a) A neat polymer and its fibre reinforced composite undergo isothermal crystallisation separately under three different...
Fantastic news! We've Found the answer you've been seeking!
Question:
Transcribed Image Text:
a) A neat polymer and its fibre reinforced composite undergo isothermal crystallisation separately under three different temperatures 260 °C, 280 °C and 300 °C. The relative volume crystallinity generated during the isothermal crystallisation is plotted against time as shown in Figure 2a. Compare and explain the isothermal crystallisation behaviours of i) the neat polymers at three different temperatures and ii) the same polymers reinforced with fibre at each temperature. Neat unreinforced polymer Relative crystallinity vs. time b) Relative volume crystallinity 0.8 0.6 0.4 0.2 Relative volume crystallinity 0.8 0.6 0.4 22 5 10 260°C <-280°C 300 C 15 20 25 Time (min) Composite (Polymer + Carbon Fibre) Relative crystallinity vs. time 0 5 10 15 20 20 Time (min) 260°C <-280°C 300°C 25 25 Figure 2a A grade of polypropylene is found to have the following tensile creep compliance, D(t), when measured at 35 °C: D(t) = 1.2t01 GPa, where t is expressed in seconds. It exhibits time-temperature superposition and obeys the Arrhenius equation with an activation enthalpy of AH = 170 kJ.mol-1. Calculate the tensile creep compliance of this grade of polypropylene at 40 °C. a) A neat polymer and its fibre reinforced composite undergo isothermal crystallisation separately under three different temperatures 260 °C, 280 °C and 300 °C. The relative volume crystallinity generated during the isothermal crystallisation is plotted against time as shown in Figure 2a. Compare and explain the isothermal crystallisation behaviours of i) the neat polymers at three different temperatures and ii) the same polymers reinforced with fibre at each temperature. Neat unreinforced polymer Relative crystallinity vs. time b) Relative volume crystallinity 0.8 0.6 0.4 0.2 Relative volume crystallinity 0.8 0.6 0.4 22 5 10 260°C <-280°C 300 C 15 20 25 Time (min) Composite (Polymer + Carbon Fibre) Relative crystallinity vs. time 0 5 10 15 20 20 Time (min) 260°C <-280°C 300°C 25 25 Figure 2a A grade of polypropylene is found to have the following tensile creep compliance, D(t), when measured at 35 °C: D(t) = 1.2t01 GPa, where t is expressed in seconds. It exhibits time-temperature superposition and obeys the Arrhenius equation with an activation enthalpy of AH = 170 kJ.mol-1. Calculate the tensile creep compliance of this grade of polypropylene at 40 °C.
Expert Answer:
Related Book For
Business Statistics For Contemporary Decision Making
ISBN: 978-1118749647
8th edition
Authors: Black Ken
Posted Date:
Students also viewed these chemical engineering questions
-
Project the 2 4-1 IV design in Example 8-1 into two replicates of a 2 2 design in the factors A and B. Analyze the data and thaw conclusions. Example 8-1: Consider the filtration rate experiment in...
-
The following additional information is available for the Dr. Ivan and Irene Incisor family from Chapters 1-5. Ivan's grandfather died and left a portfolio of municipal bonds. In 2012, they pay Ivan...
-
Chiz enterprise reports its gross sales/receipts during the quarter as follows: Sale of computers Gross receipts - computer repairs Sales returns and allowances Sales discounts for early payments...
-
The number of hours of daylight that occur at any location on Earth depends on the time of year and the latitude of the location. The equations below model the numbers of hours of daylight in Seward,...
-
For the following exercises, assume two die are rolled. What is the probability that a roll includes a 2 or results in a pair?
-
You are working on charge-storage devices for a research center. Your goal is to store as much charge on a given device as possible. The facilities allow you to generate almost any potential...
-
The following accounts are taken from Equilibrium Riding, Inc., a company that specializes in occupational therapy and horseback riding lessons, as of December 31. Required: Using the unadjusted...
-
26 The number of protons, neutrons, electrons in some particles are shown in the table below Particle Protons Neutrons electrons P 1 1 2 Q 2 2 2 R 3 4 2 T 4 5 4 Which one of the following particles...
-
Write a short note on Preventing, Detecting, and Fixing Data Errors.
-
Ranze, the Store Manager of SM Bacoor Supermarket wants to determine the effect of TV advertising to the branch sales per month. He was able to monitor the TV Ads expenditure and the sales per month....
-
This assignment allows for class discussion on the topics of this module. Through your class discussions you are allowed the opportunity to share "real-world" examples with your classmates which help...
-
What term refers to the elevation of subjects of a painting by portraying them in poses and settings normally associated with positions of high status and power?
-
Present a report of the given case along with some relevant references . The plaintiff attended a bridal shower that was held at the defendant's dance hall. She paid an admission fee and sat at a...
-
h) Concerning software maintenance problems, explain six (6) factors that influencemaintainability. i) Describe three (3) situations in which even a system of high quality and great businessvalue...
-
A group of Chinese entrepreneurs has developed a smartphone app that enables users to play the game of go with other people or with the computer. The game can be used on various size game boards and...
-
Element compound homogeneous mixture (heterogeneous mixture) 4) A piece of gold has a mass of 49.75 g. What should the volume be if it is pure gold? Gold has a density of 19.3 g/cm (3 points) D=m/v...
-
A study is conducted to estimate the average difference in bus ridership for a large city during the morning and afternoon rush hours. The transit authoritys researcher randomly selects nine buses...
-
A medical researcher estimates that .00004 of the population has a rare blood disorder. If the researcher randomly selects 100, 000 people from the population, a. What is the probability that seven...
-
A glass manufacturer produces hand mirrors. Each mirror is supposed to meet company standards for such things as glass thickness, ability to reflect, size of handle, quality of glass, color of...
-
Differentiate between an open transaction and a closed transaction.
-
Differentiate between tax compliance and tax planning.
-
What form(s) is (are) used to file an individuals income tax return?
Study smarter with the SolutionInn App