Technical Articles
Cambridge Polymer Group, Inc. has published these technical articles:
(Plastics, Elastomers and Polymers)
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An estimated twelve million people in the US suffer from degenerative disc disease. Recent therapies involve replacement of the nucleus pulposus (NP) with an artificial material using the existing...
(Plastics, Elastomers and Polymers)
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IOL are often implanted as a replacement for cataract-damaged lenses, or in some cases to change the optical power of the lens. These lenses were originally made from poly(methyl methacrylate) (PMMA)...
(Plastics, Elastomers and Polymers)
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Benzoyl peroxide (BPO) is added to bone cement as a radical initiator for the methyl methacrylate monomer. BPO is highly reactive and degrades readily, with a temperature dependent half-life of one...
(Plastics, Elastomers and Polymers)
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Silly Putty™ is a material that vividly demonstrates the richness and complexity of behavior that apparently simple materials can produce. When first handled, the initial impression given by...
(Plastics, Elastomers and Polymers)
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In 2000, a major recall occurred in the orthopaedic industry where evidence suggested thousands of metallic acetabular shells were failing to properly osseointegrate and were therefore loose....
(Plastics, Elastomers and Polymers)
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The elastic response of rubber-like materials is often based on the Mooney-Rivlin model, which describes the material's stress-strain relationship as a function of two empirically determined constants...
(Plastics, Elastomers and Polymers)
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Traditional strategies for material development can be involved, requiring gradual iteration towards a target set of properties. Design of Experiments (DoE) allows a structured, statistically robust...
(Product and Material Testing)
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This application note discusses the use of FTIR to monitor the curing kinetics of cyanoacrylate adhesives....
(Plastics, Elastomers and Polymers)
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Plastics are ubiquitous in engineering and in many cases have replaced metals. However, plastics can suffer substantially from environmentally induced cracking where the environment in combination...
(Plastics, Elastomers and Polymers)
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The Swell Ratio Tester (SRT™) is an in-house design that allows safe and simple determination of the swelling properties of polymeric materials. The data generated provides insight into...
(Material Fabrication and Processing Services)
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Coating flows are complex rheological processes, involving shear and extension in the deposition region. However, many of the issues with reliable fluid deposition occur after the deposition where...
(Plastics, Elastomers and Polymers)
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The Capillary Breakup Extensional Rheometer (CaBER®) was initially developed at Cambridge Polymer Group under a Small Business Innovation and Research (SBIR) grant. The instrument has since been...
(Plastics, Elastomers and Polymers)
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Analytical techniques for assessing the effects of radiation on UHMWPE....
(Plastics, Elastomers and Polymers)
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A client presented catheter hubs that appeared to be cracking during their manufacturing process. The hubs were compound structures with polycarbonate embedding electronics and the catheter itself. A...
(Plastics, Elastomers and Polymers)
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FTIR Quantification of Absorbed Radiation Dose in Polyethylene...
(Plastics, Elastomers and Polymers)
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Highly crosslinked ultra high molecular weight polyethylene (UHMWPE) has been used in hip and knee replacements since 1998. Although very successful, these materials suffer from significant...
(Plastics, Elastomers and Polymers)
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Cleaning assessment and validation of medical devices has received increased scrutiny from the medical device industry and regulatory agencies in the past 10 years. Cambridge Polymer Group provides...
(Plastics, Elastomers and Polymers)
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Orthopaedic surgeries are some of the most successful interventions currently performed. Hip replacements in particular are now expected to exceed twenty years of use when properly implanted. However,...
(Plastics, Elastomers and Polymers)
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A serious issue for any water-borne craft is that of marine fouling. Seaweed and sea life are remarkably adept at fixing to boat hulls. This condition causes two problems, firstly a substantial loss...
(Plastics, Elastomers and Polymers)
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CPG scientists have developed a formulation of injectable hydrogel that can be used to reinforce human tissue, acting as a bulking agent. CPG hydrogels use a wellrecognized biocompatible synthetic...
(Plastics, Elastomers and Polymers)
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Coefficient of Friction (CoF) is used to quantify how readily two surfaces slide in the presence of a lubricant or oil. Conventional CoF tests use custom built hardware to measure the friction but no...
(Plastics, Elastomers and Polymers)
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Engineers are increasingly turning to so-called smart fluids to solve complex mechanical problems. One specific type of smart fluid is the magnetorheological fluid (MR fluid)which greatly increases...
(Plastics, Elastomers and Polymers)
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Modern polymeric bearing surfaces in orthopaedics are remarkably successful but these materials do not perform well in new tissue sparing procedures where ultra-thin constructs are required. CPG has...
(Plastics, Elastomers and Polymers)
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The third generation ultra-high molecular weight poly(ethylene) (UHMWPE) materials currently being used in orthopaedics, rely on antioxidants to stabilize their properties over time. Until now, no...
(Plastics, Elastomers and Polymers)
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A major complication in total hip replacements is the risk of fracture of the femur as the implant stem is inserted. This fracture can occur intraoperatively in up to 5% of patients and causes serious...
(Plastics, Elastomers and Polymers)
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This application note describes a test method developed at CPG for the identification and quantification of plasticizer in PVC by gas chromatography/mass spectrometry (GC/MS). For a sample mass of...
(Plastics, Elastomers and Polymers)
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Replacing cartilage with a functionally equivalent soft solid is considered a superior treatment for arthritic joints. Cambridge Polymer Group has patented a very low friction elastic hydrogel...
(Biotechnology and Pharmaceutical Services)
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In this paper, we consider the critical mechanical performance parameters for intra-articular hyaluronic products to demonstrate indistinguishable characteristics....
(Plastics, Elastomers and Polymers)
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Determining "dough time" for bone cement is critical for the surgeon operatively, and providing that data on a routine quality control basis is currently complex and expensive. Traditionally, shear...
(Product and Material Testing)
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This note describes the technique and use of small amplitude oscillatory rheometry to measure viscometric properties of polymer solutions and melts, including dynamic modulus, relaxation time, linear...
(Product and Material Testing)
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This application note describes the evolution of free radicals in engine oil due to normal usage in a conventional gasoline engine. It also discusses briefly the process for sampling and determining...
(Product and Material Testing)
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Various techniques to measure yield stress using conventional shear rheometry are discussed & compared....