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In the present research, the complete dissolution of carrageenan was realized by using NaOH aqueous solution and the corresponding mechanism was successfully revealed. The properties of carrageenan solution prepared in NaOH aqueous solution were comprehensively studied by gel temperature, differential scanning calorimetry and dynamic light scattering. The intra- and intermolecular interactions of...
In situ synchrotron small angle X-ray scattering (SAXS) and wide angle X-ray diffraction (WAXD) were carried out to study the lamellar and crystalline structural evolutions of poly(ethylene terephthalate) (PET) fiber during cold (20 °C) and hot (200 °C) drawing. The stress-strain curves were divided into two zones, i.e. linearly stress developing zone (zone I) and yield zone around fracture (zone...
The deformation-induced microstructure evolution of self-associated polymer blends, i.e., long chain polyamide alloys (LCPAs), was investigated and correlated with their mechanical performance. A PA1012 (soft phase)/PA612 (hard phase) blend was selected for this study. It is interesting that both Young's modulus and yield stress exhibit a nearly linear dependence with composition, which follows a...
The evolutions in lamellar and fibrillar structures of poly(ethylene terephthalate) (PET) industrial fiber during taut-ends thermal annealing were investigated mainly using synchrotron radiation small-angle X-ray scattering (SAXS). Wide-angle X-ray diffraction (WAXD) and differential scanning calorimetry (DSC) results indicated that high modulus and low shrinkage PET fiber (HMLS) had high crystallinity...
Deformation-induced microstructure evolution of Polyamide 1012, with an emphasis on lamella development, polymorphism transition and molecular orientation, is investigated. When deformed above Tg (100 °C), a series of complex SAXS patterns are continuously identified at intermediate strain including four-point pattern, figure-8 pattern and X-shaped pattern, accompanied with two-bar pattern on the...
The present work deals with the flow-induced multiple orientations and crystallization structure of polymer melts under a complex flow field. This complex flow field is characteristic of the consistent coupling of extensional “pulse” and closely followed shear flow in a narrow channel. Utilizing an ingenious combination of an advanced micro-injection device and long chain aliphatic polyamides (LCPA),...
Transamidation between PA1012 and PA612 was investigated with combination techniques including differential scanning calorimetry (DSC), rheometry, nuclear magnetic resonance (NMR) and variable-temperature Fourier transform infrared spectroscopy (VT-FTIR). Based on the increase of storage modulus with sweep time, the presence of reactive chain ends were proved, promoting chain growth in either polyamide...
A series of carboxylic acid functionalized hybrid linear-dendritic block copolymers (LDBCs) derived from methoxy poly(ethylene glycol) (MPEG) and variant generation dendrons from 2,2-bis(hydroxymethyl) propionic acid were synthesized and employed as CaCO 3 crystallization growth modifiers. Mainly spherical vaterite particles of gradually reduced sizes were produced with the increase of the...
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