Improvement of color value of bio-based polyamide 56 fibers

AbstractThis paper introduces a feasible method to improve the color value of bio-based polyamide 56 (PA56) fiber. Three types of whitening modifiers were introduced into the bio-based PA56 fibers by the in-situ polymerization method and melt blending method in order to improve the fiber color. The color values and mechanical properties of PA56 fibers were tested and analyzed and the optimum additive ratio and process conditions were discussed. The results show that the improved color value of bio-based PA56 fibers can be achieved by the melt blending method of fluorescent whitening masterbatch and reasonable spinning condition control. When the additive amount of fluorescent whitening agent is 0.3%, the index of lightness (L) increased from 84 to 90, while the yellow index (YI) reduced from 16.8 to 12.6. Moreover, PA56 fibers show high breaking strength about 4.27 cN/dtex and good yellowing resistance and durability.

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Investigation of in situ prepared polypropylene/clay nanocomposites properties and comparing to melt blending method

Materials & Design (1980-2015) ◽

10.1016/j.matdes.2009.07.014 ◽

2010 ◽

Vol 31 (1) ◽

pp. 76-84 ◽

Cited By ~ 89

Author(s):

H. Baniasadi ◽

A. Ramazani S.A. ◽

S. Javan Nikkhah

Keyword(s):

Clay Nanocomposites ◽

Melt Blending ◽

Blending Method

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Highly exfoliated montmorillonite clay reinforced thermoplastic polyurethane elastomer:in situpreparation and efficient strengthening

RSC Advances ◽

10.1039/c8ra10121c ◽

2019 ◽

Vol 9 (15) ◽

pp. 8184-8196 ◽

Cited By ~ 7

Author(s):

Jingshui Xu ◽

Lihua Cheng ◽

Zhong Zhang ◽

Ling Zhang ◽

Cen Xiong ◽

...

Keyword(s):

Thermoplastic Polyurethane ◽

Montmorillonite Clay ◽

Solution Polymerization ◽

Polyurethane Elastomers ◽

Thermoplastic Polyurethane Elastomers ◽

Mmt Clay ◽

Polymerization Method

Highly exfoliated montmorillonite (MMT) clay reinforced thermoplastic polyurethane elastomers (TPUs) were prepared by anin situsolution polymerization method.

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Mechanical, Thermal, and Morphological Properties of Thermoplastic Starch/Poly(lactic acid/Poly(butylene adipate-co-terephthalate) Blends

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.970.312 ◽

2014 ◽

Vol 970 ◽

pp. 312-316

Author(s):

Sujaree Tachaphiboonsap ◽

Kasama Jarukumjorn

Keyword(s):

Lactic Acid ◽

Impact Strength ◽

Interfacial Adhesion ◽

Tensile Modulus ◽

Thermoplastic Starch ◽

Morphological Properties ◽

Poly Lactic Acid ◽

Melt Blending ◽

Elongation At Break ◽

Blending Method

Thermoplastic starch (TPS)/poly (lactic acid) (PLA) blend and thermoplastic starch (TPS)/poly (lactic acid) (PLA)/poly (butylene adipate-co-terephthalate) (PBAT) blend were prepared by melt blending method. PLA grafted with maleic anhydride (PLA-g-MA) was used as a compatibilizer to improve the compatibility of the blends. As TPS was incorporated into PLA, elongation at break was increased while tensile strength, tensile modulus, and impact strength were decreased. Tensile properties and impact properties of TPS/PLA blend were improved with adding PLA-g-MA indicating the enhancement of interfacial adhesion between PLA and TPS. With increasing PBAT content, elongation at break and impact strength of TPS/PLA blends were improved. The addition of TPS decreased glass transition temperature (Tg), crystallization temperature (Tc), and melting temperature (Tm) of PLA. Tgand Tcof TPS/PLA blend were decreased by incorporating PLA-g-MA. However, the presence of PBAT reduced Tcof TPS/PLA blend. Thermal properties of TPS/PLA/PBAT blends did not change with increasing PBAT content. SEM micrographs revealed that the compatibilized TPS/PLA blends exhibited finer morphology when compared to the uncompatibilized TPS/PLA blend.

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Synthesis and Characterizations of Poly(Butylene Succinate) Copolyester

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1015.381 ◽

2014 ◽

Vol 1015 ◽

pp. 381-384

Author(s):

Li Liu ◽

Li Hai Cai ◽

Dan Liu ◽

Jun Xu ◽

Bao Hua Guo

Keyword(s):

Mechanical Properties ◽

Polymer Matrix ◽

Crystallization Temperature ◽

In Situ Polymerization ◽

Nucleating Agent ◽

Single Fiber ◽

Butylene Succinate ◽

Crystallization Behaviors ◽

Polymerization Method

The poly (butylene succinate) (PBS) and 3 wt% attapulgite (ATP) reinforced PBS/ATP nanocomposites with 1,6-hexanediol were fabricated using an in situ polymerization method. The crystallization behaviors indicated that ATP had effectively acted as nucleating agent, resulting in the enhancement on the crystallization temperature. The SEM results showed a superior interfacial linkage between ATP and PBS. Also, ATP could disperse as a single fiber and embed in the polymer matrix, which resulted in the improved mechanical properties.

