Polymers are a broad class of materials which are made from repeating units of smaller molecule called monomers. Polymers can be natural in origin such as the lignin of tree branches. Other polymers are termed synthetic, because they are made by humans from naturally-occurring materials. Example ...
What are Polymers? Understand Polymerization Reactions with Classification, Structure, Types, Properties and Uses of polymers. Learn to find the Molecular Mass of polymers with examples.
Your good commander-in-chief the elder brother, knew you are very happy! My name is called Maria, this year 47 years old, are a teacher, has the husband and the son, my entire family all believes in God, God loves me, I also works for God![translate] ...
In comparison, a crystalline polymer has an systematized, “crystal-like” structure, but also comprises of amorphous material. It is usually known as a semi-crystalline thermoplastic material. These types of plastics are commonly tougher and less fragile compared to amorphous thermoplastics. It is...
InterestingTidbitsAboutPolymers【ReadingMaterial】TheHistoryofPolymers 教学目的及要求 •掌握：聚合物的定义、结构特征、分类、分子运动、玻璃化温度的决定因素。•熟悉：常见聚合物。•了解：日常用聚合物。教学重点难点 专业英语词汇、专业词汇构词法、专业英语特点、课文翻译。WhatArePolymers?• Polymersare...
Whatarepolymers（macromolecules）?——substancescontainingalargenumberofstructuralunits(“mers”)joinedbythesametypeoflinkage.→chain-likestructureOr:verylargemoleculesmadeupofsmallerunits,calledmonomersorrepeatingunits,covalentlybondedtogetherAtypicalpolymermayincludetensofthousandsofmonomers.Thisspecificmolecularstructure(...
mutual solubility of a polymer and a solvent, the Gibbs free energy of mixing (DGmix) is considered that is expressed by the following relation: DGmix¼DHmix À TDSmix ð1Þ where DHmix and DSmix are the enthalpy and entropy of mixing, respectively, and T is the absolute ...
Organoboron compounds have been playing an increasingly important role in analytical chemistry, material science, health applications, and particularly as functional polymers like boron carriers for cancer therapy. There are two main applications of boro
Pockels effect is well known as a nonlinear change in the refractive index of a noncentrosymmetric material that is induced by a DC field. In general, the PR effect appears in materials that are irradiated by coherent interference beams. In the bright region of an illuminated region, the ...
Tiny streams of polymer that emerge from these holes (called filaments) are wound together as they solidify, forming a long fiber. Speeds of up to 2500 feet/minute can be employed in spinning.生产纤维的过程被称为纺丝。有三种主要的纺丝类型:熔融纺、干纺和湿纺。熔融纺丝用于容易被融化的聚合物...