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← ScienceWhich risk increases when injection-molded polymer films experience thermal gradients?
A)Undesired thin-film interference fringes✓
B)Increased molecular cross-linking density
C)Elevated glass transition temperature
D)Reduced polymer chain entanglement
💡 Explanation
Thermal gradients during cooling exacerbate thickness variations, driving increased thin-film interference because optical path differences change with temperature; therefore fringes appear, rather than uniform optical properties, because thicknesses are uneven.
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