Achieving highly crystalline rate and crystallinity in Poly(l-lactide) via in-situ melting reaction with diisocyanate and benzohydrazine to form nucleating agents

2020 ◽  
Vol 81 ◽  
pp. 106216 ◽  
Author(s):  
Ji-Hong Liu ◽  
Jie-Hua Cai ◽  
Xiao-Hong Tang ◽  
Yun-Xuan Weng ◽  
Ming Wang
Keyword(s):  
Nucleating Agents ◽  
Melting Reaction

Morphological diagram of a nucleating agent/poly(ε-caprolactone) and an in situ barrier strategy

RSC Advances ◽  
2015 ◽  
Vol 5 (97) ◽  
pp. 79687-79690 ◽  
Author(s):  
Siqi Wu ◽  
Rui Han ◽  
Min Nie ◽  
Qi Wang
Keyword(s):  
Nucleating Agent ◽  
Nucleating Agents ◽  
Barrier Strategy

A temperature/composition morphological diagram of nucleating agent/poly(ε-caprolactone) blends to direct in situ formation of flake nucleating agents was constructed.

Constraining the timing and character of crustal melting in the Adirondack Mountains using multi-scale compositional mapping and in-situ monazite geochronology

2019 ◽  
Vol 104 (11) ◽  
pp. 1585-1602 ◽  
Author(s):  
Michael L. Williams ◽  
Timothy Grover ◽  
Michael J. Jercinovic ◽  
Sean P. Regan ◽  
Claire R. Pless ◽  
...  
Keyword(s):  
Tectonic Setting ◽  
Bulk Composition ◽  
Previous History ◽  
Melting Reaction ◽  
Tectonic History ◽  
Three Samples ◽  
Accessory Phase ◽  
Close Proximity ◽  
Orogenic Belts

Abstract Migmatites are common in the hinterland of orogenic belts. The timing and mechanism (in situ vs. external, P-T conditions, reactions, etc.) of melting are important for understanding crustal rheology, tectonic history, and orogenic processes. The Adirondack Highlands has been used as an analog for mid/deep crustal continental collisional tectonism. Migmatites are abundant, and previous workers have interpreted melting during several different events, but questions remain about the timing, tectonic setting, and even the number of melting events. We use multiscale compositional mapping combined with in situ geochronology and geochemistry of monazite to constrain the nature, timing, and character of melting reaction(s) in one locality from the eastern Adirondack Highlands. Three gray migmatitic gneisses, studied here, come from close proximity and are very similar in microscopic and macroscopic (outcrop) appearance. Each of the rocks is interpreted to have undergone biotite dehydration melting (i.e., Bt + Pl + Als + Qz = Grt + Kfs + melt). Full-section compositional maps show the location of reactants and products of the melting reaction, especially prograde and retrograde biotite, peritectic K-feldspar, and leucosome, in addition to all monazite and zircon in context. In addition, the maps provide constraints on kinematics during melting and a context for interpretation of accessory phase composition and geochronology. More so than zircon, monazite serves as a monitor of melting and melt loss. The growth of garnet during melting leaves monazite depleted in Y and HREEs while melt loss from the system leaves monazite depleted in U. Results show that in all three localities, partial melting occurred during at ca. 1160–1150 Ma (Shawinigan orogeny), but the samples show high variability in the location and degree of removal of the melt phase, from near complete to segregated into layers to dispersed. All three localities experienced a second high-T event at ca. 1050 Ma, but only the third (non-segregated) sample experienced further melting. Thus, in addition to bulk composition, the fertility for melting is an important function of the previous history and the degree of mobility of earlier melt and fluids. Monazite is also a sensitive monitor of retrogression; garnet breakdown leads to increased Y and HREE in monazite. Results here suggest that all three samples remained at depth between the two melting events but were rapidly exhumed after the second event.

Nanohybrid Polymeric Nucleating Agents: In Situ Decorated Carbon Nanotubes and Serial Nucleation Behaviors in a Melt-Miscible Crystalline/Crystalline Blend

2015 ◽  
Vol 216 (17) ◽  
pp. 1801-1807 ◽  
Author(s):  
Lijun Ye ◽  
Cuicui Ye ◽  
Xianchun Shi ◽  
Hengti Wang ◽  
Hongyan Zhao ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Nucleating Agents

Nanocomposites with functionalized carbon nanotubes

2003 ◽  
Vol 788 ◽  
Author(s):  
Shamal K. Mhetre ◽  
Yong. K. Kim ◽  
Steven. B. Warner ◽  
Prabir. K. Patra ◽  
Phaneshwar Katangur ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Crystallization Behavior ◽  
Nylon 6 ◽  
Interfacial Region ◽  
Nucleating Agents ◽  
Dsc Analysis ◽  
Functionalized Carbon Nanotubes ◽  
Good Dispersion ◽  
In Situ Technique

ABSTRACTThe main issues related with preparation of nanocomposites are dispersion, alignment and adhesion between carbon nanotubes and matrix. We are designing an approach where these issues are fully addressed. We combined a functionalization approach with in-situ technique of nanocomposites preparation. A good dispersion and intercalation of carbon nanotubes were observed in the prepared nanocomposites. A presence of strong interfacial region was also noted. It is also found that orientation of carbon nanotubes inside matrix can be done by mechanically stretching of nanocomposites. DSC analysis shows that inclusion of carbon nanotubes affects crystallization behavior of nylon 6 significantly and it is found that CNTs acts as nucleating agents.

Rendez vous with Saturn's rings

1984 ◽  
Vol 75 ◽  
pp. 743-759 ◽  
Author(s):  
Kerry T. Nock
Keyword(s):  
Solar Energy ◽  
Electric Propulsion ◽  
Power Source ◽  
Propulsion System ◽  
Low Thrust ◽  
Ring Plane ◽  
The Earth ◽  
Total Impulse ◽  
Saturn's Rings

ABSTRACTA mission to rendezvous with the rings of Saturn is studied with regard to science rationale and instrumentation and engineering feasibility and design. Future detailedin situexploration of the rings of Saturn will require spacecraft systems with enormous propulsive capability. NASA is currently studying the critical technologies for just such a system, called Nuclear Electric Propulsion (NEP). Electric propulsion is the only technology which can effectively provide the required total impulse for this demanding mission. Furthermore, the power source must be nuclear because the solar energy reaching Saturn is only 1% of that at the Earth. An important aspect of this mission is the ability of the low thrust propulsion system to continuously boost the spacecraft above the ring plane as it spirals in toward Saturn, thus enabling scientific measurements of ring particles from only a few kilometers.

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