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Which of the following is not a property of matrix materials which are modified by adding particulate fillers?

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Which of the following is not a property of matrix materials which are modified by adding particulate fillers?

(a) Improved performance at elevated temperature

(b) Decrease in surface hardness

(c) Modification in electrical conductivity

(d) Improved abrasion resistance

The question was posed to me at a job interview.

The origin of the question is Polymeric Composites topic in chapter Polymers of Engineering Chemistry I

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The correct answer is (b) Decrease in surface hardness

The explanation: Improved performance at elevated temperature, decrease in surface hardness, modification in electrical conductivity, improved abrasion resistance are some of the properties of matrix materials which are modified by adding particulate fillers.

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