Evaluation of the Crystallization of Polypropylene at Melt Spinning Conditions Using the Green Chemical Orotic Acid as Nucleating Agent

2018 ◽  
Vol 3 (1) ◽  
Author(s):  
Vogel R
Keyword(s):  
Melt Spinning ◽  
Orotic Acid ◽  
Nucleating Agent

Construction of polypropylene composite multifilaments filled with sodium perborate trihydrate-treated jute microparticles

2017 ◽  
Vol 24 (2) ◽  
pp. 203-212 ◽  
Author(s):  
Yasemin Seki ◽  
Aysun Akşit ◽  
Umit Halis Erdoğan
Keyword(s):  
Photoelectron Spectroscopy ◽  
Textile Industry ◽  
Melt Spinning ◽  
Moisture Absorption ◽  
Nucleating Agent ◽  
Sodium Perborate ◽  
Polypropylene Composite ◽  
Scanning Calorimetry ◽  
Vertical Wicking ◽  
Potential Applications

AbstractPolypropylene composite multifilaments filled with surface-treated jute microparticles were successfully spun by melt spinning. To enhance the particle distribution, jute particleos were treated with 5–20% (w/v) aqueous solutions of sodium perborate trihydrate (SP). X-ray photoelectron spectroscopy (XPS) was used to confirm the surface treatment. XPS analysis indicated that the treatments improved the hydrophobicity of the jute by means of increasing the carbon/oxygen ratio of the surface; thus, the maximum increment was achieved after 10% (w/v) SP treatment. After determining the optimum SP concentration, the spinning of polypropylene composite multifilaments containing 0.3–1.4 wt% jute particles was employed. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) revealed the nucleating agent effect of the particles during crystallization in the filaments. The addition of fillers did not result in significant changes in the functional groups of polypropylene. The main output of this research is that polypropylene multifilaments incorporating 1.4 wt% jute particles presented the highest moisture absorption and hydrophilic character as determined by TGA, moisture content, and vertical wicking tests. It was concluded that particle content >0.3 wt% showed a tendency to agglomerate in the filament. Consequently, this study provided a new polypropylene filament having moisture absorbability performance, which can create potential applications in the textile industry.

Effect of orotic acid as a nucleating agent on the crystallization of bacterial poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) copolymers

2009 ◽  
Vol 114 (2) ◽  
pp. 1287-1294 ◽  
Author(s):  
Nicolas Jacquel ◽  
Koichirou Tajima ◽  
Nobuo Nakamura ◽  
Toshio Miyagawa ◽  
Pengju Pan ◽  
...  
Keyword(s):  
Orotic Acid ◽  
Nucleating Agent

Study on thermal and mechanical behaviors of polypropylene grade 552R/Cloisite 15A nanocomposites suitable for yarn applications

2021 ◽  
pp. 096739112110034
Author(s):  
Ali Farahani ◽  
Arsalan Parvareh ◽  
Mostafa Keshavarz Moraveji ◽  
Davood Soudbar
Keyword(s):  
Melt Spinning ◽  
Oxygen Index ◽  
Layer Structure ◽  
Tensile Modulus ◽  
Barrier Properties ◽  
Nucleating Agent ◽  
Clay Nanocomposites ◽  
Melt Mixing ◽  
Limiting Oxygen Index ◽  
Mixing Method

The investigation of polypropylene (PP)/clay nanocomposites has received considerable scientific and technological attention during the last decades due to their good mechanical and barrier properties. In the present article, the effects of adding Cloisite15A (C15A) nanoclay in polypropylene (PP) were investigated. PP nanocomposites were prepared by a direct melt mixing method. For better dispersion of C15A, 30 wt% of nanoclay masterbatch was first prepared by melt mixing of PP matrix and acrylic acid grafted PP oligomer (PP- g-AA) in a compounder, before being used to produce nanocomposites with 2 and 5 wt% of C15A. The aim of this work was to used nanoclay filled nanocomposites with suitable properties for cable application like good flame-retardant property; improve dye-ability and resilience of polypropylene. The XRD results indicated an intercalated layer structure for nanocomposites, The SEM examination showed satisfactory dispersion of nanoclay in 2 wt% of C15A and some degree of agglomeration in 5 wt% of C15A. DSC analysis indicated that C15A acts as a nucleating agent and increases crystallinity in the nanocomposite. TGA showed with increasing nanoclay, heat resistance was improved and degradation temperatures increased. Limiting oxygen index (LOI) tests showed increased flame retardancy from 25% for neat polypropylene t0 32.2% for nanocomposites of 5 wt% of C15A. The tensile modulus was improved from 423 MPa for neat polypropylene to 474 MPa for nanocomposites with 5 wt% of C15A. This result indicates that increasing C15A content had a suitable effect on the tensile properties. Melt spinning investigation on low oriented yarn (LOY), draw textured yarn (DTY), and fully drawn yarn (FDY) of 2 wt% C15A nanocomposite showed a reduction of linear density for FDY and an increase of the shrinkage. Furthermore, the obtained results for the improvement of dye-ability and compression resilience showed that PP/C15A is appropriate for textile products.

