Aliphatic Polycarbonate Functionalization
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Solution Overview
Problem
Aliphatic polycarbonates with introduced functional groups often impair their excellent thermal decomposition properties, limiting their applications due to reduced affinity for other materials.
Innovation Solution
An aliphatic polycarbonate with a specific structure, comprising a constituent unit represented by formula (1) and formula (2), where the content of the constituent unit is between 0.1 mol% and 1.5 mol%, and having a mass average molecular weight of 60000 or more and 1000000 or less, which maintains excellent thermal decomposition properties while incorporating a functional group in a side chain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If functional groups are introduced into aliphatic polycarbonates to improve affinity for other materials, then reactivity and affinity are enhanced, but thermal decomposition properties are impaired
Solution Approach 1:
The patent introduces functional groups at specific local positions (side chains) rather than throughout the entire polymer structure. The constituent unit with formula (1) containing the functional group in the side chain is incorporated in controlled amounts (0.1-10 mol%) to provide localized reactivity and affinity enhancement while preserving the overall thermal decomposition characteristics of the main polymer chain.
2Adaptability or versatility
If functional groups are introduced into aliphatic polycarbonates to enhance reactivity, then application range is expanded, but residue after thermal decomposition increases
Solution Approach 1:
The patent carefully controls the concentration parameter of the functional group-containing constituent unit to be within 0.1-10 mol% of the total constituent units. This parameter optimization ensures sufficient reactivity and affinity for expanded applications while maintaining minimal residue after thermal decomposition, as the low concentration of functional groups does not significantly affect the overall decomposition behavior.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The aliphatic polycarbonate retains its excellent thermal decomposition property while enhancing reactivity and affinity for other materials, enabling a wider range of applications.
Implementation Method 1
aliphatic polycarbonates, which are thermally decomposed at low temperatures under both an air atmosphere and an inert atmosphere, leaving almost no residue
Data Source
AI summary
An object of this invention is to find a method for introducing a functional group into an aliphatic polycarbonate without impairing the excellent thermal decomposition property of the aliphatic polycarbonate.An aliphatic polycarbonate comprising a constituent unit represented by formula (1):wherein R1, R2, and R3 are identical or different, and each represents a hydrogen atom, a C1-10 alkyl group optionally substituted with one or more substituents, or a C6-20 aryl group optionally substituted with one or more substituents, wherein two groups from among R1 to R3, taken together with the carbon atom or carbon atoms to which these groups are attached, may form a substituted or unsubstituted, saturated or unsaturated 3- to 10-membered aliphatic ring; and X represents a divalent group containing one or more heteroatoms or an alkylene group having 3 or more carbon atoms, anda constituent unit represented by formula (2):wherein R4, R5, R6, and R7 are identical or different, and each represents a hydrogen atom, a C1-10 alkyl group optionally substituted with one or more substituents, or a C6-20 aryl group optionally substituted with one or more substituents, wherein two groups from among R4 to R7, taken together with the carbon atom or carbon atoms to which these groups are attached, may form a substituted or unsubstituted, saturated or unsaturated 3- to 10-membered aliphatic ring,the content of the constituent unit represented by formula (1) being 0.1 mol % or more and 1.5 mol % or less, based on the total amount of the constituent units of formula (1) and formula (2).