The pendant groups in the partial structure of polypropylene are to be determined. Concept introduction: Polymer is a substance made up of a large number of smaller molecules that link together to form larger molecules. The long, continuous chain of atoms that runs from one end of the molecule to the other is called the polymer chain, main chain, or backbone. When a polymer has a main chain, non-hydrogen atoms or groups attached to it are called side groups or pendant groups. Pendant means “hanging,” so it appropriately describes these groups that are hanging off the polymer chain.

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Definition Definition Chemical process in which one or more monomers combine to produce a very large chain-like molecule called a polymer. The functional groups present on the monomers and their steric effects are responsible for polymerization through a sequence of reactions that vary in complexity. There exists a stable covalent chemical bond between monomers that sets apart polymerization from other processes.

Chapter 26, Problem 26.1YT

Interpretation Introduction

Interpretation:

The pendant groups in the partial structure of polypropylene are to be determined.

Concept introduction:

Polymer is a substance made up of a large number of smaller molecules that link together to form larger molecules. The long, continuous chain of atoms that runs from one end of the molecule to the other is called the polymer chain, main chain, or backbone. When a polymer has a main chain, non-hydrogen atoms or groups attached to it are called side groups or pendant groups. Pendant means “hanging,” so it appropriately describes these groups that are hanging off the polymer chain.

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(a 4 shows scanning electron microscope (SEM) images of extruded actions of packing bed for two capillary columns of different diameters, al 750 (bottom image) and b) 30-μm-i.d. Both columns are packed with the same stationary phase, spherical particles with 1-um diameter. A) When the columns were prepared, the figure shows that the column with the larger diameter has more packing irregularities. Explain this observation. B) Predict what affect this should have on band broadening and discuss your prediction using the van Deemter terms. C) Does this figure support your explanations in application question 33? Explain why or why not and make any changes in your answers in light of this figure. Figure 4 SEM images of sections of packed columns for a) 750 and b) 30-um-i.d. capillary columns.³

fcrip = ↓ bandwidth Il temp 32. What impact (increase, decrease, or no change) does each of the following conditions have on the individual components of the van Deemter equation and consequently, band broadening? Increase temperature Longer column Using a gas mobile phase instead of liquid Smaller particle stationary phase Multiple Paths Diffusion Mass Transfer

34. Figure 3 shows Van Deemter plots for a solute molecule using different column inner diameters (i.d.). A) Predict whether decreasing the column inner diameters increase or decrease bandwidth. B) Predict which van Deemter equation coefficient (A, B, or C) has the greatest effect on increasing or decreasing bandwidth as a function of i.d. and justify your answer. Figure 3 Van Deemter plots for hydroquinone using different column inner diameters (i.d. in μm). The data was obtained from liquid chromatography experiments using fused-silica capillary columns packed with 1.0-μm particles. 35 20 H(um) 큰 20 15 90 0+ 1500 100 75 550 01 02 594 05 μ(cm/sec) 30 15 10

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Definition Definition Chemical process in which one or more monomers combine to produce a very large chain-like molecule called a polymer. The functional groups present on the monomers and their steric effects are responsible for polymerization through a sequence of reactions that vary in complexity. There exists a stable covalent chemical bond between monomers that sets apart polymerization from other processes.

Chapter 26, Problem 26.1YT

Interpretation Introduction

Interpretation:

The pendant groups in the partial structure of polypropylene are to be determined.

Concept introduction:

Polymer is a substance made up of a large number of smaller molecules that link together to form larger molecules. The long, continuous chain of atoms that runs from one end of the molecule to the other is called the polymer chain, main chain, or backbone. When a polymer has a main chain, non-hydrogen atoms or groups attached to it are called side groups or pendant groups. Pendant means “hanging,” so it appropriately describes these groups that are hanging off the polymer chain.

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Answer 3

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Definition Definition Chemical process in which one or more monomers combine to produce a very large chain-like molecule called a polymer. The functional groups present on the monomers and their steric effects are responsible for polymerization through a sequence of reactions that vary in complexity. There exists a stable covalent chemical bond between monomers that sets apart polymerization from other processes.

Chapter 26, Problem 26.1YT

Interpretation Introduction

Interpretation:

The pendant groups in the partial structure of polypropylene are to be determined.

Concept introduction:

Polymer is a substance made up of a large number of smaller molecules that link together to form larger molecules. The long, continuous chain of atoms that runs from one end of the molecule to the other is called the polymer chain, main chain, or backbone. When a polymer has a main chain, non-hydrogen atoms or groups attached to it are called side groups or pendant groups. Pendant means “hanging,” so it appropriately describes these groups that are hanging off the polymer chain.

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Answer 4

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Definition Definition Chemical process in which one or more monomers combine to produce a very large chain-like molecule called a polymer. The functional groups present on the monomers and their steric effects are responsible for polymerization through a sequence of reactions that vary in complexity. There exists a stable covalent chemical bond between monomers that sets apart polymerization from other processes.

Chapter 26, Problem 26.1YT

Interpretation Introduction