Crystallization behavior and polymorphism of poly(1,4-butylene adipate): Effect of anhydrous orotic acid as nucleating agent

2015 ◽  
Vol 133 (5) ◽  
pp. n/a-n/a ◽  
Author(s):  
Jinjun Yang ◽  
Yichun Chen ◽  
Lei Hua ◽  
Rong Liang ◽  
Dianxing Zhu
Keyword(s):  
Orotic Acid ◽  
Crystallization Behavior ◽  
Nucleating Agent

Properties of polypropylene fibers using the green chemical orotic acid as nucleating agent

2015 ◽  
Vol 4 (4) ◽  
pp. 207-214
Author(s):  
Roland Vogel ◽  
Harald Brunig ◽  
Liane Haussler
Keyword(s):  
Orotic Acid ◽  
Nucleating Agent ◽  
Polypropylene Fibers

scholarly journals Insight into the role of bound water of a nucleating agent in polymer nucleation: a comparative study of anhydrous and monohydrated orotic acid on crystallization of poly(l-lactic acid)

RSC Advances ◽  
2017 ◽  
Vol 7 (44) ◽  
pp. 27150-27161 ◽  
Author(s):  
Ping Song ◽  
Lin Sang ◽  
Liuchun Zheng ◽  
Chao Wang ◽  
Kankan Liu ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Comparative Study ◽  
Orotic Acid ◽  
Bound Water ◽  
Nucleating Agent ◽  
Negative Role ◽  
Insight Into

The bound water of orotic acid and its dehydration transition play a negative role in nucleation effects on PLLA crystallization.

Nucleation mechanism of polyhydroxybutyrate and poly(hydroxybutyrate-co-hydroxyhexanoate) crystallized by orotic acid as a nucleating agent

2010 ◽  
Vol 115 (2) ◽  
pp. 709-715 ◽  
Author(s):  
Nicolas Jacquel ◽  
Koichirou Tajima ◽  
Nobuo Nakamura ◽  
Hideo Kawachi ◽  
Pengju Pan ◽  
...  
Keyword(s):  
Orotic Acid ◽  
Nucleating Agent ◽  
Nucleation Mechanism

EM of rapidly solidified permanent magnets

1992 ◽  
Vol 50 (1) ◽  
pp. 198-199
Author(s):  
Raja K. Mishra
Keyword(s):  
Melt Spinning ◽  
Permanent Magnets ◽  
Dark Field Image ◽  
Dark Field ◽  
Maximum Energy ◽  
Quench Rate ◽  
Maximum Energy Product ◽  
Energy Product ◽  
Annular Dark Field ◽  
Rapidly Solidified

The discovery of a new class of permanent magnets based on Nd2Fe14B phase in the last decade has led to intense research and development efforts aimed at commercial exploitation of the new alloy. The material can be prepared either by rapid solidification or by powder metallurgy techniques and the resulting microstructures are very different. This paper details the microstructure of Nd-Fe-B magnets produced by melt-spinning.In melt spinning, quench rate can be varied easily by changing the rate of rotation of the quench wheel. There is an optimum quench rate when the material shows maximum magnetic hardening. For faster or slower quench rates, both coercivity and maximum energy product of the material fall off. These results can be directly related to the changes in the microstructure of the melt-spun ribbon as a function of quench rate. Figure 1 shows the microstructure of (a) an overquenched and (b) an optimally quenched ribbon. In Fig. 1(a), the material is nearly amorphous, with small nuclei of Nd2Fe14B grains visible and in Fig. 1(b) the microstructure consists of equiaxed Nd2Fe14B grains surrounded by a thin noncrystalline Nd-rich phase. Fig. 1(c) shows an annular dark field image of the intergranular phase. Nd enrichment in this phase is shown in the EDX spectra in Fig. 2.

In situ TEM observations of melting in nanosized eutectic Pb-Cd inclusions embedded in Al

1996 ◽  
Vol 54 ◽  
pp. 986-987
Author(s):  
S. Hagège ◽  
U. Dahmen ◽  
E. Johnson ◽  
A. Johansen ◽  
V.S. Tuboltsev
Keyword(s):  
Electron Microscope ◽  
Melt Spinning ◽  
Ternary Alloys ◽  
Solid Matrix ◽  
Eutectic System ◽  
In Situ Tem ◽  
In Situ Observation ◽  
Orientation Relationships ◽  
Transmission Electron

Small particles of a low-melting phase embedded in a solid matrix with a higher melting point offer the possibility of studying the mechanisms of melting and solidification directly by in-situ observation in a transmission electron microscope. Previous studies of Pb, Cd and other low-melting inclusions embedded in an Al matrix have shown well-defined orientation relationships, strongly faceted shapes, and an unusual size-dependent superheating before melting.[e.g. 1,2].In the present study we have examined the shapes and thermal behavior of eutectic Pb-Cd inclusions in Al. Pb and Cd form a simple eutectic system with each other, but both elements are insoluble in solid Al. Ternary alloys of Al (Pb,Cd) were prepared from high purity elements by melt spinning or by sequential ion implantation of the two alloying additions to achieve a total alloying addition of up to lat%. TEM observations were made using a heating stage in a 200kV electron microscope equipped with a video system for recording dynamic behavior.

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