Recent Lessons

Show all results for ""

Feature Overview

Ace your exams with our all-in-one platform for creating and sharing quizzes and tests.

Quizzes

Create quizzes and tests automatically from your content using AI.

Flashcards

Automatically turn your notes into digital flashcards.

Share, Export & Embed

Share with classmates or export to Excel and your learning management system.

Stats & Reporting

Auto-grading quizzes and tests with detailed stats and reports.

Mobile Apps

The smarter way to study – wherever you are.

Pricing

Search...

16 Questions

0 Views

Characteristics of Standard Rayon

Choose a study mode

Play Quiz

Study Flashcards

Spaced Repetition

Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What contributes to the good dye absorption properties of standard rayon?

The longitudinal striated shape

The addition of liquid during coagulation

Serrated circular cross-section (correct)

The presence of zinc in the fiber

Which type of rayon has a rounder cross-section, allowing for different properties?

HWM rayon (correct)

Standard rayon

Viscose rayon

Filament rayon

What chemical property makes rayon resistant to dilute alkalis and organic solvents?

Presence of crystalline areas

Shorter molecular chains (correct)

Longitudinal striated shape

High molecular weight

What is the effect of stretching on viscose rayon after spinning?

It aligns the molecules for greater strength Signup and view all the answers

Which of the following damages rayon?

Concentrated acids Signup and view all the answers

What biological factor can destroy rayon?

Mildew Signup and view all the answers

What is the main factor responsible for the serrated circular shape of standard rayon?

Zinc oxide in the spinning bath Signup and view all the answers

What distinguishes the molecular structure of viscose rayon from that of cotton or flax?

Greater number of crystalline areas Signup and view all the answers

How does the molecular structure of HWM rayon differ from standard rayon?

More crystalline and oriented molecules Signup and view all the answers

What contributes to the bright appearance of viscose rayon?

De-lustering with titanium dioxide Signup and view all the answers

Which type of rayon has an indented shape that aids in good dye absorption?

HWM rayon Signup and view all the answers

How does the alkali cellulose and viscose rayon aging process affect the molecular structure?

Shortens the molecular chains severely Signup and view all the answers

What kind of acids damage rayon?

Hot concentrated acids Signup and view all the answers

What can destroy rayon due to biological factors?

Silverfish and mildew-producing bacteria Signup and view all the answers

What role does stretching play in enhancing the strength of viscose rayon?

Aligns molecules for greater strength Signup and view all the answers

What can cause a decrease in the brightness of viscose rayon?

Action of titanium dioxide Signup and view all the answers