Structure and property relations between the polyacrylonitrile-based prestabilized fibers and the partially carbonized fibers

2011 ◽  
pp. n/a-n/a
Author(s):  
Meijie Yu ◽  
Yong Xu ◽  
Chengguo Wang ◽  
Bo Zhu ◽  
Yanxiang Wang ◽  
...  
Keyword(s):  
Structure And Property ◽  
Property Relations

Synthesis and properties of low coefficient of thermal expansion copolyimides derived from biphenyltetracarboxylic dianhydride with p-phenylenediamine and 4,4′-oxydialinine

e-Polymers ◽  
2016 ◽  
Vol 16 (4) ◽  
pp. 295-302 ◽  
Author(s):  
Yonglin Lei ◽  
Yuanjie Shu ◽  
Jinhua Peng ◽  
Yongjian Tang ◽  
Jichuan Huo
Keyword(s):  
Thermal Stability ◽  
Thermal Expansion ◽  
Coefficient Of Thermal Expansion ◽  
Thermomechanical Analysis ◽  
Amic Acid ◽  
Molar Ratio ◽  
Structure And Property ◽  
Property Relations ◽  
Ft Ir ◽  
Biphenyltetracarboxylic Dianhydride

AbstractA series of copolyimides were prepared by thermal imidization of poly(amic acid)s (PAAs) derived from 3,3′,4,4′-biphenyltetracarboxylic dianhydride (s-BPDA), 2,3′,3,4′-biphenyltetracarboxylic dianhydride (a-BPDA), p-phenylenediamine (PDA) and 4,4′-oxydialinine (4,4′-ODA) commonly used for the production of commercial polyimides. The flexible copolyimide films were obtained from that the molar ratio of s-BPDA, a-BPDA, PDA and 4,4′-ODA was 9:1:8:2 (Co-PIs-3), 8:2:9:1 (Co-PIs-5) and 8:2:8:2 (Co-PIs-6). These obtained copolyimide films were characterized by Fourier transform-infrared spectroscopy(FT-IR), wide angle X-ray (WAXD), Thermogravimetric (TG), dynamic mechanical thermal analysis (DMA), thermomechanical analysis (TMA), field-emission scanning electron microscopy (FE-SEM) and mechanical properties measurement. The results showed that three copolyimides remained semi-crystalline and exhibited high glass transition temperature (Tg), high thermal stability, great ultimate tensile strength and low coefficient of thermal expansion (CTE). The Co-PIs-5 had lower crystallinity, lower CTE, greater elongation at break, higher Tg and thermal stability and the greater dense extent, compared with Co-PIs-3 and Co-PIs-6. Structure and property relations of the prepared polyimides were also briefly discussed. The results revealed that the copolymerization of s-BPDA/PDA with a small number of 4,4′-ODA/a-BPDA was a useful means for enhancing flexibility without sacrificing low CTE.

Study on structure and property relations of α-iPP during uniaxial deformation via in situ synchrotron SAXS/WAXS and POM investigations

2017 ◽  
Vol 58 (2) ◽  
pp. 160-169
Author(s):  
Yingrui Shang ◽  
Puqing Ning ◽  
Yao Zhang ◽  
Feifei Xue ◽  
Ziwei Cai ◽  
...  
Keyword(s):  
Uniaxial Deformation ◽  
Structure And Property ◽  
Property Relations ◽  
Synchrotron Saxs

Long chain alkanesulfonates and 1-hydroxy-2-alkanesulfonates: Structure and property relations

1963 ◽  
Vol 40 (10) ◽  
pp. 538-541 ◽  
Author(s):  
J. K. Weil ◽  
F. D. Smith ◽  
A. J. Stirton ◽  
R. G. Bistline
Keyword(s):  
Structure And Property ◽  
Property Relations ◽  
Long Chain

scholarly journals Predicting structure and property relations in polymeric photovoltaic devices

2006 ◽  
Vol 74 (8) ◽  
Author(s):  
Gavin A. Buxton ◽  
Nigel Clarke
Keyword(s):  
Photovoltaic Devices ◽  
Structure And Property ◽  
Property Relations

Effect of Mold Temperature on Structure and Property Variations of PBT Injection Moldings in the Thickness Direction

