A study on the distinguishing responses of shrinkage and warpage to processing conditions in injection molding

J of Applied Polymer Sci

2018

We studied the morphological, mechanical, and rheological properties of polycarbonate (PC) and poly(acrylonitrile-butadiene-styrene) (PolyABS) blends with different types of compatibilizer. Styrene-acrylonitrile-maleic anhydride terpolymer (SAM) was used as a compatibilizer of the blends. For comparison, styrene-acrylonitrile-glycidyl methacrylate terpolymer (SAG) was also used as a compatibilizer. For the PC-PolyABS (70/30 wt %) blends with SAM, the mechanical strength and complex viscosity reached a maximum when the SAM concentration was 5 phr. The mechanical and rheological results of the blend were consistent with the morphological result that the PolyABS domain size reached a minimum when the SAM content was 5 phr. The interfacial tension (a) of the blend was compared with the compatibilizer type and content, which were calculated by the Palierne emulsion model with the relaxation time of the PC-PolyABS blend. The a is consistent with the morphological and mechanical properties of the PC-PolyABS blend. The results of the morphological, mechanical, and rheological properties of the blend suggest that SAM was a more effective compatibilizer than SAG, and the optimum compatibilizer content of SAM was 5 phr. V C 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46418.

Section: Resultsmentioning

confidence: 99%

Relationship between the interfacial tension and compatibility of polycarbonate and poly(acrylonitrile–butadiene–styrene) blends with reactive compatibilizers

Ryu

J of Applied Polymer Sci

2018

Materials and Manufacturing Processes

“…The authors organized different sources for depicting a diagram that considered factors that affect shrinkage and warpage. Experimental evidences [10] shown that these two phenomenon were affected by different factors, even if warpage (defined as differential shrinkage) was generated by shrinkages. As consequence, a more focused structure respect to the scheme reported by Stan et al [9] was required for considering only factors that affected shrinkage.…”

Section: Structure Of Reviewmentioning

confidence: 97%

“…Studies that adopted Taguchi approach [10,50,55,63,64] or different methods [49,53,58,59,[65][66][67][68] identified this parameter as strongly critical. Shrinkage starts as soon as melted polymer fills the cavity mold and was critically influenced by holding pressure [33,69].…”

Section: Processing Parameter Influencesmentioning

confidence: 99%

Review of Factors that Affect Shrinkage of Molded Part in Injection Molding

Annicchiarico¹,

Alcock²

2014

123

Purpose: This paper reviews the factors affecting shrinkage of molded parts in injection molding. Methods: A selective screening of the papers published in the last 10 years was adopted. The review was organized according to molding scale (macro or micro) and by considering four branches of influence: material behaviors, processing parameters, mold, and specimen design. Results: Within the interval of confidence, at the macroscale, critical processing parameters were the temperatures, the packing parameters, cooling time, and injection speed; temperatures and packing parameters resulted critical factors at the microscale as well. Concerning the design aspects, the runner size and the ribs affect shrinkage at the macro and microscale, respectively. The analysis of the literature review has shown an absence of statistical approach for determining the material influences, a lack of information on shrinkage occur in powder-molded parts and the absence of data in specimen with dimensions below 10 m. Conclusions: The review collected the factors that affect shrinkage in injection molding, and identified three possible areas for further works.

“…Figure shows the size distribution of PBT/PolyASA blend with the addition of EGMA‐ g ‐SAN content. Figure was obtained from the analysis of variance technique, which is one of the widely used methods for data analysis . It is evident in Figure that the PBT/PolyASA blend with EGMA‐ g ‐SAN (3 phr) has the smallest domain size and narrowest size distribution.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 2 was obtained from the analysis of variance technique, which is one of the widely used methods for data analysis. 18,36 It is evident in Figure 2 that the PBT/PolyASA blend with EGMA-g-SAN (3 phr) has the smallest domain size and narrowest size distribution. The above morphological results suggest that the EGMA-g-SAN acts as a good compatibilizer in the PBT/PolyASA (70/30) blend, especially when the EGMA-g-SAN content is 3 phr.…”

Section: Resultsmentioning

confidence: 99%

Weathering properties and hydrolysis of poly(butylene terephthalate)/poly(acrylonitrile‐co‐styrene‐co‐acrylate) blend with reactive compatibilizer

Kwon

J of Applied Polymer Sci

2018

The effects of compatibilizer on the weathering properties and hydrolysis of the poly(butylene terephthalate) (PBT)/poly(acrylonitrile‐styrene‐acrylate) (PolyASA) blend (70/30 wt %) were investigated. Poly(ethylene‐co‐glycidylmethacrylate‐g‐styrene‐co‐acrylonitrile) (EGMA‐g‐SAN) was used as a compatibilizer of the blend. When the EGMA‐g‐SAN content was 3 phr, the impact and tensile strengths of the PBT/PolyASA blend showed maximum; as the EGMA‐g‐SAN content was increased from 0 to 3 phr, the impact strength of the blend increased from 6.1 to 9.5 kJ m−2. The rheological results showed that when the EGMA‐g‐SAN was 3 phr, the storage modulus and complex viscosity of the blend also showed maximum value. The mechanical and rheological results of the blend were consistent with the morphological result that when the EGMA‐g‐SAN was 3 phr, PolyASA domain size of the blend showed minimum. The weathering results showed that when the EGMA‐g‐SAN content was 3 phr, the gloss value of weathered surface of the blend showed maximum. After hydrolysis test, when the EGMA‐g‐SAN content was 3 phr, the impact and tensile strengths of the blend showed maximum. The mechanical, rheological, and weathering results suggested that EGMA‐g‐SAN is an effective compatibilizer in the PBT/PolyASA blend, and the optimum compatibilizer content is 3 phr. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47197.