What is topology in chemistry polymers?

Topological polymers may refer to a polymeric molecule that possesses unique spatial features, such as linear, branched, or cyclic architectures. It could also refer to polymer networks that exhibit distinct topologies owing to special crosslinkers.

Why is topology important in polymers?

The topology of polymer molecules is often a basis to control their properties and functions at static and dynamic states both in bulk and in solution.

How does topology Affect Polymers?

The topology of the polymer i.e., linear, stars, and branched, affects the macroscopic flow characteristics of melts, where introducing one branch is sufficient to increase the viscosity significantly.

What is Quantum Chemical topology?

Quantum Chemical Topology (QCT) is a branch of theoretical chemistry that uses the language of dynamical systems (e.g. attractor, basin, homeomorphism, gradient path/phase curve, separatrix, critical points) to partition chemical systems and characterise them via associated quantitative properties.

What is known as linear topology?

Definition. A linear topology is a network topology consisting of a main run of cable with a terminator at each end. All nodes (file server, workstations, and peripherals) are connected to the linear cable. Ethernet and LocalTalk networks use a linear bus topology.

What topology did LDPE and HDPE exhibit?

HDPE has linear structure with very few or no branching and possesses high degree of crystallinity. On the other hand, LDPE has chaotic structure with short and long chain branches and lower degree of crystallinity in comparison to HDPE.

What is the most common topologies for polymers?

The chain is the most basic of polymer structures. This topology is often referred to simply as a chain or, to underscore the structure, a linear polymer.

What is chain topology?

Chain Topology—Each unit is connected to the neighboring unit, but there is no cable connection between the first and last unit. • Ring Topology—Each unit is connected to the neighboring unit. The last unit is connected to the first unit.

What is form network polymers?

28 The polymer networks are prepared by a crosslinking reaction of poly(vinyl butyral) and hexamethylene diisocyanate.

What polymer was investigated with LDPE and HDPE?

The carbonyl and vinyl index, the crystalline phase fraction, and the dichroic ratio were used to evaluate the photooxidation of these polymers. The results obtained show that LDPE and HDPE undergo a major degree of oxidation and an increase in the crystalline phase fraction comparing to PE-BIO and PE-OXO.

What is the most common topology?

Star topology is by far the most common. Within this framework, each node is independently connected to a central hub via a physical cable—thus creating a star-like shape. All data must travel through the central node before it reaches its destination.

What topology is in a circle?

A ring topology is a network configuration where device connections create a circular data path. Each networked device is connected to two others, like points on a circle.

What is the use of topologies?

Network topology is used to define the layout of a network, its structure, and its shape, both physically and logically. A network can have one physical topology and multiple logical topologies simultaneously. Physical network layout refers to the physical connections of the devices such as wires, cables, and more.

What is the main difference between HDPE and LDPE?

As its name suggests, low-density polyethylene (LDPE) has a lower density, strength, and temperature resistance. Meanwhile, high-density polyethylene (HDPE) is characterized by higher specific strength and heat resistance.

What HDPE stands for?

But high-density polyethylene (or HDPE) plastic has been courting my favor recently. Not only is it one of the most versatile of plastics—used in everything from hard hats to house wraps—it’s also widely recycled, in both its rigid form (e.g., containers) and flexible form (e.g., bags).

What is the difference between PE and HDPE?

The Difference Between HDPE and PE Pipes HDPE is a type of PE pipe. However, HDPE pipes are more durable than other PE pipes because they come with high melting and impact points. HDPE pipe is tough, resistant to chemicals, resistant to corrosion, and light in weight.

What are the 3 basic structure of polymers?

The four basic polymer structures are linear, branched, crosslinked, and networked.

Which polymer structure is the strongest?

Polymeric chain molecules contain atomic groups, covalently bonded in the chain direction. In most polymers the covalent bonds have approximately the same strength as the C–C bond in diamond, which is the strongest material in nature.

How is polymer flow classified?

The most common way of classifying polymers is to separate them into three groups – thermoplastics, thermosets, and elastomers.

What is point to point topology?

A point-to-point topology is any network that connects two hosts in a dedicated fashion. For example, if you were to configure a router in Miami, Florida, to connect and use resources on a network in Atlanta, Georgia, you would want to make sure you had a link between them that can support your needs.

What is Daisy topology?

A daisy chain is a type of network topology that directs how network nodes – typically, computers – are linked. Different network topologies support objectives, like ease of use, persistence and fault tolerant design.

What is network topology and types of topology?

Network topology refers to the geometric arrangement of links and nodes in a computing network. Alternately, network topology may describe how the data is transferred between these nodes. There are two types of network topologies: physical and logical.

Is PVC a network polymer?

It is a network structure. Polyethylene and PVC are long-chain, linear polymer.

What is an example of a network polymer?

An example of a network polymer formed by weak connections is the gel formed by pectin. This natural network polymer is the basis for jellies and jams. The properties of network polymers depend on the density of the network.

Is nylon a network polymer?

Yes, Nylon-6,6 is a network polymer .

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