发布时间 : 星期三 文章作业大全更新完毕开始阅读f518058dcc22bcd126ff0cf1
15. 硅橡胶具有优异的综合性能,它的硫化方式与通用橡胶有什么不同? 二、选择最合适的材料,并说明理由
1. 下列的哪一种材料最适合制造汽车的外胎:
(a)天然橡胶 (b)SBS (c)丁基橡胶 (d)丁腈橡胶 2. 下列的哪一种材料最耐臭氧:
(a) BR (b) NBR C. ethylene-propylene rubber D. natural rubber 3. 下列的哪一种材料最适合制作油密封垫:
(a)天然橡胶 (b)SBS (c)丁基橡胶 (d)丁腈橡胶 4. 下列的哪一种材料最适合耐溶剂性能最好:
(a)天然橡胶 (b) 丁腈橡胶 (c) 硅橡胶 (d) 氟橡胶 三、论述题
1. 列出目前主要商业化橡胶品种的玻璃化转变温度(Tg)的大小顺序,并从分子结构与性能的角度分析出现差别的原因及其相关应用情况。
2,从结构、性能角度出发,分析氟橡胶和硅橡胶具有优异综合性能的主要原因,并根据其主要性能列举出相关应用领域 Chapter 4
1. List two important characteristics for polymers that are to be used in fiber applications.
写出两种应用在纤维中的聚合物的重要特征
2. How do the thermal and mechanical properties of Nomex and Kevlar compare and how are these differences related to their chemical structure? Which polymer would be expected to have the largest characteristic ratio? How can molecular weight of these polymers be determined?
3. What is the minimum length to diameter ratio for a substance to be classified as a fiber?
纤维是最小长径比是多少的物质
4. Which is stronger: hydrogen bonding or dipole–dipole interactions? 氢键结合和偶极-偶极结合 那种强度更高
5. Besides hydrogen bonding, what else is characteristic of fiber molecules?
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除了氢键结合外,纤维分子还具有哪些特征 6. Which is more hydrophobic: cellulose or nylon 6,6? 纤维和尼龙66哪种疏水性跟强? 7. Is rayon produced by wet or dry spinning? 人造纤维是湿法纺丝还是干法纺丝?
8. Name two fibers that are produced by melt spinning. 写出两种熔融纺丝制作的纤维
9. Which has the lower denier value: a nylon fishline or nylon fiber used to manufacture hosiery?尼龙钓丝和尼龙纤维制造的针织品哪种价值更低? 10. How do the polyester fibers produced originally by Carothers differ from today’s polyester fibers, such as Dacron?
Carothers最初制作的聚酯纤维与现在的聚酯纤维比如涤纶有什么区别? 11. 天然纤维和化学纤维的种类有哪些? 12. 纤维的分子结构对纤维的性能有何影响?
13. 粘胶纤维为什么被称为再生纤维?其主要成分是什么?
14. 在纤维生产过程中为什么要进行拉伸,在拉伸过程中纤维的结构会发生什么变化?
15. 简述合成纤维生产过程中拉伸和热定型的作用。
16. 溶液纺丝和熔体纺丝方法有什么不同,它们分别适用于什么的聚合物? 17. 简述涤纶纤维的优缺点和主要的应用领域。
18. 写出尼龙66和Kevlar纤维的分子结构,讨论其结构与性能的关系。 19. 说明腈纶纤维中加入第二、三弹体对纤维的性能有哪些改进。
20. 再生纤维有哪些新品种?从可持续发展的角度来看,还有那些资源可以用于生产纤维? Chapter 5
1. Please explain the meaning of the following words: adhesive, adhesion and
cohesive?如何解释下列单词:粘合剂 粘合 凝聚力 2. How many types of adhesives can you list? Give some examples. 你能列举出多少种粘合剂,比如?
3. What are main resins of adhesives? And their advantages and disadvantages?
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有哪些主要的树脂粘合剂?它们的优缺点是什么?
4. Please explain the importance of contact angle of a surface to adhesion.
解释表面接触角对粘接的重要性
5. Please describe the process of adhesion. 描述粘接过程
6. Why does epoxy adhesive can bond tightly with metals?
为什么环氧粘合剂能紧紧的与金属粘接?
7. What is the mechanism of polyurethane adhesives’ reaction? What are reasons of urethane adhesives that make them good adhesives?
聚氨酯粘合剂的反应机理是什么?聚氨酯粘合剂为什么是一个好的粘合剂?
8. What are main application fields of adhesives? 粘合剂的主要应用领域是什么
9. How does a coating work? In other words, what are the processes of
film-forming?
涂料是如何工作的,换句话说,成膜的过程是什么?
10. What are main basic ingredients of coatings? And explain the function of resins
in coatings.
涂料的基本成分是什么?树脂在涂料中起什么作用?
11. Name the main compositions in a waterborne coating for inner walls of houses. 写出房屋内壁水性涂料的主要成分
12. What are main categories of pigments? Explain the differences between pigment
and dye in coating use.
色素的主要类别有哪些?解释颜料和染料在涂层时的差别
13. What do environment-friendly coatings include? Explain why they are
environment-friendly? 环境友好型涂料主要有什么?解释一下为什么它们是环境友好
型?
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14. Which kind of coatings is most suitable for exterior application for a car? And
why? 以下那种涂料最适合应用在汽车的外表面,原因 (1) Acrylic coatings; (2) Alkyd coatings; (3) Epoxy coatings.
1)丙烯酸涂料;(2)醇酸涂料;(3)环氧树脂涂料
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