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Lectures on Numerical Methods in Bifurcation Problems
Methods for Finding Zeros in Polynomials
Lectures on Stochastic Flows and Applications
Educational Psychology by Edward L. Thorndike
The Last Days of Tolstoy by V. G. Chertkov
Globalization and Responsibility
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Linear Algebra: Theorems and Applications
Lectures on Stochastic Differential Equations and Malliavin Calculus
A Short Biographical Dictionary of English Literature
Lectures on Sieve Methods and Prime Number Theory
Dollars and Sense by William Crosbie Hunter
The Theory of the Theatre by Clayton Hamilton
The Mathematics of Investment
Occupiers of Wall Street: Losers or Game Changers
The Solution of the Pyramid Problem
Lectures on Moduli of Curves
Walden by Henry David Thoreau
Methods for Finding Zeros in Polynomials
Lectures on Stochastic Flows and Applications
Educational Psychology by Edward L. Thorndike
The Last Days of Tolstoy by V. G. Chertkov
Globalization and Responsibility
Lectures on Siegel Modular Forms and Representation by Quadratic Forms
Lectures on Topics In One-Parameter Bifurcation Problems
History of the Incas by Pedro Sarmiento de Gamboa
Linear Algebra: Theorems and Applications
Lectures on Stochastic Differential Equations and Malliavin Calculus
A Short Biographical Dictionary of English Literature
Lectures on Sieve Methods and Prime Number Theory
Dollars and Sense by William Crosbie Hunter
The Theory of the Theatre by Clayton Hamilton
The Mathematics of Investment
Occupiers of Wall Street: Losers or Game Changers
The Solution of the Pyramid Problem
Lectures on Moduli of Curves
Walden by Henry David Thoreau
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塑料制品学习要点
Posted on 2010-04-28
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有机玻璃 简介 有机玻璃是聚甲基丙烯酸甲酯的俗称,它是由甲基丙烯酸甲酯单体聚合而成的线型树脂,其英文缩写为PMMA。 识别特征 透明度 触感 色泽 敲击 燃烧特征 教师现场演示 性能 1.光学性能、透光率 2.染色性能 3.低温使用 4.卫生性能 用途 有机玻璃主要用于航空、轮船、车辆、仪表的透明护罩及安全防护罩等,也被大量用于光学工业透镜和医用导光管等;还用于制作文具、日用品,如笔杆、丁字尺、三角尺、烟盒、伞柄等。 3.2.8硝酸纤维塑料 简介 硝酸纤维素塑料是棉短绒或其它草类、木材等天然纤维素经硝酸酯化成硝酸纤维素,再加入20—30%的增塑剂樟脑而制成的塑料。它的商业名称为赛璐珞,英文缩写为CN。 识别特征 透明度 气味 耐高温 燃烧特征 教师现场演示 性能 1.染色 2.软化温度 3.对油类稳定性 4.在酸、碱溶液中稳定性 5.在光和热的长期作用下 用途 赛璐珞主要用于制作文教用品,如三角尺、笔杆、乐器外壳等,还可制作眼镜框、伞柄等;还常用作玩具、梳子、皂盒等。由于质轻、弹性好,故是制作乒乓球的好原料。 3.2.9应用塑料 泡沫塑料 1.概念 泡沫塑料是一种内部具有无数微小气孔的塑料,具有质软、隔热、吸音、缓冲等性质。 2.分类 根据软硬程度的不同分为软、半硬质和硬质泡沫塑料三种;根据气泡结构又可分为开孔泡沫塑料和闭孔泡沫塑料。 3.用途 泡沫塑料广泛用于隔音、绝热、保温、绝缘、防震、过滤、包装等材料。 人造革 人造革是用纤维与塑料结合在一起的复合材料。目前常见的人造革,主要是聚氯乙烯人造革。 人造革具有质地柔软、富有弹性、机械强度高、耐酸碱、不易燃烧、易洗涤、色泽鲜艳、花纹图案多样的特点,故应用特别广泛。常用来制作服装、帽子、手套、鞋、沙发、椅子等覆盖用材料。 合成革 合成革的表面是聚氨酯树脂。它是在复合纤维针织布上或无纺布上涂复聚氨酯微孔弹性体形成的复合材料。 合成革具有抗氧化、耐磨、耐油等特点,机械强度、耐磨性、弹性都好于人造革;透气性和透湿汽性接近于天然皮革;表面硬度高,不易虫蛀、霉变、耐水、耐油性能好;制品尺寸稳定,不易变形,低温下质地同样柔软;制品外观光亮、美观、保养方便、坚固耐用。因此,用途极为广泛。 乒乓球 有机玻璃制品 脲醛纽扣 酚醛塑料制品 pvc ABS产品 聚苯乙烯原料 PP产品 3.2 几种主要塑料 本 节 结 构 3.2.1聚乙烯塑料 简介 聚乙烯塑料是乙烯单体的聚合物。它的商品名称简称为“乙塑”;英文缩写为PE。 根据聚乙烯密度大小不同,分为低密度聚乙烯[PE(L)]、中密度聚乙烯[PE(M)]和高密度聚乙烯[PE (H)]。 聚合方法 1.低密度聚乙烯 它是由乙烯单体用微量氧作引发剂,在1200一2000大气压、温度为100一300℃条件下,用氧、有机过氧化物或偶氮化合物为引发剂进行聚合而成。 2.中密度聚乙烯
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