦除) pencil marks题目4简答题
More importantly, rubber articles made from natural rubber latex became stiff (刚性的) and hard in cold weather, and soft and sticky (黏性的) in hot weather题目5简答题
Vulcanization——heating the mixture of rubber and sulfur (硫磺) to crosslink the rubber polymer network——greatly improved rubber strength (强度) and elasticity and eliminated its deficiencies (缺陷) at temperature extremes题目6简答题
Due to its high structural regularity(规整性), natural rubber tends to crystallize (结晶) spontaneously at low temperatures or when it is stretched (拉伸)题目7简答题
The strain-induced crystallization (应变诱导结晶) gives natural rubber products high tensile strength (拉伸强度) and resistance to cutting (抗剪强度), tearing (撕裂), and abrasion题目8简答题
The slower the force, and the longer it is maintained, the greater is the permanent set (永久变形)题目9简答题
Emulsion polymerization (乳液聚合) is carried out either hot, at about 50℃, or cold, at about 5 ℃, depending upon the initiating system (引发体系) used题目10简答题
Oil extension of SBR improves processing characteristics (加工特性), primarily allowing easier mixing (混炼), without sacrificing physical properties (力学性能)下载 题海APP
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