A new promising nucleating agent for polymer foaming: effects of hollow molecular-sieve particles on polypropylene supercritical CO2 microcellular foaming

Stereocomplexation is one of several approaches for improving polylactide (PLA) properties. The high molecular weight of poly L-lactide (PLLA) and poly D-lactide (PDLA) homopolymers are a constraint during the formation of stereocomplex PLAs (s-PLAs). The presence of s-PLA particles in PLA PLLA/PDLA blends can initiate the formation of s-PLA crystalline structures. We used the solution casting method to study the utilization of s-PLA materials from high molecular weight PLLA/PDLA blends for increasing s-PLA formation. The s-PLA particles initiated the formation of high molecular weight PLLA/PDLA blends, obtaining 49.13% s-PLA and 44.34% of the total crystalline fraction. In addition, the mechanical properties were enhanced through s-PLA crystalline formation and the increasing of total crystallinity of the PLLA/PDLA blends. The s-PLA particles supported initiation for s-PLA formation and acted as a nucleating agent for PLA homopolymers. These unique characteristics of s-PLA particles show potential to overcome the molecular weight limitation for stereocomplexation of PLLA/PDLA blends.

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Unusual Tuning of Mechanical Properties of Isotactic Polypropylene Using Counteraction of Shear Flow and β-Nucleating Agent on β-Form Nucleation

Macromolecules ◽

10.1021/ma900411f ◽

2009 ◽

Vol 42 (12) ◽

pp. 4343-4348 ◽

Cited By ~ 169

Author(s):

Yan-Hui Chen ◽

Gan-Ji Zhong ◽

Yan Wang ◽

Zhong-Ming Li ◽

Liangbin Li

Keyword(s):

Mechanical Properties ◽

Shear Flow ◽

Isotactic Polypropylene ◽

Nucleating Agent

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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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Hydro-mechanical properties of a low-clay shale with supercritical CO2 imbibition

Geomechanics and Geophysics for Geo-Energy and Geo-Resources ◽

10.1007/s40948-020-00200-x ◽

2020 ◽

Vol 6 (4) ◽

Author(s):

Qiao Lyu ◽

Kaixi Wang ◽

W. A. M. Wanniarachchi ◽

Chenger Hu ◽

Jindong Shi

Keyword(s):

Mechanical Properties ◽

Supercritical Co2 ◽

Clay Shale

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Effect of annealing on mechanical properties of nickel electrodeposited using supercritical CO2 emulsion evaluated by micro-compression test

Microelectronic Engineering ◽

10.1016/j.mee.2016.02.017 ◽

2016 ◽

Vol 153 ◽

pp. 101-104 ◽

Cited By ~ 2

Author(s):

Takashi Nagoshi ◽

Tso-Fu Mark Chang ◽

Tatsuo Sato ◽

Masato Sone

Keyword(s):

Mechanical Properties ◽

Compression Test ◽

Supercritical Co2

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Evolution of double crystal melting peak in polypropylene foam assisted by β-nucleating agent and supercritical CO2

Journal of Applied Polymer Science ◽

10.1002/app.46007 ◽

2017 ◽

Vol 135 (12) ◽

pp. 46007 ◽

Cited By ~ 7

Author(s):

Kesong Yu ◽

Hanchuan Jiang ◽

Hongfu Zhou ◽

Jianguo Mi ◽

Yadong He ◽

...

Keyword(s):

Supercritical Co2 ◽

Nucleating Agent ◽

Melting Peak ◽

Double Crystal ◽

Crystal Melting ◽

Polypropylene Foam

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Effect of MWCNT on Thermal, Mechanical, and Morphological Properties of Polybutylene Terephthalate/Polycarbonate Blends

Journal of Polymers ◽

10.1155/2014/157137 ◽

2014 ◽

Vol 2014 ◽

pp. 1-7 ◽

Cited By ~ 5

Author(s):

C. P. Rejisha ◽

S. Soundararajan ◽

N. Sivapatham ◽

K. Palanivelu

Keyword(s):

Mechanical Properties ◽

High Performance ◽

Flexural Modulus ◽

Tensile Modulus ◽

Nucleating Agent ◽

Mechanical Analysis ◽

Morphological Properties ◽

Multiwall Carbon Nanotube ◽

Polybutylene Terephthalate ◽

The Impact

This paper evaluated the effect of multiwall carbon nanotube (MWCNT) on the properties of PBT/PC blends. The nanocomposites were obtained by melt blending MWCNT in the weight percentages 0.15, 0.3, and 0.45 wt% with PBT/PC blends in a high performance corotating twin screw extruder. Samples were characterized by tensile testing, dynamic mechanical analysis, thermal analysis, scanning electron microscopy, and X-ray diffraction. Concentrations of PBT and PC are optimized as 80 : 20 based on mechanical properties. A small amount of MWCNT shows better increase in the thermal and mechanical properties of the blends of PBT/PC nanocomposite when compared to nanoclays or inorganic fillers. The ultimate tensile strength of the nanocomposites increased from 54 MPa to 85 MPa with addition of MWCNT up to 0.3% and then decreased.The tensile modulus values were increased to about 60% and the flexural modulus was more than about 80%. The impact strength was also improved with 20% PC to about 60% and with 0.15% MWCNT to about 50%. The HDT also improved from 127°C to 205°C. It can be seen from XRD result that the crystallinity of PBT is less affected by incorporating MWCNT. The crystallizing temperature was increased and the MWCNT may act as a strong nucleating agent.

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