Colorless Polyimides Derived from Novel Role-Dividing <i>Spiro</i>-Type Monomers: Strategies to Overcome the Trade-Off Between Low Linear Coefficients of Thermal Expansion and Low Thickness-Direction Birefringence Without Fillers.

Polymers (Basel) · 2026 · PMC13165796 · PMID 42122732

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Moreover, low-CTE characteristics (demand (vi)) originate from a great extent of main-chain in-plane orientation induced during thermal imidization [ 61 , 62 , 63 , 64 ], which has a strong trend to increase as their structural linearity/rigidity increases [ 49 , 50 , 51 ].

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Colorless Polyimides Derived from Novel Role-Dividing &lt;i&gt;Spiro&lt;/i&gt;-Type Monomers: Strategies to Overcome the Trade-Off Between Low Linear Coefficients of Thermal Expansion and Low Thickness-Direction Birefringence Without Fillers.

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Colorless Polyimides Derived from Novel Role-Dividing <i>Spiro</i>-Type Monomers: Strategies to Overcome the Trade-Off Between Low Linear Coefficients of Thermal Expansion and Low Thickness-Direction Birefringence Without Fillers.