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Thermal Stability and Crystallization Behavior of PP/Organoclay Phase Change Composites

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.785-786.123 ◽

2013 ◽

Vol 785-786 ◽

pp. 123-126

Author(s):

Ying Ye ◽

Kun Yan Wang ◽

Ge Chang ◽

Qian Ying Jiang

Keyword(s):

Thermal Stability ◽

Phase Change ◽

Crystallization Behavior ◽

Melt Blending ◽

X Ray Diffraction ◽

Nucleation Agent ◽

Scanning Calorimetry ◽

Blending Method ◽

Phase Change Composites ◽

Change Material

Polypropylene/organoclay modified by dodecanol phase change material were prepared by melt blending method. The thermal stability and crystallization behavior was studied by thermogravimetry (TG), differential scanning calorimetry (DSC), and X-ray diffraction (XRD). TG results indicated the window of processing of PP could be improved by adding small amount organoclay modified by dodecanol to the blend. DSC showed the organoclay modified by dodecanol affected the crystallization behavior of PP as heterogeneous nucleation agent. XRD results show that the organoclay modified by dodecanol does not change the crystal structure in the blends but only decrease the intensity of the diffraction peak.

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In situ ATR - FTIR spectroscopy of Hf(IV) tert butoxide adsorption on Si and Ge

MRS Proceedings ◽

10.1557/proc-0917-e09-03 ◽

2006 ◽

Vol 917 ◽

Author(s):

Shilpa Dubey ◽

Keijing Li ◽

Harish Bhandari ◽

Zheng Hu ◽

C. Heath Turner ◽

...

Keyword(s):

Hafnium Oxide ◽

Density Functional ◽

Substrate Surface ◽

Surface Concentration ◽

Bidentate Ligand ◽

Initial Reaction ◽

Process Conditions ◽

Reaction Cell

AbstractHafnium oxide ultra thin films on Si (100) are being developed to replace thermally grown SiO2 gates in CMOS devices. In this work, a specially designed Attenuated Total Reflectance - Fourier Transform Infra Red Spectroscopy (ATR-FTIR) reaction cell has been developed to observe chemisorption of hafnium (IV) t-butoxide onto a Si and Ge ATR crystal heated up to 250°C and under 1 torr of vacuum to observe the initial reaction pathways and species on the substrate surface in real time and under typical process conditions. Chemisorption spectra were compared to spectra of the liquid precursor and to spectra generated by density functional theory (DFT) calculations of liquid, monodentate and bidentate absorbed precursor. An asymmetric stretching mode located at ~1017 cm-1 present in the chemisorbed spectra but not in the liquid spectra indicates that the adsorbed hafnium containing group is prevalent as a bidentate ligand according to calculations. Surface concentration of the chemisorbed species was dependant on the substrate temperature and precursor partial pressure allowing for determination of heats of adsorption which was 26.5 kJ/mol on Si.

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Oberflächenkonditionierung beim Tiefbohren – Teil 2/Surface conditioning during deep drilling

wt Werkstattstechnik online ◽

10.37544/1436-4980-2021-03-26 ◽

2021 ◽

Vol 111 (03) ◽

pp. 118-123

Author(s):

Andreas Zabel ◽

Simon Strodick ◽

Robert Schmidt ◽

Frank Walther ◽

Dirk Biermann ◽

...

Keyword(s):

Sensor Technology ◽

Hole Drilling ◽

Process Conditions ◽

Deep Hole ◽

Process Data ◽

Deep Drilling ◽

Deep Hole Drilling ◽

Surface Conditioning ◽

Simulation Based

Der Beitrag befasst sich mit Teilaspekten bei der Entwicklung von Methoden zur gezielten, bearbeitungsparallelen Oberflächenkonditionierung beim Tiefbohren. Konkret handelt es sich um messtechnische und simulationsbasierte Ansätze zur Identifikation von thermomechanischen Prozesszuständen beim BTA- und ELB-Verfahren. Hierbei werden Möglichkeiten zur Gewinnung von Prozessdaten sowohl mit einer in-situ eingesetzten Sensorik als auch mit begleitend durchgeführten FEM-Simulationen betrachtet. Diese Daten bilden die Grundlage einer Prozessregelung für die beiden Tiefbohrverfahren. Im zweiten Teil werden nun die Arbeiten und Ergebnisse zum ELB-Tiefbohren behandelt.   The article deals with aspects of developing methods specifically for surface conditioning in deep hole drilling parallel to machining. This involves metrological and simulation-based approaches for identifying thermo-mechanical process conditions in both BTA and ELB process. Ways for obtaining process data both with sensor technology used in-situ and with FEM simulations performed concomitantly are investigated. These data form the basis of a deep hole process control. The second part presents the work and the results on single lip deep hole drilling.

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