(a) Hard contact lenses, which first became popular in the 1960s, were made by polymerizing methyl methacrylate [CH2 = C(CH3)CO2CH3] to form poly(methyl methacrylate) (PMMA). Draw the structure of PMMA. (b) More comfortable softer contact lenses introduced in the 1970s were made by polymerizing hydroxyethyl methacrylate [CH2 = C(CH3)CO2CH2CH2OH] to form poly(hydroxyethyl methacrylate) (poly-HEMA). Draw the structure of poly-HEMA. Since neither polymer allows oxygen from the air to pass through to the retina, newer contact lenses that are both comfortable and oxygen-permeable have now been developed.

Question
Asked Dec 29, 2019
8 views

(a) Hard contact lenses, which first became popular in the 1960s, were made by polymerizing methyl methacrylate [CH2 = C(CH3)CO2CH3] to form poly(methyl methacrylate) (PMMA). Draw the structure of PMMA. (b) More comfortable softer contact lenses introduced in the 1970s were made by polymerizing hydroxyethyl methacrylate [CH2 = C(CH3)CO2CH2CH2OH] to form poly(hydroxyethyl methacrylate) (poly-HEMA). Draw the structure of poly-HEMA. Since neither polymer allows oxygen from the air to pass through to the retina, newer contact lenses that are both comfortable and oxygen-permeable have now been developed.

check_circle

Expert Answer

Step 1

(a)The structure of methyl methacrylate is given as follows:

Chemistry homework question answer, step 1, image 1
fullscreen
Step 2

The polymerization of methyl methacrylate to form poly (methyl methacrylate) is an addition polymerization.  The reaction is given as follows:

Chemistry homework question answer, step 2, image 1
fullscreen
Step 3

(b)The structure of hydroxyethyl meth...

Chemistry homework question answer, step 3, image 1
fullscreen

Want to see the full answer?

See Solution

Check out a sample Q&A here.

Want to see this answer and more?

Solutions are written by subject experts who are available 24/7. Questions are typically answered within 1 hour.*

See Solution
*Response times may vary by subject and question.
Tagged in

Science

Chemistry

Polymers

Related Chemistry Q&A

Find answers to questions asked by student like you
Show more Q&A
add
question_answer

Q: What are the units of specific heat?

A: Specific heat is the amount of heat per unit mass (kg or g) required to change the temperature of a ...

question_answer

Q: why iodine is dark violet in colour?

A: Visible region: The electromagnetic radiation in range of is regarded as visible region which is act...

question_answer

Q: when H2O2 is added into acidified K2Cr2O7 which colour appears?

A: The reaction between potassium dichromate and hydrogen peroxide is given by

question_answer

Q: If you know the specific heat of copper, what additional information do you need to calculate the he...

A: The heat required to raise the temperature of a substance by one degree Celsius is said to be Heat c...

question_answer

Q: what does magnetic quantum number determines?

A: The number of electrons present in an atom is determined by quantum numbers. The number of electroni...

question_answer

Q: Treatment of benzaldehyde (C6H5CHO) with Zn(Hg) in aqueous HCl forms a compound Z that has a molecul...

A: Aldehydes or ketones undergoes reduction to form hydrocarbons when treated with Zn(Hg) in the presen...

question_answer

Q: Sodium hypochlorite (NaOCl, the oxidant in household bleach) in aqueous CH3COOH is also touted as a ...

A: Click to see the answer

question_answer

Q: which is the major constituent of natural gas?

A: The natural gas is also known as fossil gas. This gas is a mixture of higher alkanes, methane, nitro...

question_answer

Q: diffrentiate between oil in water emulsion and water in oil emulsion.

A: Dispersed phase and dispersion medium are liquids in the colloidal systems. Such liquid systems are ...