Citation: ZHANG Guangchun, QIU Jian, XING Haiping, TANG Tao. Influence of Polyethylene-g-polystyrene on the Mechanical Properties and Foaming Behavior of Linear Low Density Polyethylene/Polystyrene Blends[J]. Chinese Journal of Applied Chemistry, ;2016, 33(7): 756-765. doi: 10.11944/j.issn.1000-0518.2016.07.160155 shu

Influence of Polyethylene-g-polystyrene on the Mechanical Properties and Foaming Behavior of Linear Low Density Polyethylene/Polystyrene Blends

ZHANG Guangchun ^a,b ,
QIU Jian ^a ,
XING Haiping ^a,, ,
TANG Tao ^a,,

a.
a. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;
b.
b. University of Chinese Academy of Sciences, Beijing 100049, China

Corresponding author: XING Haiping, TANG Tao,
Received Date: 12 April 2016
Available Online: 17 May 2016
Fund Project:

Polyethylene-g-polystyrene(PE-g-PS) copolymers, which were synthesized by the combination of ring-opening metathesis polymerization(ROMP), hydrogenation and atom transfer radical polymerization(ATRP) method, were utilized to compatibilize linear low density polyethylene/polystyrene(LLDPE/PS) blends. Using the LLDPE/PS blend in mass ratio of 70:30 as example, the effect of introduction of PE-g-PS on the mechanical properties was investigated. Compared to binary blends, elongation at break, tensile strength and yield strength are improved when the PE-g-PS is introduced. Utilizing PE-g-PS_0.34k(the subscript 0.34k represents a relative molecular mass of PS is 340) and PE-g-PS_1.59k as compatibilizers, the influence of PS branch length on foaming behavior of LLDPE/PS blends was investigated in a batch foaming process with supercritical carbon dioxide as physical foaming agent. Compared to the case containing PE-g-PS_0.34k, the cellular structure of the foamed blends becomes much more uniform and no large gap appeares with the addition of PE-g-PS_1.59k. When the foaming temperature is lowered to 80 ℃, confined effect of LLDPE solid around exists, much more uniform cellular structure also appears as PE-g-PS_1.59k is introduced.
- linear low density polyethylene/polystyrene blends,
- compatibilizer,
- mechanical properties,
- batch foaming,
- branch length
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