Ester-Amide Multi-Block Copolymer for Strength and Moldability
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Solution Overview
Problem
Existing block copolymers, such as those described in PTLs 1 to 3 and NPL 1, lack practical applications due to inadequate moldability, despite having desirable properties like high heat resistance and mechanical strength.
Innovation Solution
A multi-block copolymer is developed by combining aliphatic polyester and polyamide through ring-opening polymerization, allowing for adjustment of blend ratios to enhance moldability and achieve specific physical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If block copolymers are produced using conventional methods (PTLs 1-3, NPL 1), then high heat resistance and mechanical strength are achieved, but moldability is insufficient for practical application
Solution Approach 1:
The copolymer is segmented into distinct blocks: a polyamide block (obtained through ring-opening polymerization of cyclic lactam) and a polyester block (containing hydroxyl or carboxyl groups). This segmentation allows each block to contribute its specific properties - the polyamide block provides mechanical strength and heat resistance, while the polyester block enhances moldability. The block structure enables practical application by combining complementary properties in separate functional segments.
Solution Approach 2:
The invention creates a composite block copolymer material combining polyamide and polyester blocks. The polyamide block (from cyclic lactam ring-opening polymerization) and polyester block (with hydroxyl or carboxyl groups) form a composite structure where each component contributes its advantageous properties. This composite approach resolves the contradiction by integrating materials with complementary characteristics - high strength from polyamide and good moldability from polyester.
2Strength
If polyamide 4 is used to achieve biodegradability and high mechanical strength, then excellent material properties are obtained, but moldability remains limited
Solution Approach 1:
The invention merges polyamide 4 (or other cyclic lactam polymers) with polyester components containing hydroxyl or carboxyl groups to form a block copolymer. The polyamide block provides biodegradability and high mechanical strength, while the polyester block contributes improved moldability. This merging creates a unified material that achieves both high strength and good moldability, enabling practical application of biodegradable high-performance polymers.
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 resulting copolymer exhibits excellent moldability and physical properties suitable for various applications, leveraging the biodegradability and mechanical strength of polyamide 4 and the moldability of polybutylene succinate.
Implementation Method 1
a multi-block copolymer including a polyester-containing block and a polyamide-containing block obtained through ring-opening polymerization of a cyclic lactam
Implementation Method 2
polyamide-containing block obtained through ring-opening polymerization of a cyclic lactam
Data Source
AI summary
Provided is an ester-amide multi-block copolymer represented by formula (1), which comprises a block containing a polyester and a block containing a polyamide obtained through ring opening polymerization of a cyclic lactam. (R1 and R2 each denote a hydrogen atom or a substituent group-containing alkyl chain having 1-20 carbon atoms, and R3 denotes a hydrogen atom or a substituent group-containing alkyl chain having 1-10 carbon atoms. In addition, R4 is an aromatic hydrocarbon chain that does, or does not, contain a heteroatom or an aliphatic hydrocarbon chain that does, or does not, contain a hetero atom. Y is NH, O or S. Furthermore, m denotes an integer between 1 and 60, n denotes an integer between 1 and 120, 1 denotes an integer between 2 and 100, and x denotes an integer between 1 and 11).