2012年12月1日 · In this form, starch is an amorphous and highly plasticized polymer. It was found that the dispersed phase size reduction, obtained through interfacial modification, had a significant influence on PLA crystallinity.

2017年3月26日 · Detailed knowledge of the organization of amorphous and crystalline phases in a semicrystalline polymer such as poly (l -lactic acid) (PLLA) is crucial for complete understanding and prediction of its physical properties.

2021年1月6日 · Poly (lactic acid), a promising biodegradable polymer, is restricted by poor heat resistance, which is determined by the crystallization. It is important to expound the relationship between crystal structure and thermal, mechanical performance.

amorphous polymer by rapid cooling or by varying the chain structure, as detailed below. In these cases, the polymer has a single amorphous fraction, the MA fraction. Therefore, the thermal properties of the amorphous fractions of PLLA are discussed separately in this chapter for the amorphous and semicrystalline polymers. 2 Amorphous Poly ...

2007年11月22日 · Effects of the crystallization temperature on the crystal structure and its melting behavior of poly (l -lactic acid) (PLLA) have been investigated by means of wide-angle (WAXS) and small-angle (SAXS) X-ray scattering, optical microscopy, and differential scanning calorimetory (DSC).

2011年8月10日 · Similar to other biodegradable polyesters, PLLA displays crystal polymorphism, as three main different crystal modifications can develop, named α, β, and γ forms, depending on preparation conditions. The α form of PLLA grows upon …

2024年10月23日 · The cold-crystallization and crystal evolution of amorphous poly (lactic acid) (PLA) are analyzed during multistep tensile deformation and annealing at 70°C using in situ synchrotron wide-angle X-ray scattering (WAXS) measurements. The 2D-WAXS diffraction pattern reveals that the PLA crystalline structure forms perpendicular to the draw direction.

2024年4月15日 · Three characteristic regions can be distinguished: the amorphous phase, separated circular spherulite, and partially connected spherulites. The extended analysis of the alignment of macromolecules both in-plane and out-of-plane is …

2018年10月19日 · Crystallization of amorphous poly (L-lactic acid) (PLLA)/poly (D-lactic acid) (PDLA) blend has been investigated by immersion in various organic solvents, acetone, ethyl acetate, tetrahydrofuran (THF), toluene, o -xylene, o -dichlorobenzene, and benzene.

2011年7月20日 · The crystal structure of poly (l -lactic acid) (PLLA) α form has been analyzed in detail by utilizing the 2-dimensional wide-angle X-ray (WAXD) and neutron diffraction (WAND) data measured for the ultradrawn sample.