I have been writing about engineering plastics for more than 20 years, and I never had heard about any relationship between crystallinity and shish-kebabs. That is, until I saw the May 18 issue of Science magazine. It contains an article indicating that polyolefins crystallize into shish-kebab shapes (I couldn’t make this stuff up).More importantly, the researchers who wrote the article say they know how to manipulate the shape of these “shish-kebabs” so that the polymer structure becomes much stronger. "Our discovery is pertinent to the relatively strong and stiff plastics," says Julia Kornfield, chemical engineering professor at Caltech. "For example, it will allow manufacturers to make polymers for complex and beautifully shaped body panels with equal or better quality than currently available—and cheaper and faster." The lead author of the paper is Shuichi Kimata, a former postdoctoral researcher in Kornfield's Caltech lab. He linked Kornfield's group at Caltech with Yoshinobu Nozue's group at Sumitomo and collaborators at the University of Tokyo. The title of the Science paper is "Molecular Basis of the Shish-Kebab Morphology in Polymer Crystallization." What’s the path to commercialization? What’s the timetable? Or is this just an academic tease? Stay tuned.
Instead of sifting through huge amounts of technical data looking for answers to assembly problems, engineers can now benefit from 3M's new initiative -- 3M Assembly Solutions. The company has organized its wealth of adhesive and tape solutions into six typical application areas, making it easier to find the best products to solve their real-world assembly and bonding problems.
Many of the materials in this slideshow are resins or elastomers, plus reinforced materials, styrenics, and PLA masterbatches. Applications range from automotive and aerospace to industrial, consumer electronics and wearables, consumer goods, medical and healthcare, as well as sporting goods, and materials for protecting food and beverages.
Engineers trying to keep track of the ever-ballooning number of materials and machines for additive manufacturing and 3D printing now have some relief: a free searchable database with more than 350 machines and 450 different materials.
At JEC Europe Dow Automotive introduced a new ultra-fast, under-60-second molding cycle time for its commercial-grade VORAFORCE 5300 epoxy resin matrix for carbon composites. It's aimed at high-volume automotive manufacturing.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.