Tableting process-induced solid-state polymorphic transition

2022 ◽  
Author(s):  
Heejun Park ◽  
Jeong-Soo Kim ◽  
Seongwoo Hong ◽  
Eun-Sol Ha ◽  
Haichen Nie ◽  
...  
Keyword(s):  
Solid State ◽  
Polymorphic Transition

scholarly journals Surface-Induced Frustration in Solid State Polymorphic Transition of Native Cellulose Nanocrystals

2017 ◽  
Vol 18 (6) ◽  
pp. 1975-1982 ◽  
Author(s):  
Reeta Salminen ◽  
Niki Baccile ◽  
Mehedi Reza ◽  
Eero Kontturi
Keyword(s):  
Solid State ◽  
Cellulose Nanocrystals ◽  
Polymorphic Transition ◽  
Native Cellulose

scholarly journals Thorough investigation on the high-temperature polymorphism of dipentyl-perylenediimide: thermal expansion vs polymorphic transition.

2021 ◽  
Author(s):  
Francesco Marin ◽  
Serena Tombolesi ◽  
Tommaso Salzillo ◽  
Omer Yaffe ◽  
Lucia Maini
Keyword(s):  
Thermal Expansion ◽  
High Temperature ◽  
Solid State ◽  
Thermal Behaviour ◽  
Variable Temperature ◽  
Negative Thermal Expansion ◽  
Thermal Characterization ◽  
Polymorphic Transition ◽  
State Transitions ◽  
Scanning Calorimetry

N,N’-dipentyl-3,4,9,10-perylendiimide (PDI-C5) is an organic semiconducting material which has been extensively investigated as model compound for its optoelectronic properties. It is known to be highly thermally stable, that it exhibits solid-state transitions with temperature and that thermal treatments lead to an improvement in its performance in devices. Here we report a full thermal characterization of PDI-C5 by combination of differential scanning calorimetry, variable temperature X-ray diffraction, hot stage microscopy, and variable temperature Raman spectroscopy. We identified two high temperature polymorphs, form II and form III, which form respectively at 112 °C and at 221 °C and we determined their crystal structure from powder data. Form II is completely reversible upon cooling with low hysteresis, while form III revealed a different thermal behaviour upon cooling depending on the technique and crystal size. The crystal structure’s features of the different polymorphs are discussed and compared, and we looked into the role of the perylene core and alkyl chains during solid-state transitions. The thermal expansion principal axis of PDI-C5 crystal forms is reported showing that all the reported forms possess negative thermal expansion (X1) and large positive thermal expansion (X3) which are correlated to thermal behaviour observed.

Phenomena and Kinetics of Solid-State Polymorphic Transition of Caffeine

2010 ◽  
Vol 10 (7) ◽  
pp. 2916-2920 ◽  
Author(s):  
Yoshifumi Kishi ◽  
Masakuni Matsuoka
Keyword(s):  
Solid State ◽  
Polymorphic Transition ◽  
Kinetics Of

Solid-State Polymorphic Transition of Theophylline Anhydrate and Humidity Effect

2007 ◽  
Vol 7 (2) ◽  
pp. 411-415 ◽  
Author(s):  
Kimihiro Matsuo ◽  
Masakuni Matsuoka
Keyword(s):  
Solid State ◽  
Polymorphic Transition ◽  
Humidity Effect

Kinetics of Solid State Polymorphic Transition of Caffeine

2007 ◽  
Vol 40 (6) ◽  
pp. 468-472 ◽  
Author(s):  
Kimihiro Matsuo ◽  
Masakuni Matsuoka
Keyword(s):  
Solid State ◽  
Polymorphic Transition ◽  
Kinetics Of

Thermodynamic Examination of the Polymorphic Transition of Trans-1,4-Polybutadiene. I. Theoretical Premises

1968 ◽  
Vol 41 (3) ◽  
pp. 576-585
Author(s):  
G. Natta ◽  
M. Pegoraro ◽  
L. Sziálgyi
Keyword(s):  
Solid State ◽  
Applied Stress ◽  
Thermal Energy ◽  
State Transition ◽  
Theoretical Study ◽  
Axial Stress ◽  
Thermodynamic Cycle ◽  
Polymorphic Transition ◽  
Cyclic Process ◽  
Solid State Transition

Abstract It is known that oriented fibers of trans-1,4-polybutadiene shrink when heated, in correspondence with the solid-solid state transition. In ideal fibers this occurs at a temperature which is solely a function of applied stress. The possibility of converting thermal energy into mechanical work by a cyclic process is examined, for an ideal fiber, on the basis of the contraction taking place under a predetermined axial stress at the corresponding temperature, and a subsequent elongation occurring at lower temperatures, under an axial stress which is either zero or lower than the previous one. A theoretical study is made of a possible thermodynamic cycle, and the resulting efficiency is calculated.

Solid-State Polymorphic Transition and Solvent-Free Self-Assembly in the Growth of Organic Crystalline Microfibers

2008 ◽  
Vol 8 (1) ◽  
pp. 11-13 ◽  
Author(s):  
Daniela. S. Tsekova ◽  
Beatriu Escuder ◽  
Juan F. Miravet
Keyword(s):  
Solid State ◽  
Self Assembly ◽  
Polymorphic Transition ◽  
Solvent Free
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