まとめ
接面切断ストレスの測定は,ポリマーセグメントの移動性が摩擦に大きく影響することを明らかにします. インターフェースの両側の高度な移動性のある材料は,より低いストレスを引き起こすが,薄い鎖は摩擦を増加させる.
科学分野:
- ポリマーサイエンスの科学
- トリボロジ トリボロジ トリボロジ
- マテリアルサイエンス 材料科学
背景:
- ポリマーのインターフェイスの振る舞いを理解することは,潤滑剤やポリマー加工などのアプリケーションに不可欠です.
- 界面切断張力は,ポリマーの壁の滑りや溶融骨折などの現象を制御する.
研究 の 目的:
- 移動可能なポリマーネットワーク (エラストーマー) と不動的な (ガラス状) ポリマー表面の間の接面切断張力を測定する.
- 断片の移動性と鎖の層が接面摩擦に及ぼす影響を調査する.
主な方法:
- 高移動性ポリマーネットワークを,端に固定された移動性チェーンでコーティングされた滑らかなガラスのようなポリマー表面の上に滑り込む.
- 制御された滑り実験のインターフェイスで自由チェーンがないことを保証します.
主要な成果:
- インターフェースの切断ストレスは,インターフェースの両側にあるポリマーのセグメント移動性に強く依存しています.
- 両方の材料が高度に移動している場合,下部界面切断ストレスが観察されます.
- 鎖の薄い層は,表面間の摩擦を高めることができます.
結論:
- ポリマーセグメントの移動性は,界面切断ストレスを決定する重要な要因です.
- 縛られたチェーン層は,インターフェイスの摩擦特性を修正するために利用できます.
- この発見は,潤滑剤の性能や,壁の滑りなど,ポリマー加工の課題にも影響を及ぼします.
関連する概念動画
01:21Characteristics of Dry Friction
Dry friction occurs when two solid surfaces slide against each other without any lubrication or fluid present. It causes resistance when pushing objects along a surface, like a gardener pushing a wheelbarrow. The force applied to move the cart causes dry friction between the wheel and the ground.
Before the wheelbarrow starts moving, the static frictional force acts tangentially to the contact surface, opposing the force that is about to induce the motion. This frictional force prevents the...
Before the wheelbarrow starts moving, the static frictional force acts tangentially to the contact surface, opposing the force that is about to induce the motion. This frictional force prevents the...
01:27Types of Friction Problems
Friction is an essential concept in physics, engineering, and everyday life. It is the force that opposes the relative motion or tendency of such motion between two surfaces in contact. One of the most common types of friction encountered in various applications is dry friction. Dry friction problems can be broadly categorized into three types, each with unique characteristics and challenges.
The first type of dry friction problem involves situations where there is no apparent impending motion.
The first type of dry friction problem involves situations where there is no apparent impending motion.
01:07Frictional Force
When a body is in motion, it encounters resistance because the body interacts with its surroundings. This resistance is known as friction, a common yet complex force whose behavior is still not completely understood. Friction opposes relative motion between systems in contact, but also allows us to move. Friction arises in part due to the roughness of surfaces in contact. For one object to move along a surface, it must rise to where the peaks of the surface can skip along the bottom of the...
01:14Rolling With Slipping
Rolling with slipping is a physical phenomenon that occurs when a rolling object experiences both rotational and linear motion but also experiences frictional forces that cause slipping. This phenomenon can occur in various situations, such as when a tire rolls on a wet road or a ball rolls on a rough surface.
An object's rolling motion is characterized by its rotation around its axis, while linear motion refers to the object's translational motion along a surface. Frictional forces can affect...
An object's rolling motion is characterized by its rotation around its axis, while linear motion refers to the object's translational motion along a surface. Frictional forces can affect...
01:30Dry Friction
Dry friction occurs between two solid surfaces in contact as they attempt to move relative to one another. In daily life, dry friction is encountered in various forms, such as when walking on the ground, sliding an object across a table, or rubbing hands together. Despite its ubiquity, the underlying mechanisms behind dry friction are not readily visible.
To illustrate this concept, imagine a wooden crate resting on a rough, non-uniform horizontal surface. When an external force is applied to...
To illustrate this concept, imagine a wooden crate resting on a rough, non-uniform horizontal surface. When an external force is applied to...
01:23Design Example: Deciding Thickness of Lubricating Fluid in a Shaft
Effective lubrication between a rotating shaft and its bearing housing is essential in rotating machinery to minimize friction, wear, and energy loss. With carefully controlled thickness and viscosity, the lubricant layer prevents metal-to-metal contact, ensuring smooth operation.
To calculate the required thickness of the lubricant layer, the tangential velocity at the shaft's surface must first be determined. This velocity is calculated by converting the rotational speed to angular velocity...
To calculate the required thickness of the lubricant layer, the tangential velocity at the shaft's surface must first be determined. This velocity is calculated by converting the rotational speed to angular velocity...