2004 ◽  
Vol 19 (3) ◽  
pp. 303-307 ◽  
Author(s):  
M. Shibaya ◽  
H. Ishihara ◽  
K. Yamashita ◽  
N. Yoshihara ◽  
C. Nonomura
Keyword(s):  
Mold Temperature ◽  
Thickness Direction ◽  
Structure And Property

Property in Land in Roman Provinces

2018 ◽  
Author(s):  
Georgy Kantor
Keyword(s):  
Local Property ◽  
Legal Tradition ◽  
Technical Literature ◽  
Historical Scholarship ◽  
Property Relations ◽  
Roman Provinces ◽  
Legal Regimes ◽  
The Right ◽  
Property Regimes

Roman concept of dominium has been fundamental in the formation of concepts of ownership in European legal tradition. It is, however, often considered outside the context of Roman imperial rule and of the multiplicity of legal regimes governing property relations in Roman provinces outside Italy. This chapter starts from the classic passage in the Institutes of Gaius, claiming that the right of dominium did not exist in provincial land, where it belonged to the Roman state. Gaius’ statement is often dismissed in modern historical scholarship as a ‘conveyancer’s fantasy’ (A.H.M. Jones). It is argued here that, on the contrary, this passage and other similar statements in Roman juristic literature and technical literature on land-measurement, show an important facet of Roman ideas of ownership as a socially contingent right, dependent on civic status of the owner, status of the territory within the empire, and Roman recognition of local property regimes.

scholarly journals Challenging the State: Devolutionary Tenure Transitions for Saving and Expanding Forests

Human Ecology ◽  
2021 ◽  
Author(s):  
Liz Alden Wily
Keyword(s):  
Rural Communities ◽  
Property Rights ◽  
Protected Areas ◽  
Forest Cover ◽  
Biological Diversity ◽  
Convention On Biological Diversity ◽  
Property Relations ◽  
The Will ◽  
Customary Land

AbstractI address a contentious element in forest property relations to illustrate the role of ownership in protecting and expanding of forest cover by examining the extent to which rural communities may legally own forests. The premise is that whilst state-owned protected areas have contributed enormously to forest survival, this has been insufficiently successful to justify the mass dispossession of customary land-owning communities this has entailed. Further, I argue that state co-option of community lands is unwarranted. Rural communities on all continents ably demonstrate the will and capacity to conserve forests – provided their customary ownership is legally recognized. I explore the property rights reforms now enabling this. The replication potential of community protected forestlands is great enough to deserve flagship status in global commitments to expand forest including in the upcoming new Convention on Biological Diversity (CBD).

scholarly journals Jaws of Platynereis dumerilii: Miniature Biogenic Structures with Hardness Properties Similar to Those of Crystalline Metals

JOM ◽  
2021 ◽  
Author(s):  
Luis Zelaya-Lainez ◽  
Giuseppe Balduzzi ◽  
Olaf Lahayne ◽  
Kyojiro N. Ikeda ◽  
Florian Raible ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Indentation Depth ◽  
Organic Matrix ◽  
Structure Property ◽  
Structural Protein ◽  
Inductively Coupled ◽  
Property Relations ◽  
Biogenic Structures ◽  
Platynereis Dumerilii ◽  
Bristle Worms

AbstractNanoindentation, laser ablation inductively coupled plasma mass spectroscopy and weighing ion-spiked organic matrix standards revealed structure-property relations in the microscopic jaw structures of a cosmopolitan bristle worm, Platynereis dumerilii. Hardness and elasticity values in the jaws’ tip region, exceeding those in the center region, can be traced back to more metal and halogen ions built into the structural protein matrix. Still, structure size appears as an even more relevant factor governing the hardness values measured on bristle worm jaws across the genera Platynereis, Glycera and Nereis. The square of the hardness scales with the inverse of the indentation depth, indicating a Nix-Gao size effect as known for crystalline metals. The limit hardness for the indentation depth going to infinity, amounting to 0.53 GPa, appears to be an invariant material property of the ion-spiked structural proteins likely used by all types of bristle worms. Such a metal-like biogenic material is a major source of bio-inspiration.

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