Reactive processing of polyethylene: effect of peroxide-induced graft copolymerization of some acrylic monomers on polymer structure melt rheology and relaxation behavior

ABSTRACT:The chain structure, spherulite morphology, and rheological property of LL-DPE-g-AA were studied by using electronspray mass spectroscopy, 13 C-NMR, and rheometer. Experimental evidence proved that AA monomers grafted onto the LLDPE backbone formed multiunit AA branch chains. It was found that AA branch chains could hinder movement of the LLDPE main chain during crystallization. Spherulites of LLDPE became more anomalous because of the presence of AA branch chains. Rheological behavior showed that AA branch chains could act as an inner plasticizer at the temperature range of 170-200°C, which made LLDPE-g-AA easy to further process.

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Morphology, structure, and rheological property of linear low‐density polyethylene grafted with acrylic acid

Huang

Yao

Yang

et al. 2001

“…The results mentioned earlier cannot be explained by the low grafting percentage and may be attributed to the different structure of the grafting monomer. It is worth noting that the enhanced interaction between AA (or BA) grafted CB and LDPE seem to be resulted from the formation of long chain CB‐(AA) n or CB‐(BA) n grafted on LDPE induced by polymerization initiators or by the action of heat and shear 24, 25. On the contrary, no long chains were grafted on CB or LDPE in the case of MA; and therefore, there existed poor interaction between MA‐ g ‐CB and polymer matrix compared with AA(BA)‐ g ‐CB.…”

Section: Resultsmentioning

confidence: 99%

Dynamic viscoelasticity of low‐density polyethylene/in‐situ‐grafted carbon black composite

Zheng

Zhang³

et al. 2006

ABSTRACT:The study on the dynamic viscoelastic properties of grafted carbon black (g-CB) filled low-density polyethylene (LDPE) was carried out. Because of formation of CB networking, the characteristic modulus plateau and loss tangent arc appears. Addition of grafting monomer like butyl acrylate (BA) and acroleic acid (AA) enhances the interaction between particles and matrix due to accelerated formation of micronetworking in the composites induced by forming branch chains of AA and BA with multiunit. The decrease of the temperature corresponding to ␣ c mechanical relaxation together with AA (BA) addition given by the position of loss tangent (tan ␦) peak for LDPE is owed to the formation of long-chain polymer grafted between CB and the matrix, which facilitates the slip of the lamella of LDPE. The influence of maleic anhydride (MA) on enhancing interaction between LDPE and CB is not so pronounced, as compared with AA and BA because of no formation of long chain between CB particle and polymer matrix.

“…HDPE was purchased from Sabic (Saudi Arabia) (Product ID ¼ 80,064, density ¼ 0.95 g/cm 3 at 208C, and MFI ¼ 8.3g/10 min). MAH and toluene were from Shanghai Linfeng Chemical Reagent.…”

Section: Methodsmentioning

confidence: 99%

“…1 To overcome these shortcomings and broaden its usage in current areas, functionalization of PE has been widely pursued with various monomers for specific purposes. [1][2][3][4][5][6][7] As one of the most common ''star monomers'' to modify hydrocarbon substrates for its poor homopolymerization character toward free radicals, 8 the introduction of maleic anhydride (MAH) on the backbones of hydrocarbons can effectively improve their polarity and compatibility with other polar polymers, [9][10][11][12] and various kinds of PE grafting MAH copolymers have been obtained, e.g., LDPE-g-MAH, LLDPE-g-MAH, HDPE-g-MAH, etc. [13][14][15] through the traditional approaches including solution grafting method, 13,[15][16][17][18] melt-state grafting method, [19][20][21] and radiation grafting method.…”

Section: Introductionmentioning

confidence: 99%

Solvothermal preparation and characterization of maleic anhydride grafting high density polyethylene copolymer

Shen

Liu

et al. 2007

In this article, the grafting copolymerization of maleic anhydride (MAH) onto high density polyethylene (HDPE) was carried out through solvothermal process. Infrared spectra (IR) revealed that MAH had been successfully grafted onto the HDPE backbone. The influences of the reaction parameters on the grafting copolymerization, e.g., the concentration of the initiator, MAH and HDPE content, reaction time, reaction temperature, comonomer, and different solvents were also studied. Further studies found that MAH could be grafted onto HDPE in both good solvents and poor solvents, which was much different from the traditional solution grafting method.