Polyamide-Polydiene Blends with Ionic Compatibilizers
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Solution Overview
Problem
Existing compositions with polyamide cobalt salts and ionic compatibilizers have a long induction period and poor reactivity with oxygen, necessitating a system that reacts well with oxygen in the presence of an ionic compatibilizer with faster induction times.
Innovation Solution
A composition comprising a polyester, an ionic compatibilizer, a polyamide, a polydiene compound, and a transition metal compound, where the ionic compatibilizer can be derived from sulfoisophthalic acid or its dimethyl ester, and the polyamide to polydiene ratio ranges from 4:1 to 1000:1, with the transition metal compound present in the range of 100 to 15,000 ppm, preferably as a cobalt compound.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If polyamide cobalt salts mixture is used with ionic compatibilizers, then compatibility and processing are improved, but the induction period becomes very long and reactivity with oxygen deteriorates
Solution Approach 1:
The patent introduces a polydiene compound as an intermediary substance that reacts with the ionic compatibilizer to form a complex. This complex acts as a mediator that enables the polyamide-cobalt system to maintain compatibility while achieving faster induction times and improved oxygen reactivity. The polydiene compound facilitates the interaction between the compatibilizer and metal salt, creating an active species that scavenages oxygen more effectively.
Solution Approach 2:
The patent changes the chemical parameters of the system by introducing a polydiene compound with specific functional groups that can react with the ionic compatibilizer. This parameter change transforms the system from a slow-reacting mixture to a fast-reacting complex, altering the induction period and reactivity characteristics while maintaining the compatibility benefits of the ionic compatibilizer.
2Reliability
If polybutadiene is used with cobalt salts and ionic compatibilizers, then oxygen scavenging capability is improved, but the reaction with oxygen becomes very slow and induction period is extended
Solution Approach 1:
The polydiene compound serves as an intermediary that reacts with the ionic compatibilizer to form an active complex. This complex accelerates the oxygen scavenging reaction, reducing the induction period while maintaining the effective oxygen scavenging capability. The polydiene compound acts as a catalyst or activator that enables faster reaction kinetics.
Solution Approach 2:
The polydiene compound performs preliminary action by reacting with the ionic compatibilizer before the main oxygen scavenging process begins. This preliminary reaction forms an active complex that is ready to rapidly scavenge oxygen, effectively reducing the induction period and preparing the system for fast oxygen consumption.
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 composition effectively scavenges oxygen, as demonstrated by zero oxygen ingress in bottles made with specific formulations, showcasing improved reactivity and barrier performance compared to controls.
Implementation Method 1
a transition metal compound... the transition metal compound may be a cobalt compound
Implementation Method 2
the polydiene compound... reacted with the polyamide... effectively scavenges oxygen
Data Source
AI summary
This application discloses the use of polyamide-polydiene blend to improve the oxygen reactivity in the presence of ionic polyester compatibilizers.