Iron has a regular or crystalline structure (like a climbing frame with atoms at the corners), while rubber is a polymer (made from long chains of molecules loosely connected together). Or think of water. As you may have discovered, water is an almost unique solid because it expands to ...
In a structureless liquid or randomly oriented polymer bulk, the isotropic part Vff of Vv 1 is given by eq 3. Vf~= Vv 1 -(4/3)Hv (3) Here, the Hv intensity for our sample examined in this paper had no angular dependence (see ref 4). Scattering loss was estimated by integrating ...
Glass Transition Occurence: For polymers, the party is over when the temperature falls close to or below the Tg, and the long-range segmental motion stops. The polymer transforms from being soft and pliable to being hard and brittle when this long-range motion stops. This is when the glass...
What information will differential scanning calorimetry give on glassy polymers? 来自 Wiley 喜欢 0 阅读量: 9 作者:MJ Richardson,NG Savill 摘要: The heat capacity of an amorphous polymer is insensitive to molecular and processing variables except in the glass transition region. Here DSC shows a ...
What information will differential scanning calorimetry give on glassy polymers?doi:10.1002/pi.4980110305The heat capacity of an amorphous polymer is insensitive to molecular and processing variables except in the glass transition region. Here DSC shows a variety of potentially confusing curves that ...
PEEK(Polyetheretherketone) is a colourlessorganic thermoplastic polymer, even though when printed it looks beige-brown (in its Carbon reinforced version, it looks black).Polymersare substances or materials consisting of macromolecules composed of many repeating subunits, called monomers. The molecular stre...
The definition of molecular cooperativity is discussed. The characteristic length of the glass transition describes the size of this cooperativity. Differe... E Donth - 《Journal of Polymer Science Part B Polymer Physics》 被引量: 47发表: 2015年 GLASSY STATE AND THE GLASS TRANSITION This review...
The Tg determines the temperature where the laminate transitions from a rigid, glassy state to a soft, rubbery state. Below Tg, the material is stiff and dimensionally stable. Above Tg, it becomes progressively softer, weaker, and more thermally expansive. A higher Tg means the material retains...
The possible multimodal sorption mechanisms in glassy amorphous poly-ether-ether-ketone (PEEK) are presented. By varying the penetrant-polymer affinity, ex... G.,Mensitieri,M.,... - 《Polymer Engineering & Science》 被引量: 4发表: 1989年 Corrosion protection performance evaluation of low perme...
“Dr. Glassy is the Chief Science Officer of Nascent Biotech, Inc. and the Director and Professor at the Integrated Medical Science Association Foundation. Glassy has held several upper-management positions in commercial biotechnology. He was co-founder and CEO of Shantha West, Inc, a subsidiary ...