<%@LANGUAGE=VBScript %> <%Set asplObj=Server.CreateObject("ASPL.Login") asplObj.Protect Set asplObj=Nothing %> Interpenetrating Networks (IPN)/Notes

Maro Publications

Interpenetrating Networks

11/09/2013**
from 10/19/2011

                                       Notes

                                   Patent Titles

                                 Patent Abstracts

Composites

Materials

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Patent Titles

10/29/2013

4. 8,568,891  
Thermosetting resin composition of semi-IPN composite, and varnish, prepreg and metal clad laminated board using the same 

9/17/2013

3. 8,536,250 
Geopolymer and epoxy simultaneous interpenetrating polymer network composition, and methods for the same 

9/3/2013

2. 8,524,886 
Outer layer having entanglement of hydrophobic polymer host and hydrophilic polymer guest 

1. 8,524,884 
Outer layer material having entanglement of hydrophobic polymer hostblended with a maleated hydrophobic polymer co-host, and hydrophilic polymer guest 

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Notes

“An interpenetrating polymer network (IPN) is a polymer comprising two or more networks which are at least partially interlaced on a polymer scale but not covalently bonded to each other. The network cannot be separated unless chemical bonds are broken.[1] The two or more networks can be envisioned to be entangled in such a way that they are concatenated and cannot be pulled apart, but not bonded to each other by any chemical bond.”

“Simply mixing two or more polymers does not create an interpenetrating polymer network (polymer blend), nor does creating a polymer network out of more than one kind of monomers which are bonded to each other to form one network (heteropolymer or copolymer).”

“There are semi-interpenetrating polymer networks (SIPN) and pseudo-interpenetrating polymer networks.

“To prepare IPNs and SIPNs, the different components are formed simultaneously or sequentially.”

(Wikipedia, Interpenetrating Networks, 10/20/2011)

US Patents

Journal Articles

Review Articles

Comments

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Patent Abstracts

Accelerated Self-Healing Via Ternary Interpenetrating Microvascular Networks
(4320–4326)  Advanced Functional Materials 21  #22 (2011)
Hansen et al of the University of Illinois at Urbana-Champaign, Illinois, developed self-healing materials with dual interpenetrating microvascular networks which enable two-part healing chemistries and repeated healing of damage in a localized region.   However, due to slow healing kinetics, multiple days are required between damage events to recover mechanical performance under ambient conditions.  By directly writing a third interdigitated microvascular network within these epoxy coating/substrate architectures to enable in situ thermal regulation, the characteristic healing time is reduced by an order of magnitude.  Specifically, this third network provides a conduit for circulating a temperature-controlled fluid that rapidly heats the locally damaged region leading to a sharp reduction in the time required for mechanical property restoration.  (RDC 11/16/2011)

Cellulose acetate/poly(methyl methacrylate) interpenetrating networks: synthesis and estimation of thermal and mechanical properties
(1441-1454)
Cellulose 18 #6 (2011)
Aoki, Teramoto and Nishio of Kyoto University, Japan, synthesized IPN-type composites consisting of cellulose acetate (CA) and poly(methyl methacrylate; PMMA) in film form. In this synthesis, a mercapto group (SH)-containing CA, CA-MA, was prepared in advance by esterification of CA with mercaptoacetic acid, and then intercomponent cross-linking between CA-MA and PMMA was attained by thiol–ene polymerization of methyl methacrylate (MMA) onto the CA-MA substrate.  For comparison, polymer synthesis was also attempted to produce a semi-IPN type of composites comprising CA and cross-linked PMMA, via copolymerization of MMA and ethylene glycol dimethacrylate as cross-linker in a homogeneous system containing CA solute.  It was shown that the specific IPN technique using thiol–ene reactions usually resulted in a much better compatibility-enhanced polymer composite, which exhibited a higher tensile strength and even an outstanding ductility without parallel in any film sample of CA, PMMA, and their physical blends.  (RDC 11/9/2011)

Enhanced adsorption properties of interpenetrating polymer network hydrogels for heavy metal ion removal
(1709-1720)
Polymer Bulletin 67 #8 (2011)
Wang, Liu and Wei of Yancheng Institute of Technology, China, prepared sequential interpenetrating polymer network (IPN) hydrogels based on poly(polyethylene glycol diacrylate) poly(PEGDA) and poly(methacrylic acid) (PMAA) with enhanced adsorption properties for heavy metal ion removal.  The swelling ratio increased, and mechanical strength decreased with the PMAA content in the IPN.  The IPN hydrogels were used to remove heavy metal ions from aqueous solution under the non-competitive condition.  The results indicated that the adsorption capacity of the IPN hydrogels increased with the pH values and PMAA content in the IPN.  Furthermore, the synergistic complexation of metal ions with two polymer networks in the IPN was found in the adsorption studies. Regeneration studies suggested that metal rebinding capacity of the IPN hydrogels did not change significantly through repeated applications compared with the first run. It was concluded that the poly(PEGDA)/PMAA hydrogels could be used as fast-responsive, high capacity, and renewable sorbent materials in heavy metal removing processes.  (RDC 10/19/2011)

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Roger D. Corneliussen
Editor
Telephone: 610 883 3473
cornelrd@bee.net
www.maropolymeronline.com

Copyright 2011 by Roger D. Corneliussen

**Date of latest addition. First entry was added 10/19/2011.