Influence of molecular architecture and melt rheological characteristic on the optical properties of LDPE blown films

TY - JOUR

T1 - Influence of molecular architecture and melt rheological characteristic on the optical properties of LDPE blown films

AU - Zhu, Haijin

AU - Wang, Yanfang

AU - Zhang, Xiuqin

AU - Su, Yifan

AU - Dong, Xia

AU - Chen, Qingkui

AU - Zhao, Ying

AU - Geng, Cun

AU - Zhu, Shannong

AU - Han, Charles C.

AU - Wang, Dujin

N1 - Funding Information: This work was supported by the NSFC-SinoPec Joint Project.

PY - 2007/8/10

Y1 - 2007/8/10

N2 - A systematic investigation on the origin of the haze of LDPE blown films was conducted, aiming to correlate the film haze with the molecular architecture and melt rheological properties. First of all, the haze measurement indicated that the surface haze, rather than the bulk haze, is the dominating factor for the total haze of the investigated films. No spherulitic crystals or other superstructures were observed for the LDPE blown films, implying that the crystallites formed in the film-blowing process are too small to be responsible for the optical haze. Rheological study revealed that the surface roughness was originated from the irregular flow of LDPE melt during the extrusion process. NMR, GPC and parallel-plate rheology were applied to study the molecular architecture of the LDPE resins. It was found that the LDPE sample with higher haze value exhibits distinctly larger portion of higher molecular weight component, broader molar mass distribution, significantly higher side chain branch density.

AB - A systematic investigation on the origin of the haze of LDPE blown films was conducted, aiming to correlate the film haze with the molecular architecture and melt rheological properties. First of all, the haze measurement indicated that the surface haze, rather than the bulk haze, is the dominating factor for the total haze of the investigated films. No spherulitic crystals or other superstructures were observed for the LDPE blown films, implying that the crystallites formed in the film-blowing process are too small to be responsible for the optical haze. Rheological study revealed that the surface roughness was originated from the irregular flow of LDPE melt during the extrusion process. NMR, GPC and parallel-plate rheology were applied to study the molecular architecture of the LDPE resins. It was found that the LDPE sample with higher haze value exhibits distinctly larger portion of higher molecular weight component, broader molar mass distribution, significantly higher side chain branch density.

KW - Haze

KW - Low-density polyethylene (LDPE)

KW - Rheology

UR - http://www.scopus.com/inward/record.url?scp=34547596219&partnerID=8YFLogxK

U2 - 10.1016/j.polymer.2007.06.044

DO - 10.1016/j.polymer.2007.06.044

M3 - 文章

AN - SCOPUS:34547596219

SN - 0032-3861

VL - 48

SP - 5098

EP - 5106

JO - Polymer

JF - Polymer

IS - 17

ER -