Chemistry Industrial Chemistry PMDC Conceptual Practice
PMDC Verified Question 4 of 41
What is the primary function of incorporating inert inorganic fillers, such as talc or fumed silica, into an adhesive formulation?
A
To catalyze free-radical decomposition and lower the glass transition temperature
B
To increase optical transparency and maximize electrical conductivity
C
To modify rheological viscosity, minimize shrinkage, and reduce formulation cost
D
To convert linear thermoplastic polymers into flexible elastomeric foams
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: To modify rheological viscosity, minimize shrinkage, and reduce formulation cost
Concept:

Inorganic particulate fillers are compounding additives utilized to regulate rheology, reduce cure shrinkage, and optimize mechanical properties of polymer matrices.

Formula / Reaction:

$$\text{Volumetric Cure Shrinkage (\%)} \propto (1 - \phi_{\text{filler}})$$

Solution:

  • Fillers modify thixotropy and viscosity, preventing adhesive sag on vertical surfaces.


  • They reduce cure shrinkage and thermal expansion mismatch while lowering raw material costs.


Why other options are incorrect:

  • Option A: Inert fillers do not act as chemical polymerization initiators.


  • Option B: Mineral particulates scatter light (increasing opacity) and act as electrical insulators.


  • Option D: Chemical blowing agents, not mineral fillers, produce polymer foams.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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